Record physical observations about the ball in the table: is the ball stretchy? 20. A few other important vinyl monomers are listed below4. That produces closed-cell rigid insulation. When prepared from diamines and dicarboxylic acids, e.g. When applied as sheathing, EPS should be used over house wrap. Roughly 75% of the plastics used in this country can be categorized as one of six types, or The Big Six. Safety Figure 6.31. <> At the atomic level, styrene consists of carbon and hydrogen atoms held together by covalent bonds. The polymerization of styrene has been known since 1839, when the German pharmacist Eduard Simon reported its conversion into solid styrol, later renamed metastyrol. Partial support for this work was provided by the National Science Foundation's Division of Undergraduate Education through grants DUE #9950809 and DUE #9950296. (In isotactic polypropylene, all the methyl [CH3] groups are arranged along the same side of the polymer chain.) It affects the central nervous system, causing headaches, fatigue, and confusion. (Partly in recognition of this achievement, Natta was awarded the Nobel Prize for Chemistry in 1963 along with Ziegler.) 3. What is the composition of polystyrene? a lightweight bottle cap? Medical applications of crystal polystyrene include labware such as petri dishes and tissue culture trays. ABS polymers are used in a large variety of applications. Styrene, also known as phenylethylene, is obtained by reacting ethylene with benzene in the presence of aluminum chloride to yield ethylbenzene, which is then dehydrogenated to yield clear, liquid styrene. Based on your data in the table, which compound was most likely responsible for this? It is difficult to weld general purpose polystyrene due to its brittleness. HIPS does not warp but needs a heated build plate to allow 3D printing. Monomers are linked together in an addition polymerization reaction. fMX3LD8 ^ JmvgB,%Mog_>g*aJ2\%F)bIOCqC)ZpnW/4c^PjgKq/SNZ|g%JpIlg?L-}P"MDfd9u_g4nyu*h-% 7j>esI2&p!fZfgIWcg`[t7+]Q`[/l5J#5dbUT6]rsh;?/G[0aV-/(M S8AS70PLhM The word polymer derives its meaning from this, which means "many mers". stream (a) Property retention. WebPOLYMERIZATION & TYPES OF POLYSTYRENE Repeating Unit Irregular and Crystal ine Highly regular and crystalline . Polystyrene is used in different forms, including as foam, film, and rigid plastic, for applications from food packaging to electronics protection. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. {"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is the repeat unit molecular weight for polystyrene? It also has a relatively low glass transition temperature of 100C, where the polymer begins to soften before melting. For example, in polyethylene terephthalate (PET or "polyester"), the repeat unit is -CO-C6H4-CO-O-CH2-CH2-O-. From: Geosynthetics in Civil Engineering, 2007, DrAdrian Merrington, in Applied Plastics Engineering Handbook, 2011. Amongst the foam, there are two types - expanded polystyrene (EPS) and extruded polystyrene (XPS). When the polymer is formed, the C=C double bond in the monomer is replaced by a C-C single bond in the polymer repeat unit, which links by two new bonds to adjoining repeat units. Due to its high molecular weight, it does have a low melt flow index, which can lengthen the production cycle. This reaction eventually leads to the formation of polystyrene, a portion of which is shown below. Syndiotactic polystyrene (sPS) was first commercialized by Idemitsu Petrochemical Company, Ltd. of Japan and developed jointly with Dow in 1988. Most of these reactions can be placed in one of two classifications: chain-reaction polymerization and step-reaction polymerization. Crystal polystyrene resins are glassy and crystal clear and are most often supplied in the form of one-eighth-inch granules. Polystyrene (PS) is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum. Plastic Abbreviations and Salient Features | The Ultimate Guide, 6 Best Plastic Molding Techniques | A Complete Analysis, 7 Types of Plastics | An Helpful Illustrated Guide, Polycarbonate VS Acrylic | A Comprehensive Comparison, Top 10 Injection Molding Machine Manufacturers in China, What is UHMW Plastic Material? Effect of gamma radiation on polystyrene. Use the ruler and hold the ball at a height of 30 cm (=12 in) above the bench. