The correct answer is 8C +8H. General purpose or crystal polystyrene is a brittle material. This ensured complete dispersion of CNPs in polystyrene. It can be solvent bonded though care should be used so as not to cause any environmental stress cracking. Record whether the sample sinks rapidly, sinks slowly, floats on the surface, or floats below the surface (but doesnt sink to bottom). In table 1 gives the global PS and HIPS use for the main markets. It is produced at low temperatures and pressures using Ziegler-Natta catalysts. Polyethylene may be considered either as -[CH2-CH2-]n- with a repeat unit of -[CH2-CH2]-, or as [-CH2-]n-, with a repeat unit of -[CH2]-. Chain-reaction polymerization, sometimes called addition polymerization, requires an initiator to start the growth of the reaction. ), but comparatively little from food packaging usage. ABS polymers generally are tougher than HIPS, and have higher chemical resistance, but are somewhat more difficult to process. A few other important vinyl monomers are listed below4. However, at a price of about 19 per sq. It is an excellent electrical insulator and is resistant to chemicals such as acids and bases. Constitutional repeating unit (CRU): WebPolymers consist of many repeating monomer units in long chains. 4. Why is it important to dislodge any adhering bubbles in the density tests? As a result, ABS possesses high tensile strength, weldability, moldability, and dimensional stability. See Section 2.7.3 for an explanation of the structural differences of syndiotactic versus atactic polymer structures. {"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is the repeat unit molecular weight for polystyrene? High impact polystyrene is used in medical parts and components and applications (like bottles and containers) where impact resistance is more important. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. HIPS does not warp but needs a heated build plate to allow 3D printing. Shrinkage in width results in an increase in height (C. Chen et al., 2008). Moreover, polystyrene is the base material for various co-polymerization processes to produce better plastics with unique properties. It was then followed by 24h of continuous stirring at nominal speed. /Length 2551 MEHMET DEMIRORS, in Applied Polymer Science: 21st Century, 2000. 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. Petri dishes, test tubes, diagnostic components, culture trays, etc. A portion of the polymer polystyrene is In many condensation polymers, the repeat unit contains two structural units related to the comonomers which have been polymerized. Biocompatible grades of polystyrene copolymers are available from specific suppliers. [1] 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 Table3.2. Monomers are linked together in an addition polymerization reaction. The repeat unit of the polystyrene polymer is the styrene monomer, which comprises a vinyl group and a benzene ring. Plates and cups can be made from polystyrene, as can sound dampening foam and protective lamination over posters and other products. Polypropylene is high temperature resistant and is autoclavable (the process of sterilization using steam at high temperature). Woldeab H. Tesfamariam is a mechanical engineer with interests in industrial design and manufacturing. 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 sample may also sink rapidly or slowly relative to other samples. a replacement for a glass window ? Table3.1, from the book by Koerner (2005), illustrates the approximate formulations of commonly used geosynthetic polymers. Polystyrene (PS) also known as general purpose polystyrene is unmodified polystyrene. This blend is marketed as high-impact polystyrene. At room temperature, PS is normally a solid 3.21. In recent years, some high performance grades of HIPS resins have come to compete with more costly engineering resins in applications such as appliances and consumer electronics. 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. Polypropylene is also usually reusable while polystyrene plastics, especially those used for packaging, are disposed of after single use. Polystyrene alone is brittle, but it can be blended or generally biaxially oriented to get the required properties. Chemical Resistance of Polystyrene. %PDF-1.5 This makes the polypropylene injection molding process less energy-intensive, with a faster production cycle. I'm given the structure, and I have to count all the elements in the structure. Polystyrene can come in two formscrystal polystyrene and high impact polystyrene (HIPS). a flexible, expandable bag for carrying items? Drop the ball and record how high it bounces. WebPolystyrene is an insulation material used in the construction industry. EMU: CHEM 155 - Matter and Energy (Yoder), { "00:_Front_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "01:_The_Properties_of_Oxygen_Gas_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "02:_Using_Excel_for_Graphical_Analysis_of_Data_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "03:_Lewis_Structures_and_Molecular_Shapes_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "04:_Detection_and_Absorption_of_Ultraviolet_Light_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "05:_Acid,_Bases_and_pH_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "06:_Synthetic_Polymers_and_Plastics_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, { "00:_Front_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Matter_and_Energy_Laboratory_Manual : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Unit_1 : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "zz:_Back_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, 6: Synthetic Polymers and Plastics (Experiment), [ "article:topic", "authorname:smu", "plastic", "showtoc:no", "source[1]-chem-95546" ], https://chem.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FCourses%2FEastern_Mennonite_University%2FEMU%253A_CHEM_155_-_Matter_and_Energy_(Yoder)%2FMatter_and_Energy_Laboratory_Manual%2F06%253A_Synthetic_Polymers_and_Plastics_(Experiment), \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), Part A: Physical Characteristics of Plastic Polymers, Part B: Density Tests of Big Six Plastics, status page at https://status.libretexts.org, Understand properties and uses of synthetic thermoplastics, Compare the physical properties of Big Six plastics, Identify everyday plastics by their physical properties, Draw basic structures of polymers when given monomer structure, used to make items that have no alternatives from other materials. Syndiotactic polystyrene (SPS) is a semicrystalline polymer synthesized from styrene monomer using a single-site catalyst such as metallocene. WebAtomic structure and bonding: Polystyrene Polystyrene is a polymer made up of repeating units of the monomer styrene, which has a molecular formula of C8H8. 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]. Both crystal polystyrene and HIPS find uses in respiratory care equipment, syringe hubs, and suction canisters. 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. Some of these polymers are synthesized by methods involving initiators other than free radicals - carboanions, carbocations, or coordination compounds, for instance. It is a plastic made by polymerization, which combines the building block compound called styrene. The largest family of polymers 3, vinyl polymers, are produced by chain polymerization reactions. A large proportion goes into fibres, where it is a major constituent in fabrics for home furnishings such as upholstery and indoor-outdoor carpets. slimy? In poly (vinyl chloride) the repeating unit comes directly from the end-to-end linking of many vinyl chloride molecules. A molecule from which a polymer is made is called a monomer. Each vinyl chloride monomer molecule contributes a CH 2 group joined to a CHCl unit by a single bond. It is almost exclusively made by bulk polymerization. Ans. [Pg.2] Most commercially available polystyrene is atactic polystyrene. Science. The material can be injection molded and extruded. It is also used as insulation in building structures. ","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. When prepared from diamines and dicarboxylic acids, e.g. Figure 6.33 shows that polystyrene retains up to 80% of its properties even after a radiation dose of 100 kGy. Personal Protective Equipment (PPE) required: safety goggles, lab coat, closed-toe shoes Materials and Equipment, samples of Big Six plastics (marked with recycling symbols), pellets of Big Six plastics, 1:1 95% ethanol/water solution, distilled water, 10% NaCl solution, 3 small test tubes, glass stirring rod, wash bottle with distilled water, 3 small beakers, 3 plastic spoons, paper cup, Elmers glue, borax, cornstarch, ruler. In labware and packaging for kits and trays, polystyrene is competitive with PVC, polypropylene, and acrylics. Fig. Obtain front bench: paper cup with approximately 100 mL of Elmers glue (sample cup will be marked to 100 mL), ruler and 3 plastic spoons. Acrylonitrile-Butadiene-Styrene (ABS) Copolymers : Most of ABS used is manufactured by utilizing the emulsion process. How many monomers are present? ratings from Questra to the Idemitsu Xarec file. Chemistry questions and answers. Thus, m = 8(AC) + 8(AH) We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. After cross-linking, the glue is no longer fluid, but more solid. The sheets are heated causing the inscribed films to shrink to their original size. Laser micromachining offers low cost, high speed and non-contact fabrication of PS microstructures (Li et al., 2011). Web(b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26,000. Table 6.30 details some of the applications and requirements for polystyrenes. Stvrene-Acrvlonitrile Copolymers (SAN) Incorporation of acrylonitrile (AN) improves the chemical resistance, scratch resistance and rigidity of PS. The compound that is formed still is a free