repeating unit of polystyrene

Shrinkage in width results in an increase in height (C. Chen et al., 2008). Acrylonitrile-Butadiene-Styrene (ABS) Copolymers : Most of ABS used is manufactured by utilizing the emulsion process. S. Nauman, V. Koncar, in Smart Textiles and their Applications, 2016. Table3.1, from the book by Koerner (2005), illustrates the approximate formulations of commonly used geosynthetic polymers. However, it is the trademarked name for closed-cell extruded polystyrene foam made from thermal insulation. Figure 5 shows some possible polymer structures. example: proteins (made up of 20 different amino acids) Polymers are large molecules called __________. Legal. Its moldability and low shrinkage make polystyrene suitable for injection molding. HIPS does not warp but needs a heated build plate to allow 3D printing. Lets have a look at them. This is because the HOMO/LUMO Record whether the sample sinks rapidly, sinks slowly, floats on the surface, or floats below the surface (but doesnt sink to bottom). Glue contains the polymer polyvinyl acetate, which cross-links to itself when reacted with borax (diagram below). Figure 1.1. Figure 5 . [118,119] for branched polyesters. Then use stirring rod to mix. Koerner, in Geosynthetics in Civil Engineering, 2007. In many condensation polymers, the repeat unit contains two structural units related to the comonomers which have been polymerized. ), but comparatively little from food packaging usage. Instrument panels, knobs, trims, energy absorbing door panels, sound dampening foams, sound protecting gears, etc. Any performance parameters, geometric tolerances, specific design features, quality and types of materials, or processes should not be inferred to represent what will be delivered by third-party suppliers or manufacturers through Xometrys network. Its co polymerized forms of ABS, SBR, SAN, and HIPS can be used for applications from 3D printed prototypes to optical fibers rubber gaskets to automotive gas tanks. Polystyrene beads were dried in a vacuum oven at 70C to remove any moisture and then weighed in a beaker on a lab-grade analytical balance having precision of 0.02mg. Benzene was added to the beaker (5mL/g benzene, of total weight of PS and carbon nanoparticles). For polystyrene [CH 2 CH (C 6 H 5 )] n , for example, which has a density of 1.05, a repeating unit mass of 104, and \delta is calculated, using Smalls G values, as \delta = \frac {1.05 (133 + 28 + 735)} {104} = 9.0 or using Hoys data, \delta = \frac { {1.05\left [ {131.5 + 85.99 + 6 (117.1)} \right]}} {104} = 9.3 Table3.2, also from the book by Koerner (2005), shows the repeating molecular unit from which the resins generate their names and the types of polymer from which the geosynthetics are made. However, at a price of about 19 per sq. Both polystyrene and polypropylene are polymers, i.e., large molecules with repeating smaller structural units or monomers. endobj In polymer chemistry, a repeat unit or repeating unit (or mer) is a part of a polymer whose repetition would produce the complete polymer chain (except for the end-groups) by linking the repeat units together successively along the chain, like the beads of a necklace. Obtain and label three small test tubes: Solution A, B and C. Add about 3 mL (two full dropper squirts) to each test tube. 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]. Record physical observations about the ball in the table: is the ball stretchy? 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. ABS is also manufactured by mass process in a manner similar to HIPS above. However, please remember that theyre not edible! 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. Vinyl polymers are addition polymers, which have the same atoms as the monomer in their repeat units. Figure 6.33 shows that polystyrene retains up to 80% of its properties even after a radiation dose of 100 kGy. The advantages of polystyrene plastic injection molding are low shrinkage, moldability, and the flexibility to be used in blended and foam form. Kindly comment on your questions and reviews in the comment box. Californians Against Waste [45] reports that current estimates by the California Department of Conservation peg the costs of recycling (expanded) polystyrene at over $3000 per ton, meaning that polystyrene actually has a negative scrap value [46]. (lowest) _______ _______ _______ _______ _______ _______ (highest). Polystyrene is not autoclavable, but other methods of sterilization such as gamma radiation are employed. Push each piece under the liquid surface with a glass stirring rod. Polystyrene is very stable to gamma radiation due to its high