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. However, because of its very low moisture absorption, limited dyeability, and low softening point (an important factor when ironing clothing), polypropylene is not an important apparel fibre. Polystyrene can be injection molded in both solid and foam form. Science. UNIT: VALUE / RANGE: PREFERRED: Molar Volume V m: mL mol-1: 59.7: Density : g mL-1: 0.89 0.93 - 0.97 (trans) 0.92 - 1.01 (cis) 0.89 0.95 0.96: Solubility Parameter : MPa 1/2: 14.7 - 18.6 14.6 - 17.6 (trans) 14.7 - 17.6 (cis) 17.0: Molar Cohesive Energy E coh: J mol-1: 12900 - 20700: 17300: Glass Transition Temperature T g: K: 166 - Obtain a wash bottle with distilled water. This is the lightweight material in which the voids filled with trapped air give expanded PS a low thermal conductivity. Why is it important to dislodge any adhering bubbles in the density tests? Polypropylene is rugged and unbreakable plastic making it more versatile and durable than polystyrene. Suggest a way to separate it commercially from other waste plastics. The condensation involves loss of water, as an H is lost from each HO- group in the glycol, and an OH from each HOOC- group in the acid. WebPolystyrene is an insulation material used in the construction industry. A repeat unit is sometimes called a mer (or mer unit). "Mer" originates from the Greek word meros, which means "a part". The word polymer derives its meaning from this, which means "many mers". A repeat unit (mer) is not to be confused with the term monomer, which refers to the small molecule from which a polymer is synthesized. WebThe basic repeating unit in polyethylene comes from ethane (CH2=CH2). HIPS is biodegradable and has a bright white color. This is because the HOMO/LUMO Solid polystyrene injection molding provides properties such as low shrinkage, which makes parts less prone to warpage. Polystyrene has a chain where the substituent R is a phenyl group (C6H5), corresponding to a benzene ring minus one hydrogen: -[CH2-CH(C6H5)]n-, so the repeat unit is -[CH2-CH(C6H5)]-. 9. Lets dive deep and know more. A repeat unit (mer) is not to be confused with the term monomer, which refers to the small molecule from which a polymer is synthesized.[5]. >> Allow the ingredients to interact for 10-15 seconds. It is a brittle material with poor UV resistance. David Whisnant(Wofford College). Because of its low gas barrier, it can be used for produce where a breathable film is required. endobj If the sample sinks, it has a density greater than that of the liquid. Polystyrene is transparent, thanks to its lack of crystallinity. Figure 5 shows some possible polymer structures. Co-polymerized polystyrene is injection molded as well to produce parts with improved mechanical properties. Polystyrene, being a thermoplastic is highly suitable and compatible with industrial techniques such as hot embossing and injection molding for the fabrication of microstructures (Mehta et al., 2009). The order and connectivity of a polymer backbone affect the fragmentation pattern that is observed. In the early 1900s, chemists began to replicate natural polymers, and create synthetic polymers, beginning with nylon which mimics silk in its strength and flexibility. The structure of the polymer repeating unit can be represented as: The presence of the pendant phenyl (C6H5) groups is key to the properties of polystyrene. Injection molded general purpose crystal grades are typically used in applications such as cutlery, drink cups, tumblers, medical and diagnostic labware, office accessories, and housewares. Filled symbols refer to polydicyanurates (N Nj ), anhydride cured phenyl monoglycidyl ether with a small fraction of bisphenol A diglyci-dylether as crosslinker (N=8Nj ) and end-functionalized 3-arm polystyrene stars crosslinked by diisocyanate (N 40 N ). Daniel J. Thomas, in 3D Printing in Medicine and Surgery, 2021. These have been used in the microfabrication of microbead arrays. Polystyrene, like all thermoplastics, is reusable and easily molded. 9-13/09/2014. For polystyrene, from Table 5, each repeat unit has eight carbons and eight hydrogens. Polystyrene can come in two formscrystal polystyrene and high impact polystyrene (HIPS). What is the repeat unit molecular weight for polystyrene? The term Styrofoam is often used to refer to expanded polystyrene. Please refer to our terms and conditions for more information. Its high flow and processing ease make it an excellent candidate for thin wall applications. The numbers are used to ease identification of the plastics, so that they can be separated for recycling. WebThe formula of the polystyrene repeating unit (II) is thus seen to be essentially the same as that of the monomer styrene CH2 =CH-C6H5. Its moldability and low shrinkage make polystyrene suitable for injection molding. Polystyrene prepared by free-radical polymerization is. Chemistry questions and answers. Plates and cups can be made from polystyrene, as can sound dampening foam and protective lamination over posters and other products. In this case the repeat unit has the same atoms as the monomer vinyl chloride CH2=CHCl. Polystyrenes can come in three different forms. This fatigue resistance has led to the design of polypropylene boxes and other containers with self-hinged covers. It is a transparent, rigid and a brittle polymer which is easy to process. Get Traffic & Exposure. "}},{"@type":"Question","name":"Is polystyrene the same as Styrofoam? 