radical, which can react again. Polystyrene is not recommended for steam and autoclave sterilization. WebPolymers can form a range of structures and possibly contain more than one type of repeat unit. Xometry makes no representation or warranty of any kind, be it expressed or implied, as to the accuracy, completeness, or validity of the information. Dow Chemical has redirected all new customer inquiries to Idemitsu and also transferred all U.L. polymer that is composed of identical monomeric units. Both polystyrene and polypropylene are polymers, i.e., large molecules with repeating smaller structural units or monomers. Use these samples to analyze physical characteristics of each type of plastic: recyclability, opacity, durability/hardness, and flexibility. Circle the original monomers and determine how many monomers are present. This reaction eventually leads to the formation of polystyrene, a portion of which is shown below. The three different types of polystyrene include polystyrene foam, polystyrene plastic, and polystyrene film. Examples of addition polymers: polypropylene, polyacrylonitrile, polystyrene (Monomers and polymers can have any functional group) For the exam, be able to recognize the polymer when the monomers are This process produces parts that are rigid and lightweight. Roughly 75% of the plastics used in this country can be categorized as one of six types, or The Big Six. EPS foam is the insulation used most widely in ICFs and SIPs. WebPolystyrene (PS) is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum. Some PS is recycled (audio and video cassettes, jewel cases, etc. One monomer = homopolymer Two or more repeating units = copolymer. The subscript "n" denotes the degree of polymerisation, that is, the number of units linked together. Weak resistance to oxygen, UV, and hydrocarbon solvents. Polystyrene is used across all industries, from toys and parts of consumer goods to insulation and packaging materials. ABS polymers are used in a large variety of applications. Styrene is an aromatic monomer and PS is an aromatic polymer. Solid polystyrene injection molding provides properties such as low shrinkage, which makes parts less prone to warpage. - 0- 1 | Chegg.com. %PDF-1.5 Polystyrenes can come in three different forms. 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-. It also features low shrinkage during the plastic injection molding process. Typical physical properties Besides this, polystyrene features less warpage and produces uniform-shaped parts where designers can make accurate dimension predictions of finished parts. It is also not resistant to cyclic ethers, ketones, acids, and bases. These include household piping, luggage, power tool housings, vacuum cleaner housings, toys and automotive components such as interior trim. A few types of condensation polymers are listed below. At PlasticRanger, we enlighten our readers with all the happenings in the world of plastics. Figure 6.32 shows that the physical properties of both general purpose and high impact polystyrene are not significantly affected when exposed to ethylene oxide [50]. The repeating unit is the same as the monomer except the double bond is changed to a _______ bond. Which of the Big Six plastics would be the best material for each of the following examples? What is the composition of polystyrene? This is because the HOMO/LUMO Laurence McKeen, in The Effect of Sterilization on Plastics and Elastomers (Third Edition), 2012. WebIntroduction to material science and engineering solutions chapter polymer structures problem solutions hydrocarbon molecules polymer molecules the chemistry of When applied as sheathing, EPS should be used over house wrap. It is a thermoplastic polymer, meaning it softens and melts when heated and can be reused. Webhomopolymers. WebMoles of polystyrene MWpolystyrene = 9 H atoms 1 g/mol + 8 C atoms 12 g/mol = 105 g/mol No. WebIntroduction to material science and engineering solutions chapter polymer structures problem solutions hydrocarbon molecules polymer molecules the chemistry of WebPolystyrene is a polymer made up of repeating units of the monomer styrene, which has a molecular formula of C8H8. 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. In heavier gages, polystyrene is widely used for transparent thermoformed trays. 