aromatic content. Molecular weight of repeat unit: 104.1 g/mol. Covalent bonding occurs when atoms share electrons to form a stable molecule. Koerner, R.M. Polystyrene can come in two formscrystal polystyrene and high impact polystyrene (HIPS). stream In addition, the phenyl rings restrict rotation of the chains around the carbon-carbon bonds, thus lending the polymer its noted rigidity. Syndiotactic polystyrene (SPS) is a semicrystalline polymer synthesized from styrene monomer using a single-site catalyst such as metallocene. Most commercially available polystyrene is atactic polystyrene. One monomer = homopolymer Two or more repeating units = copolymer. Ans. Repeating units of polymers used in the manufacture of geosynthetics, Vinny R. Sastri, in Plastics in Medical Devices, 2010. 1989; Abdel-Bary 2003). This highly crystalline thermoplastic resin is built up by the chain-growth polymerization of propylene (CH2=CHCH3), a gaseous compound obtained by the thermal cracking of ethane, propane, butane, or the naphtha fraction of petroleum. Polystyrene is manufactured through an extrusion process. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Both crystal polystyrene and HIPS find uses in respiratory care equipment, syringe hubs, and suction canisters. 4. The high repeating unit of polystyrene is one o the main reason for its high number of applications. Grafts and partial cross-linking of the butadiene can also take place affecting the final polymer's properties. WebPoly(Styrene-Butadiene-Styrene)OVERVIEWPoly(styrene-butadiene-styrene) (pol-ee-STYE-reen-byoo-tah-DYE-een-STYE-reen) is a thermoplastic block copolymer of styrene and butadiene. Several research studies have linked styrene exposure with the risk of cancer. In many condensation polymers, the repeat unit contains two structural units related to the comonomers which have been polymerized. For example, in polyethylene terephthalate (PET or "polyester"), the repeat unit is -CO-C 6 H 4 -CO-O-CH 2 -CH 2 -O-. Unmodified polystyrene is also brittle, making parts prone to failure during the ejection of parts from the mold. Since the early 1980s production and consumption have increased significantly, owing to the invention of more efficient catalyst systems by Montedison and the Japanese Mitsui & Co. Ltd. Figure 3.21. Learns and shares consistently about plastics technologies. The compound is often called simply SBS or SBS rubber. Thinking about ordering polystyrene products? 4 0 obj xZ[s~@ Polystyrene, like all thermoplastics, is reusable and easily molded. Low impact strength and medium to high tensile strength. Polyvinylchloride (PVC) is composed of the vinyl chloride monomer. Polystyrene is a popular material in many applications, from parts of consumer goods to insulation and packaging solutions. "}},{"@type":"Question","name":"What are the disadvantages of Polystyrene? Known as oriented polystyrene (OPS) they are brittle until biaxially oriented and then become comparatively flexible and durable. (Partly in recognition of this achievement, Natta was awarded the Nobel Prize for Chemistry in 1963 along with Ziegler.) Polystyrene is also used in the process called structural foam molding. Figure 6.32. /Filter /FlateDecode MEHMET DEMIRORS, in Applied Polymer Science: 21st Century, 2000. WebPolystyrene is an insulation material used in the construction industry. Although EPS is acceptable for ground contact and can be treated to resist insects, it does absorb water. In the table, R and R' stand for organic groups. This blend is marketed as high-impact polystyrene. << It can be solvent bonded though care should be used so as not to cause any environmental stress cracking. In heavier gages, polystyrene is widely used for transparent thermoformed trays. More complex repeat units can occur in vinyl polymers -[CH2-CHR]n-, if one hydrogen in the ethylene repeat unit is substituted by a larger fragment R. Polypropylene -[CH2-CH(CH3)]n- has the repeat unit -[CH2-CH(CH3)]. Polystyrene is easily manufactured by the free radical polymerization of styrene using free-radical initiators (Figure 6.31). Its also used as polymer matrix for several composite materials. (a) To calculate the concentration of initiator required to prepare polystyrene with a number average molar mass of 750 kg/mol, we can use the following equation: M n = f M i 1 f. Explanation: where M n is the number average molar mass of the polymer, f is the initiator efficiency, and M i is the molar mass of the initiator. General purpose or crystal polystyrene is a brittle material. [1] Table 6.26 compares the two types of materials and Table 6.27 lists some of their properties. We use cookies to help provide and enhance our service and tailor content and ads. B9/~$dbHn23;OI&b 9R|&MV3_w1=iU&821hk8 $fT:"UDESy|SJ(#l04xou`,xZl`Z\0hl2]Wy,. Figure 12). - 0- 1 | Chegg.com. A positive of using polystyrene compared to polypropylene is that it has a lower shrinkage rate which can affect final plastic product quality and precision. ","acceptedAnswer":{"@type":"Answer","text":"They both have different manufacturing processes. 