4. High impact grades of polystyrene are modified with polybutadiene elastomers. They both have different manufacturing processes. I'm given the structure, and I have to count all the elements in the structure. Expanded PS used to contain chloroflurocarbons but other, more environmentally safe, blowing agents are now used. UNIT: VALUE / RANGE: PREFERRED: Molar Volume V m: mL mol-1: 99.0 - 99.5: 99.2: Density : g mL-1: 1.05: 1.05: Solubility Parameter : MPa 1/2: 17.7 - 20.8: 18.3: As late as 1930 little commercial use was found for the polymer because of brittleness and crazing (minute cracking), which were caused by impurities that brought about cross-linking of the polymer chains. The medical field also uses this material in test tubes and Petri dishes. The material can be injection molded and extruded. The largest family of polymers 3, vinyl polymers, are produced by chain polymerization reactions. Kindly comment on your questions and reviews in the comment box. Styrene is the monomer for polystyrene, whereas propylene is for In condensation polymers (see examples below), the repeat unit contains fewer atoms than the monomer or monomers from which it is formed. Figure 38. You can find him on Facebook, Twitter and Instagram. Injection molded high-heat crystal grades are typically used in applications such as medical products, packaging, housewares, office accessories, and compact disc containers. xZ[s~@ The Big Six thermoplastics have these general attributes: The most common of the Big Six plastics is high-density polyethylene (HDPE). They both have different manufacturing processes. WebFor polystyrene, from Table 5.3, each repeat unit has eight carbons and eight hydrogens. Foamed polystyrene is made into insulation, packaging, and food containers such as beverage cups, egg cartons, and disposable plates and trays. WebPolymers can form a range of structures and possibly contain more than one type of repeat unit. Most synthetic fibers are condensation polymers. WebPolystyrene (PS) is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum. Routes to recycle solid PS include the basic wash, dry, and pelletize route described earlier but EPS typically requires a densification process to be applied. Polystyrene is used in applications from appliances to medical products to automotive parts. Is polystyrene really capable of high-end engineering applications? ","acceptedAnswer":{"@type":"Answer","text":"The three different types of polystyrene include polystyrene foam, polystyrene plastic, and polystyrene film. Chemists tend to consider the repeat unit as -[CH2-CH2]- since this polymer is made from the monomer ethylene (CH2=CH2). It is composed of repeating units of the monomer ethylene. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. The ball will start out sticky and messy, but will solidify as it is kneaded. A portion of the polymer polystyrene is More than half of all polystyrene produced is blended with 5 to 10 percent polybutadiene to reduce brittleness and improve impact strength. For example, polystyrene is combined with methyl methacrylate to form Poly (styrene-co-methyl methacrylate) or PSMMA. With its low cost, low density, clarity, dimensional stability, and adaptability to radiation sterilization, polystyrene possesses many attractive features for medical applications. [3] Autol - Calahorra Motorway (LR-282) Km 7,Calahorra (La Rioja) - info@torremaciel.com - +34 941163021 - +34 941163493. Styrene is the monomer for polystyrene, whereas propylene is for polypropylene. These include household piping, luggage, power tool housings, vacuum cleaner housings, toys and automotive components such as interior trim. Moreover, polystyrene is the base material for various co-polymerization processes to produce better plastics with unique properties. Ans. Polystyrene is manufactured through an extrusion process. also known as copolymers. Vinyl polymers are addition polymers, which have the same atoms as the monomer in their repeat units. Some PS is recycled (audio and video cassettes, jewel cases, etc. The National Polystyrene Recycling Company was a coventure between a number of PS-producing chemical companies intended to increase PS recycling but success was limited. Many of the applications for PS are single use and disposable. xko8{}m\c4SCE.A3rwX&l~\d'i90[7zpv{X>{*{==?awg"+3.GV3hd?:*_B*gE#;-> ^HAPWq^\[aiH}8xGHDtcb{`$2-6q,E+NAZ{jw4l`97>Ib5+q gBDI>H;5lPCVm 8.F4P4]OV{T0n7@i-Dk\|kgZ*E.ZFnQwT'}, tKoh} i8Q=M~nSbu*6d][mP`fam#V\1;Bded97|>,YL}^X2Z`vUcQw37vZ7{PouKYNfHSX%RJ@+f) Although EPS is acceptable for ground contact and can be treated to resist insects, it does absorb water. % Polystyrene, Polyethenylbenzene, Styrofoam, Styron, Fome-Cor, Luran, Lustrex. A polystyrene chain of N = 10,000 monomers has 2N C-C bonds. Place one piece of each plastic into each of the three test tubes. ","acceptedAnswer":{"@type":"Answer","text":"The material is recyclable but very expensive\nHarmful to environment\nSusceptible to UV degradation.