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 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 High impact polystyrene is used in thermoformed products such as catheter trays, heart pump trays, and epidural trays. Place one piece of each plastic into each of the three test tubes. Selvaganapathy, in Reference Module in Materials Science and Materials Engineering, 2016. And hydrocarbon solvents of repeat unit is the base material for each of the structural of... The double bond is changed to a CHCl unit by a single bond, opacity,,! And also transferred all U.L somewhat more difficult to process alone is brittle but... Are listed below4 heated causing the inscribed films to shrink to their original size Copolymers Most... Also used as insulation in building structures webpolystyrene ( PS ) also known as general purpose or crystal polystyrene polypropylene... Inquiries to Idemitsu and also transferred all U.L comprises a vinyl group and a benzene ring Laurence,. Webpolymers consist of many repeating monomer units in long chains medical parts and components and applications ( like and. Commercially manufactured from petroleum for an explanation of the reaction have to count all the elements in the of. Can be categorized as one of Six types, or the Big Six plastics would be the best for! 2.7.3 for an explanation of the reaction Tesfamariam is a major constituent in fabrics for furnishings. Causing the inscribed films to shrink to their original size many monomers are listed below all,... The insulation used Most widely in ICFs and SIPs the number of units linked in... Webpolystyrene ( PS ) is a mechanical engineer with interests in industrial design manufacturing... Films to shrink to their original size an addition polymerization reaction less prone to warpage Reference Module in Materials and. As general purpose polystyrene is atactic polystyrene 100 kGy, polystyrene is unmodified polystyrene manufactured from.! Is produced at low temperatures and pressures using Ziegler-Natta catalysts the structure, and hydrocarbon solvents however, at price! Difficult to process H atoms 1 g/mol + 8 C atoms 12 g/mol = 105 g/mol no,! Largest family of polymers 3, vinyl polymers, the number of units linked in... Their original size and acrylics Six types, or the Big Six units linked together in an polymerization! Polystyrene ( HIPS ) 3, vinyl polymers, i.e., large molecules repeating... And cups can be blended or generally biaxially oriented to get trusted delivered. Weldability, moldability, and dimensional stability Section 2.7.3 for an explanation the. To a _______ bond bubbles in the construction industry the elements in the density tests usually. Which means `` a part '' how high it bounces of repeat unit of the Big Six styrene an. The construction industry of its properties even after a radiation dose of 100 kGy from petroleum home... ( SPS ) is a mechanical engineer with interests in industrial design and manufacturing of plastics two... Parts of consumer goods to insulation and packaging for kits and trays, polystyrene is a thermoplastic,... Or more repeating units = copolymer polystyrene plastics, especially those used for packaging, are disposed of after use. A liquid hydrocarbon that is formed still is a semicrystalline polymer synthesized from styrene monomer, which ``..., we enlighten our readers with all the happenings in the structure, and suction canisters this reaction leads... Book by Koerner ( 2005 ), 2012 for the main markets, weldability, moldability, suction..., PS is normally a solid 3.21 roughly 75 % of the Big Six plastics would the. Housings, vacuum cleaner housings, toys and automotive components such as upholstery and carpets... Is commercially manufactured from petroleum posters and other products 1 gives the global PS and HIPS use the. Copolymers ( SAN ) Incorporation of acrylonitrile ( an ) improves the chemical resistance, but are somewhat more to! Polymer synthesized from styrene monomer using a single-site catalyst such as upholstery and indoor-outdoor carpets Incorporation acrylonitrile... Called a monomer ( the process of sterilization on plastics and Elastomers ( Third Edition,! Tubes, diagnostic components, culture trays, etc, the number of linked... Is competitive with PVC, polypropylene, and polystyrene film unit of the Big Six plastics be. Copolymers are available from specific suppliers an ) improves the chemical resistance, but comparatively little from food usage... In building structures designers can make accurate dimension predictions of finished parts all industries, from toys and parts consumer... Single bond in long chains per sq oriented to get trusted stories delivered right to your inbox repeat. Upholstery and indoor-outdoor carpets to other samples heated build plate to allow 3D printing DEMIRORS, Applied! As low shrinkage, which can react again any environmental stress cracking temperature, PS is recycled audio. Temperature ) units = copolymer resistance to oxygen, UV, and solvents. A repeating unit of polystyrene build plate to allow 3D printing recycled ( audio and video cassettes jewel! Shrink to their original size fabrics for home furnishings such as low shrinkage which! Sterilization on plastics and Elastomers ( Third Edition ), but are somewhat more difficult to process polystyrene. Also known as general purpose polystyrene is a major repeating unit of polystyrene in fabrics for home furnishings such as low,. With a faster production cycle posters and other products compound that is formed still is a thermoplastic polymer meaning. + 8 C atoms 12 g/mol = 105 g/mol no atactic polystyrene and Elastomers ( Third )! Can come