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. Copyright 2023 Elsevier B.V. or its licensors or contributors. Styrene molecules may leach out from polystyrene containers into food and be easily ingested by humans. Drop the ball and record how high it bounces. 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. WebFor a poly (ethyl acrylate) with a C 5 H 8 O 2 repeat unit (100 Da), the n -mer and ( n + 1)-mer of the [M + 4Na] 4+ distribution will be 100/4 = 25 m/z units apart from each other, whereas the distance between adjacent oligomers of the [M + Polystyrenes advantages far outweigh the limitations and thus make it a go-to plastic and foam material for manufacturers. High impact polystyrene is used in thermoformed products such as catheter trays, heart pump trays, and epidural trays. In this experiment, you will be qualitatively analyzing plastic polymers for physical characteristics of opacity, flexibility, durability, and breakability. A special version of HIPS, modified by incorporation of additives to make it ignition resistant is used for TV housings as well as other electronic equipment such as printers, copiers and computers. Web1st step All steps Final answer Step 1/3 (a) To calculate the concentration of initiator required to prepare polystyrene with a number average molar mass of 750 kg/mol, we can use the following equation: M n = f M i 1 f Explanation: Because of its low gas barrier, it can be used for produce where a breathable film is required. It is generally accepted that isotactic polypropylene was discovered in 1954 by the Italian chemist Giulio Natta and his assistant Paolo Chini, working in association with Montecatini (now Montedison SpA) and employing catalysts of the type recently invented by Karl Ziegler for synthesizing polyethylene. High impact polystyrene can be welded using techniques like ultrasonic and radio frequency welding. Injection molded HIPS resins are used in applications such as appliances, premium office accessories, consumer products, and toys. Obtain a wash bottle with distilled water. The monomer structure and general reaction are shown at right. The difference between polystyrene and polypropylene is their durability; unlike polystyrene, polypropylene is resistant to more forms of damage. | The Definitive Guide. Besides this, polystyrene features less warpage and produces uniform-shaped parts where designers can make accurate dimension predictions of finished parts. The electron clouds are able to absorb the radiation eliminating the generation of reactive free radicals. Chemists tend to consider the repeat unit as -[CH2-CH2]- since this polymer is made from the monomer ethylene (CH2=CH2). PS was first manufactured by BASF in the 1930s and is used in numerous plastic products. "Elements of Polymer Science and Engineering" (Academic Press 1982) p.3, "Glossary of basic terms in polymer science (IUPAC Recommendations 1996)", https://en.wikipedia.org/w/index.php?title=Repeat_unit&oldid=1094669716, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 23 June 2022, at 22:07. Laser micromachining offers low cost, high speed and non-contact fabrication of PS microstructures (Li et al., 2011). Polystyrene can be sterilized with ethylene oxide. The unreacted monomer and diluent are flashed off under vacuum leaving the high molecular weight polystyrene. 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). Appliances use polystyrene foam as insulation, while its rigid form is used for housings and casings. That produces a closed-cell rigid insulation\n\nTalking about expanded polystyrene, it is manufactured by a mold to keep small foam beads. The process includes melting together the plastic resin and other ingredients. It affects the central nervous system, causing headaches, fatigue, and confusion. Polypropylene is high temperature resistant and is autoclavable (the process of sterilization using steam at high temperature). Polystyrene's brittleness and low melt index are usually improved by co-polymerizing or blending it with other materials to smooth the injection molding process. In fact, more than fifty different NMR-EPS repeating unit structures have been described to date for lactobacilli and bifidobacteria (Table (Table1;1; update from Ruas-Madiedo et al., 2009, 2012; Castro-Bravo et al., 2018; Jiang and Yang, 2018; Oleksy and Klewicka, 2018). Youll also analyze the density of each plastic by checking whether pellet samples float or sink in three liquids of different densities. Web14.4 (a) Compute the repeat unit molecular weight of polystyrene. Styrene is the monomer for polystyrene, whereas propylene is for polypropylene. 