\nWeak chemical resistance to organics.\nHigh flammability. Learns and shares consistently about plastics technologies. Table3.2. The temperature range at which polystyrene begins to soften and melt is relatively short, and the process must be carefully monitored and designed accordingly. Currently, more than 60,000 plastics are manufactured for industrial and commercial purposes. No materials used in this experiment should be ingested. % Which ball bounced the highest? Identify the samples by looking for the number/recycling symbol. In the 1980s, the US Environmental Protection Agency (EPA) was able to show that styrene was found in 100% of the samples of human fat taken from 48 states in the United States. Polypropylene is one of the most used plastics in the production of households, food containers, electronics parts, packaging, automotive components, and other industries. Both crystal polystyrene and HIPS find uses in respiratory care equipment, syringe hubs, and suction canisters. Effect of EtO sterilization on polystyrene. The content appearing on this webpage is for informational purposes only. Polystyrene is moderately resistant to higher molecular weight aliphatic alcohols, dilute aqueous acids and bases, and bleach. Each new monomer adds to one end with a covalent bond; the total number of monomers in the polymer is represented by the subscript, n. The resulting polymer is a chain of monomers linked together. Polystyrene is not autoclavable, but other methods of sterilization such as gamma radiation are employed. Polymer formation begins with one diacid molecule reacting with one dialcohol molecule to eliminate a water molecule and form an ester. <>>> Another industry that uses polystyrene is the automotive sector, which uses pure polystyrene for childrens protective seats and composites of this material for automotive bodies and components. The styrene monomer is polymerized using free-radical initiators primarily in bulk and suspension processes, although solution and emulsion methods are also employed. Other Styrene Polymers: Several other important classes of styrene polymers are also used. Containers, poultry trays, egg cartons, meat packaging, and foam packaging for CDs, and DVDs, top 10 injection molding machine manufacturers in china, Top 10 Plastic Injection Molding Companies In United States, Top 6 injection Molding Machine Manufacturers, Top 10 Injection Moulding Companies In UK 2022, Polystyrene Characteristics and Properties. Legal. Discover the reasons why Styrofoam (polystyrene) is not recycled as much as it could be. The compound is often called simply SBS or SBS rubber. It is also injection-molded into many products, such as appliance housings, dishwasher-proof food containers, toys, automobile battery casings, and outdoor furniture. Thus, m = 8(AC) + 8(AH) High impact polystyrene can be welded using techniques like ultrasonic and radio frequency welding. How many monomers are present? Polystyrene is also food safe, so its used in food service applications as rigid silverware and containers for food and drinks, as well as polystyrene film as part of meat and takeout packaging. By 1937 Robert Dreisbach and others at the Dow Chemical Companys physics laboratory purified the monomer and developed a pilot-plant process for the polymer, which by 1938 was being produced commercially. Polypropylene shares some of the properties of polyethylene, but it is stiffer, has a higher melting temperature, and is slightly more oxidation-sensitive. Low impact strength and medium to high tensile strength. Numerous industrial end uses exist for polypropylene fibre as well, including rope and cordage, disposable nonwoven fabrics for diapers and medical applications, and nonwoven fabrics for ground stabilization and reinforcement in construction and road paving. Also, the repeat unit molecular weight for ethylene is ms = 2(AC) + 4(AH) = 2(12.01 g/mol) + 4(1.008 g/mol) = 28.05 g/mol Weak resistance to oxygen, UV, and hydrocarbon solvents. PET plastic (number 1) is the most valuable waste plastic at the present time. Repeating units of polymers used in the manufacture of geosynthetics, Vinny R. Sastri, in Plastics in Medical Devices, 2010. (lowest) _______ _______ _______ _______ _______ _______ (highest). Injection molded articles include picnic cutlery, compact disc jewel boxes, audiocassette housings and toys. I'm having a hard time deterring where the additional H is coming from. WebPolymers are covalently bonded long chain molecules composed of repeating units, called monomers, comprised of carbon and hydrogen, and sometimes oxygen, nitrogen, sulfur, Few other important vinyl monomers are listed below4 Ziegler. 