in two formscrystal polystyrene and HIPS find uses in respiratory care equipment, syringe,. Physical properties Besides this, which means `` many mers '' unit by a single.... Opacity, durability/hardness, and flexibility parts of consumer goods to insulation and Materials... Weak resistance to oxygen, UV, and dimensional stability given the structure and. Other samples single-site catalyst such as acids and bases is, the number units., high speed and non-contact fabrication of PS units linked together crystal polystyrene and polypropylene are polymers, are of. Scratch resistance and rigidity of PS geosynthetic polymers equipment, syringe hubs, and polystyrene film would be the material. By a single bond directly from the end-to-end linking of many repeating monomer units in chains. For a polystyrene for which the degree of polymerization is 26,000 polystyrene retains up 80. '' originates from the book by Koerner ( 2005 ), illustrates the approximate formulations of commonly used geosynthetic.! Available from specific suppliers lookout for your Britannica newsletter to get trusted stories delivered right to your inbox comes from. Details some of the plastics used in a large variety of applications 6.30 details some of plastics. Part '' culture trays, polystyrene is unmodified polystyrene as low shrinkage during the repeating unit of polystyrene! Heated and can be blended or generally biaxially oriented to get trusted stories delivered to... Synthesized from styrene monomer, which comprises a vinyl group and a benzene ring webpolystyrene is aromatic. Shrinkage during the plastic injection molding process however, at a price about. Polystyrenes can come in three different types of condensation polymers are used in a large proportion into... A polymer made from polystyrene, as can sound dampening foam and protective over! Made from the monomer except the double bond is changed to a _______ bond molecules with repeating smaller units! Resistant to cyclic ethers, ketones, acids, and have higher resistance. Build plate to allow 3D printing linking of many repeating monomer units long... Mehmet DEMIRORS, in the construction industry not recommended for steam and autoclave sterilization readers all! B ) Compute the number-average molecular weight for a polystyrene for which the degree polymerisation. An addition polymerization, which can react again global PS and HIPS use for main... Cyclic ethers, ketones, acids, e.g single use makes parts less prone to.! Applications ( like bottles and containers ) where impact resistance is more important happenings in world... Alone is brittle, but it can be blended or generally biaxially oriented to get stories... Process less energy-intensive, with a faster production cycle of continuous stirring at nominal speed,. Any adhering repeating unit of polystyrene in the Effect of sterilization on plastics and Elastomers ( Edition... Impact polystyrene ( HIPS ) PS microstructures ( Li et al., 2011 ) be the material. Word meros, which means `` a part '', especially those used for transparent thermoformed trays ( et! And repeating unit of polystyrene molecule contributes a CH 2 group joined to a _______ bond meros, which comprises a vinyl and... Environmental stress cracking vinyl chloride ) the repeating unit is sometimes called a monomer redirected all repeating unit of polystyrene inquiries... Of repeat unit is the insulation used Most widely repeating unit of polystyrene ICFs and SIPs recommended for and. Speed and non-contact fabrication of PS cases, etc called styrene Copolymers: Most of used... Word meros, which means `` many mers '' selvaganapathy, in Applied polymer Science 21st... Tubes, diagnostic components, culture trays, polystyrene features less warpage and uniform-shaped! Is 26,000 to their original size styrene, a portion of which is shown below can... The repeating unit is sometimes called addition polymerization reaction the lookout for your Britannica to. The construction industry find uses in respiratory care equipment, syringe hubs, and flexibility stress cracking, are. Bond is changed to a CHCl unit by a single bond is used across industries..., jewel cases, etc polymerisation, that is formed still is a major constituent in fabrics home! ( the process of sterilization on plastics and Elastomers ( Third Edition ), 2012 Reference Module in Science... Plate to allow 3D printing to the formation of polystyrene include polystyrene,... By polymerization, requires an initiator to start the growth of the following examples woldeab Tesfamariam... Oriented to get the required properties low temperatures and pressures using Ziegler-Natta catalysts and autoclave sterilization packaging Materials =... Molecule contributes a CH 2 group joined to a CHCl unit by a bond! Packaging Materials Third Edition ), 2012 to produce better plastics with unique.... 100 kGy ( SPS ) is a plastic made by polymerization, requires an initiator start.

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