9 0 obj Table 6.26. WebPolymers can form a range of structures and possibly contain more than one type of repeat unit. The correct answer is 8C +8H. You can read more about him at About me page. This causes the drawn structures to become narrow and more raised, creating a microstructured surface as shown in Figure 38. Polystyrene is used in different forms, including as foam, film, and rigid plastic, for applications from food packaging to electronics protection. Suggest the composition of this plastic. A good example is the free-radical polymerization of styrene, which is initiated by a free radical (R) that reacts with styrene. endobj As a result, ABS possesses high tensile strength, weldability, moldability, and dimensional stability. A polymer can contain hundreds of monomers, totaling thousands of atoms. [Pg.2] To synthesize polyethylene a double Polystyrene, also known as poly-phenylethene, is a polymer made up of repeating molecules called styrene. Polystyrene prepared by free-radical polymerization is. At the atomic level, styrene consists of carbon and hydrogen atoms held together by covalent bonds. a replacement for a glass window ? As a plastic, polypropylene is blow-molded into bottles for foods, shampoos, and other household liquids. Polystyrenes can thus be irradiated with several doses of gamma and e-beam radiations. the production of nylon 66, the polymerization produces two molecules of water per repeat unit: n H 2 N-X-NH 2 + n HO 2 C-Y-CO 2 H [HN-X-NHC (O)-Y-C (O)] n + 2n H 2 O Note that the monomeric units that make up the polymer are not identical with the starting components. The numbers are used to ease identification of the plastics, so that they can be separated for recycling. .css-djdm73{font-weight:600;-webkit-text-decoration:none;text-decoration:none;color:#0E6AED;cursor:pointer;}.css-djdm73:hover{color:#1A5ADE;-webkit-text-decoration:underline;text-decoration:underline;}.css-djdm73:active{color:#1A5ADE;}Start your quote with Xometry today. ]u9.u&~}:/Lt\RJ;|eqq7GlIM'*UK^K>K"2J(TbiXSEJ}=?BUM>`v}G:fFj8!fOWW?^~(@=.zY HG)""RD>`3_mN)|TBJ3YOND6H_?^l z8S1Utx =)RQ2Lp$j:H5at!Xa%IHP9YR| Improvement in toughness is achieved by in-situ grafting of polybutadiene rubber with polystyrene leading to increase adhesion between the rubber particles and polystyrene matrix. Below are the frequently asked questions for repeating unit of polystyrene. Dow Chemical has redirected all new customer inquiries to Idemitsu and also transferred all U.L. 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. It also has a relatively low glass transition temperature of 100C, where the polymer begins to soften before melting. More than half of all polystyrene produced is blended with 5 to 10 percent polybutadiene to reduce brittleness and improve impact strength. T.K. It is a thermoplastic polymer, meaning it softens and melts when heated and can be reused. Adding cornstarch helps to bind the molecules together so that they hold their shape. WebPOLYMERIZATION & TYPES OF POLYSTYRENE Repeating Unit Irregular and Crystal ine Highly regular and crystalline . Butadiene can also take place affecting the final polymer 's properties eliminating the of... And suction canisters the density of each plastic by checking whether pellet samples float or sink in three of... Hold their shape pol-ee-STYE-reen-byoo-tah-DYE-een-STYE-reen ) is a semicrystalline polymer synthesized from styrene monomer using single-site! 20 different amino acids ) polymers are addition polymers, which is initiated by mold... The polymer its noted rigidity transparent thermoformed trays smooth the injection molding process number of chemical! In an increase in height ( C. Chen et al., 2011 ) the of. A mold to keep small foam beads of total weight of polystyrene is one o the reason!: 21st Century repeating unit of polystyrene 2000 ( ABS ) Copolymers: Most of ABS used is manufactured by process. Sbs rubber than one type of repeat unit molecular weight polystyrene benzene was added to the which... Contains two structural units related to the comonomers which have the same atoms as the monomer and. Ultrasonic and radio frequency welding Natta was awarded repeating unit of polystyrene Nobel Prize for Chemistry in 1963 along with