10,000 monomers has 2N C-C bonds in... Eight carbons and eight hydrogens, 2011: chain-reaction polymerization and step-reaction polymerization is it to. News, offers, and bleach is coming from is shown below highest ), vacuum cleaner housings vacuum! Versatile and durable than polystyrene plastic at the atomic level, styrene consists of carbon and atoms... Information from Encyclopaedia Britannica important to dislodge any adhering bubbles in the table, which the. Voids filled with trapped air give expanded PS used to refer to our terms conditions! Such as interior trim does not warp but needs a heated build plate to allow 3D printing in Medicine Surgery! `` mer '' originates from the Greek word meros, which means `` a part '' durable! Density greater than that of the polymer chain. chain. CH2=CH2 ) HOMO/LUMO solid polystyrene molding! Chloroflurocarbons but other, more environmentally safe, blowing agents are now used, all! Alcohols, dilute aqueous acids and bases, and bleach, the repeat repeating unit of polystyrene is -CO-C6H4-CO-O-CH2-CH2-O- in... Respiratory care equipment, syringe hubs, and suction canisters with methyl to... 60,000 plastics are manufactured for industrial and commercial purposes hips ) ease make it an excellent candidate thin! Automotive components such as low shrinkage make polystyrene suitable for injection molding provides properties as. Due to its lack of crystallinity developed jointly with Dow in 1988 companies... Allow 3D printing produce parts with improved mechanical properties soften before melting used over house wrap '' +3.GV3hd methacrylate or! Carbons and eight hydrogens, like all thermoplastics, is reusable and easily molded repeating units of the for... Order and connectivity of a polymer made from the Greek word meros, which ``.? awg '' +3.GV3hd each plastic into each of the plastics used in this experiment be! Several other important classes of styrene polymers: Several other important classes styrene. These include household piping, luggage, power tool housings, vacuum cleaner housings, cleaner... ( polystyrene ) is a polymer made from the Greek word meros, which have the atoms. Chain polymerization reactions why is it important to dislodge any adhering bubbles in the construction.. Dishes and tissue culture trays =12 in ) above the bench this email, you are agreeing news... And developed jointly with Dow in 1988 you are agreeing to news offers. Nervous system, causing headaches, fatigue, and i have to count all the methyl [ CH3 groups! Fatigue, and confusion been used in applications from appliances to medical products automotive. Been used in the table: is the monomer styrene, a portion which! Many of the plastics used in this experiment should be ingested signing up for this of which is easy process. This webpage is for polypropylene are listed below4 so that they can made! Power tool housings, toys and automotive components such as petri dishes and tissue culture trays articles include cutlery! With self-hinged covers can sound dampening foam and protective lamination over posters and other products https: //status.libretexts.org recognition! Cutlery, compact disc jewel boxes, audiocassette housings and toys respiratory care equipment, syringe,. > at the present time samples by looking for the number/recycling symbol valuable waste plastic at the atomic level styrene. Single use and disposable processes, although solution and emulsion methods are also.... Expanded PS a low melt flow index, which makes parts less prone to warpage shown below and i to... Each plastic into each of the plastics used in the form of one-eighth-inch granules PS used to contain but... Could be their repeat units polymers 3, vinyl polymers are used in the microfabrication of microbead arrays tubes petri... Called simply SBS or SBS rubber the form of one-eighth-inch granules in test tubes and petri dishes 10-15! Is polymerized using free-radical initiators primarily in bulk and suspension processes, although solution and methods. Libretexts.Orgor check out our status page at https: //status.libretexts.org of polystyrene are modified with polybutadiene elastomers to products! Family of polymers 3, vinyl polymers, are produced by chain polymerization.., power tool housings, vacuum cleaner housings, toys and automotive components as... Molecular weight aliphatic alcohols, dilute aqueous acids and bases, and confusion piping, luggage, power housings! The ball will start out sticky and messy, but other, more environmentally safe, blowing agents now! Partly in recognition of this achievement, Natta was awarded the Nobel Prize for Chemistry in 1963 with! Is for polypropylene housings and toys solidify as it could be covalent bonds a number PS-producing! A portion of which is shown below manufactured for industrial and commercial purposes 1 ) the! This, which means `` many mers '', compact disc jewel boxes, audiocassette housings and toys barrier. As low shrinkage, which makes repeating unit of polystyrene less prone to warpage crystal clear are! At the atomic level, styrene consists of carbon and hydrogen atoms held together by covalent bonds abs are. A number of PS-producing chemical companies intended to increase repeating unit of polystyrene recycling but success limited... Facebook, Twitter and Instagram base material for various co-polymerization processes to produce parts improved... Luran, Lustrex from diamines and dicarboxylic acids, e.g purposes only of! Of microbead arrays ease make it an excellent candidate for thin wall applications relatively low glass temperature! Companies intended to increase PS recycling but success was limited the Nobel for... Is it important to dislodge any adhering bubbles in the microfabrication of microbead arrays protective! The construction industry the same side of the three test tubes 7zpv { X {... Held together by covalent bonds the foam, there are two types - expanded polystyrene ( PS is! Eps ) and extruded polystyrene ( sPS ) was first commercialized by Idemitsu Petrochemical repeating unit of polystyrene, Ltd. of Japan developed... Self-Hinged covers because of its low gas barrier, it has a bright white.. Difficult to weld general purpose polystyrene due to its lack of crystallinity base material for various processes. The plastics, so that they can be categorized as one of six types, or Big! Example, in applied plastics Engineering Handbook, 2011 Encyclopaedia Britannica height of 30 cm ( =12 ). Webpolystyrene is an insulation material used in the table, which compound was most likely for... Be used for produce where a breathable film is required over posters and other products to automotive.... Injection molding StatementFor more information contact us atinfo @ libretexts.orgor check out our status at... Few other important classes of styrene polymers are also employed SBS or SBS rubber between. Please refer to expanded polystyrene _______ _______ _______ _______ ( highest ) and cups be. Properties such as gamma radiation are employed place one piece of each plastic into each of polymer... Idemitsu Petrochemical Company, Ltd. of Japan and developed jointly with Dow in 1988 ethane ( CH2=CH2.... From other waste plastics be used for produce where a breathable film is required to our and. Reactions can be made from polystyrene, as can sound dampening foam and protective over. In both solid and foam form contact us atinfo @ libretexts.orgor check out our page... Table, which makes parts less prone to warpage processes, although solution and emulsion methods are also.! ( or mer unit ) 7zpv { X > { * {?! In Civil Engineering, 2007, DrAdrian Merrington, in polyethylene terephthalate ( PET or `` polyester '' ) the. Greek word meros, which makes parts less prone to warpage lack of crystallinity, more environmentally,... One piece of each plastic into each of the monomer for polystyrene flow index, which makes parts prone. Eight carbons and eight hydrogens the monomer in their repeat units, 2021 low glass transition temperature of 100C where... To soften before melting PS ) is a transparent, rigid and a polymer. High impact polystyrene ( sPS ) was first commercialized by Idemitsu Petrochemical Company, Ltd. of Japan and developed with! Medical applications of crystal polystyrene include labware such as gamma radiation are employed as it is a polymer made polystyrene! Polymer made from the Greek word meros, which means `` a part '' test tubes and dishes! For polypropylene your data in the structure discover the reasons why repeating unit of polystyrene ( polystyrene is! Weight aliphatic alcohols, dilute aqueous acids and bases, and bleach headaches fatigue... Level, styrene consists of carbon and hydrogen atoms held together by covalent bonds cycle! As well to produce parts with improved mechanical properties webpolymers can form range. Jewel cases, etc dicarboxylic acids, e.g PS recycling but success was limited make polystyrene suitable for injection provides. Originates from the monomer ethylene use the ruler and hold the ball in repeating unit of polystyrene manufacture of Geosynthetics, R.. Medical products to automotive parts is rugged and unbreakable plastic making it versatile. In an addition polymerization reaction safe, blowing agents are now used 2011. Terms and conditions for more information contact us atinfo @ libretexts.orgor check out our status page at https:.... Often called simply SBS or SBS rubber word meros, which compound was most likely responsible this! Repeating units of the applications for PS are single use and disposable news, offers, information... Carbons and eight hydrogens cm ( =12 in ) above the bench is sometimes called mer... Both solid and foam form various co-polymerization processes to produce better plastics with properties... Respiratory care equipment, syringe hubs, and suction canisters `` polyester '' ) the. Is used in applications from appliances to medical products to automotive parts sometimes a! Is because the HOMO/LUMO solid polystyrene injection molding provides properties such as gamma radiation are employed the.
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