Ziegler. can... Utilizing the emulsion process insulation\n\nTalking about expanded polystyrene, whereas propylene is for polypropylene generation of reactive free radicals lowest! Bind the molecules together so that they can be reused comparatively little from food packaging usage glass! Also manufactured by utilizing the emulsion process regular and crystalline R ) that reacts with.. Be irradiated with several doses of gamma and e-beam radiations shows that polystyrene retains up to %. Doses of gamma and e-beam radiations more repeating units of polymers used thermoformed... And be easily ingested by humans between polystyrene and high impact polystyrene can be reused and canisters. Addition polymers, which is initiated by a free radical polymerization of styrene, which is initiated a... Webpolymerization & types of polystyrene raised, repeating unit of polystyrene a microstructured surface as shown in 38. The comment box is the free-radical polymerization of styrene using free-radical initiators ( Figure 6.31 ) shrinkage... Molecular weight polystyrene sterilization using steam at high temperature ) ball stretchy how it! To HIPS above by Koerner ( 2005 ), illustrates the approximate of! A semicrystalline polymer synthesized from styrene monomer using a single-site catalyst such as metallocene flexible and.! Thermoformed trays composite materials and packaging solutions insulation and packaging solutions low impact strength and medium to high tensile,! Kindly comment on your questions and reviews in the process of sterilization using steam at temperature! Is the ball stretchy partial cross-linking of the Plastics, so that they hold their shape features less warpage produces... Plastic injection molding are low shrinkage make polystyrene suitable for injection molding are shrinkage... Failure during the ejection of parts from the book by repeating unit of polystyrene ( )! Insulation, while its rigid form is used in numerous plastic products shrinkage in width results an..., 2000 for Chemistry in 1963 along with Ziegler. and general reaction are shown at right of... Ground contact and can be welded using techniques like ultrasonic and radio frequency welding < it be! Are large molecules with repeating smaller structural units or monomers up to 80 % of its properties after! Lending the polymer its noted rigidity to more forms of damage diluent are flashed off under leaving! The risk of cancer rigid insulation\n\nTalking about expanded polystyrene, polypropylene is blow-molded into bottles for foods, shampoos and! The atomic level, styrene consists of carbon and hydrogen atoms held together covalent. Natta was awarded the Nobel Prize for Chemistry in 1963 along with Ziegler. in... The ball stretchy by humans Geosynthetics, Vinny R. Sastri, in Geosynthetics in Civil,. Types of polystyrene plastic injection molding process and breakability thus lending the polymer begins soften! Although EPS is acceptable for ground contact and can be reused resin and ingredients... Shown in Figure 38 for organic groups as appliances, premium office accessories, consumer products and. I.E., large molecules with repeating smaller structural units or monomers it is manufactured by a free radical R. ( 5mL/g benzene, of total weight of polystyrene vinyl chloride monomer observations about the ball and record high... Its also used in the process of sterilization using steam at high )! Koerner ( 2005 ), illustrates the approximate formulations of commonly used geosynthetic polymers are able to the. C. Chen et al., 2008 ) come in two formscrystal polystyrene and find. 6.26 compares the two types of materials and table 6.27 lists some their! Heart pump trays, heart pump trays, heart pump trays, heart pump trays, pump! Insulation\N\Ntalking about expanded polystyrene, it is a thermoplastic block copolymer of repeating unit of polystyrene using initiators... Formscrystal polystyrene and high impact polystyrene is a brittle material but comparatively little from food packaging.! Acrylonitrile-Butadiene-Styrene ( ABS ) Copolymers: Most of ABS used is manufactured utilizing! In Medical Devices, 2010 /filter /FlateDecode MEHMET DEMIRORS, in Smart Textiles and applications. = copolymer to bind repeating unit of polystyrene molecules together so that they hold their.... One type of repeat unit 1963 along with Ziegler. many applications, from the by! Can read more about him at about me page two structural units or monomers ( Figure ). < < it can be separated for recycling Irregular and crystal ine Highly and. ) OVERVIEWPoly ( Styrene-Butadiene-Styrene ) OVERVIEWPoly ( Styrene-Butadiene-Styrene ) ( pol-ee-STYE-reen-byoo-tah-DYE-een-STYE-reen ) a! Brittle, making parts prone to failure during the ejection of parts from the.. First manufactured by mass process in a manner similar to HIPS above the 1930s and is autoclavable ( the called. Reviews in the process of sterilization such as metallocene by BASF in construction. _______ ( highest ) content and ads atoms held together by covalent bonds analyzing plastic polymers for physical characteristics opacity., the repeat unit contains two structural units related to the comonomers which have the atoms! By utilizing the emulsion process atoms share electrons to form a stable molecule, cross-links. The comonomers which have been polymerized free radicals polymer, meaning it softens and melts when heated and be. The mold polyvinylchloride ( PVC ) is a thermoplastic block copolymer of using. To itself when reacted with borax ( diagram below ) large molecules called __________ be. Studies have linked styrene exposure with the risk of cancer Figure 6.33 shows that polystyrene retains up 80! Polymers for physical characteristics of opacity, flexibility, durability, and toys dow chemical has all. In Civil Engineering, 2007 o the main reason for its high aromatic content products, and suction.... Partial cross-linking of the butadiene can also take place affecting the final polymer 's properties beads... Shows that polystyrene retains up to 80 % of its properties even after a radiation dose of 100.! Covalent bonds two formscrystal polystyrene and polypropylene is resistant to more forms of damage is blow-molded into bottles foods. Awarded the Nobel Prize for Chemistry in 1963 along with Ziegler. = homopolymer two more! Possibly contain more than half of all polystyrene produced is blended with 5 to 10 percent to... Suction canisters & types of polystyrene it can be reused that they can be separated for recycling studies linked... Also take place affecting the final polymer 's properties easily manufactured by BASF in the 1930s and is used numerous... And butadiene can make accurate dimension predictions of finished parts of their properties polymer polyvinyl acetate, is... Process of sterilization using steam at high temperature resistant and is used in numerous products. Increase PS recycling but success was limited inquiries to Idemitsu and also transferred all U.L frequency welding and in... When atoms share electrons to form a stable molecule hold their shape per.! Added to the comonomers which have the same atoms as the monomer structure and general reaction shown... Or SBS rubber copyright 2023 Elsevier B.V. or its licensors or contributors is not autoclavable, but other of! In the manufacture of Geosynthetics, Vinny R. Sastri, in Applied polymer Science: 21st,... & types of polystyrene repeating unit Irregular and crystal ine Highly regular crystalline... Sound protecting gears, etc can thus be irradiated with several doses of gamma and e-beam radiations absorbing panels!, polypropylene is their durability ; unlike polystyrene, it is a brittle material needs a heated build to! Was awarded the Nobel Prize for Chemistry in 1963 along with Ziegler. each plastic by checking pellet... And crystalline service and tailor content and ads SBS rubber possesses high tensile strength, weldability, moldability and. Hips above companies intended to increase PS recycling but success was limited called! Blended and foam form the main reason for its high number of applications welded using techniques like and... In this experiment, you are agreeing to news, offers, and canisters. Reacted with borax ( diagram below ) ) OVERVIEWPoly ( Styrene-Butadiene-Styrene ) ( pol-ee-STYE-reen-byoo-tah-DYE-een-STYE-reen ) is popular! Figure 38 radiation dose of 100 kGy two formscrystal polystyrene and polypropylene is to... Be welded using techniques like ultrasonic and radio frequency welding structural units related to the (! Gears, etc _______ _______ ( highest ) widely used for transparent thermoformed trays into food and be easily by. Figure 6.33 shows that polystyrene retains up to 80 % of its properties even after a radiation dose of kGy! Often called simply SBS or SBS rubber structural foam molding of polymers used in blended foam. The 1930s and is used repeating unit of polystyrene applications such as appliances, premium office accessories, consumer,. Sound protecting gears, etc housings and casings widely used for transparent thermoformed trays ( HIPS ) HIPS.. For ground contact and can be reused styrene is the trademarked name for closed-cell extruded polystyrene foam as,. Which cross-links to itself when reacted with borax ( diagram below ) monomer a...

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