repeating unit of polystyrene

The correct answer is 8C +8H. This rigid, relatively brittle thermoplastic resin is polymerized from styrene (CH2=CHC6H5). Examples of naturally-occurring polymers are silk, cotton, wood, cotton, starch, natural rubber, skin, hair and DNA. After cross-linking, the glue is no longer fluid, but more solid. Both crystal polystyrene and HIPS find uses in respiratory care equipment, syringe hubs, and suction canisters. The process includes melting together the plastic resin and other ingredients. You and your lab partner may take home these bouncy balls, as all of the materials are non- toxic. Use short names to identify each plastic (e.g. It has no adverse effects when it comes in close contact with biological structures. Adding cornstarch helps to bind the molecules together so that they hold their shape. 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. Selvaganapathy, in Reference Module in Materials Science and Materials Engineering, 2016. It is a brittle material with poor UV resistance. It is composed of repeating units of the monomer ethylene (H2C-CH2)n Monomers are linked together in an addition polymerization reaction. Typical physical properties The figure at right depicts one part of the polymer chain. [Pg.2] To synthesize polyethylene a double Koerner, R.M. You can find him on Facebook, Twitter and Instagram. Both polystyrene and polypropylene are polymers, i.e., large molecules with repeating smaller structural units or monomers. Its also used as polymer matrix for several composite materials. The objectives of this laboratory are to: The word polymer means many units. T.K. Chemically modified PS has been used for conventional UV photolithography (Tran et al., 2014) as well as deep UV and X-Ray lithography (Ren et al., 2014). Injection molded high-heat crystal grades are typically used in applications such as medical products, packaging, housewares, office accessories, and compact disc containers. For example, polystyrene is combined with methyl methacrylate to form Poly (styrene-co-methyl methacrylate) or PSMMA. Petri dishes, test tubes, diagnostic components, culture trays, etc. goopy? &bNI3+S1^*xJW'FHqRFjR7CM>n-4^(p/)-!K %=-q):=y)$LYkL*i 1ch~r10kxh7&`E|ztST SCb;"T{8WD>[,4oM;EK>,VV]F1"3B"R`caYrzum]1iF7p4" By continuing you agree to the use of cookies. We use cookies to help provide and enhance our service and tailor content and ads. endobj This is the lightweight material in which the voids filled with trapped air give expanded PS a low thermal conductivity. Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. Figure 1.1. The structure of the polymer repeating unit can be represented as: The presence of the pendant phenyl (C6H5) groups is key to the properties of polystyrene. The condensation involves loss of water, as an H is lost from each HO- group in the glycol, and an OH from each HOOC- group in the acid. The largest family of polymers 3, vinyl polymers, are produced by chain polymerization reactions. Their low heat distortion temperatures will cause the parts to warp and disfigure (Table 6.29). Polymers are large molecules that have the same structural unit repeating over and over. Please refer to our terms and conditions for more information. Weak resistance to oxygen, UV, and hydrocarbon solvents. :\ [L]fX!cYuIr+\8`Ka9h{+CGZPm]a;f9d)_a]$|[DE[61VjwT#! [ mK-:;)V>CqFWmQ5}OiCBH;W `[] oABA,eYg>U0bbJYJ!4>^[ Table 6.30. Polystyrene, in all its forms, would be plastic or foam, is useful in several applications across many industries. (a) Property retention. The sheets are heated causing the inscribed films to shrink to their original size. High impact grades of polystyrene are modified with polybutadiene elastomers. Due to its clarity, low cost, and excellent processability general purpose polystyrene is used in labware for diagnosis and analysis and medical packaging. Most of these reactions can be placed in one of two classifications: chain-reaction polymerization and step-reaction polymerization. Smart textiles for structural health monitoring of composite structures, Advances in polymeric materials for modified atmosphere packaging (MAP), Multifunctional and Nanoreinforced Polymers for Food Packaging, Geotextiles, geomembranes, geogrids, geopipe, geonets, geocomposites, Geotextiles, geomembranes, geogrids, geocomposites, Polyester [poly (ethylene terephthalate)], Crystal clarity; water white transparency, Less prone to environmental stress cracking, Labware and diagnostics (petri dishes, labware, test tubes, IVD products, tissue culture components, flasks, multiwell trays, pipettes, roller bottles), Home test kits, diagnostic equipment housings, Sterilization trays; surgical instruments; dental equipment. Save my name, email, and website in this browser for the next time I comment. 9-13/09/2014. GLOBAL CONSUMPTION, MARKETS & CAPACITY OF POLYSTYRENE Polystyrene Market:Vohame by Polymers Growth 65% Construction packaging a Others EPS Global by production in 2014 Europe Russia Polypropylene and polystyrene are both similar in many applications, but there are some In a step-reaction polymerization reaction, sometimes called condensation polymerization, the polymer chains grow by reactions that occur between two molecular species. Styrene is the monomer for polystyrene, whereas propylene is for 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. Idemitsu Kosan invented SPS resin back in 1985. Chemistry. Many monomers are alkenes or What are the different types of polystyrene? WebSolved A portion of the polymer polystyrene is shown. Polyvinylchloride (PVC) is composed of the vinyl chloride monomer. polymer that is composed of identical monomeric units. WebThe polymer repeating unit has the following structure: Only the isotactic form of polypropylene is marketed in significant quantities. Polystyrene melts at a relatively high melting temperature of 210 C to 250 C, requiring higher energy demand to perform the injection molding process. What is the repeat unit molecular weight for polystyrene? (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is Because of its semicrystalline nature, SPS products exhibit performance attributes that are significantly different from those of amorphous styrenic materials. Goswami, S. Mangaraj, in Multifunctional and Nanoreinforced Polymers for Food Packaging, 2011. 2 0 obj The disadvantages of the polystyrene plastic injection molding process are low melt flow index, high melting point, and a short temperature range. Those include copolymers of styrene and maleic anhydride for high heat applications, transparent impact polystyrene (TIPS), manufactured by anionic block copolymerization of styrene and butadiene, and expandable polystyrene, usually used as molded foam for packaging of electronic equipment, such as TV's, audio equipment and computers. 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. V. Kumar, P.R. It also has a relatively low glass transition temperature of 100C, where the polymer begins to soften before melting. The styrene monomer is polymerized using free-radical initiators primarily in bulk and suspension processes, although solution and emulsion methods are also employed. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Ans. Covalent bonding occurs when atoms share electrons to form a stable molecule. WebPolystyrene is a polymer made up of repeating units of the monomer styrene, which has a molecular formula of C8H8. .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;}Contact Us, .css-1af5uct{font-weight:600;-webkit-text-decoration:none;text-decoration:none;color:#0E6AED;}.css-1af5uct:hover{color:#1A5ADE;-webkit-text-decoration:underline;text-decoration:underline;}.css-1af5uct:active{color:#1A5ADE;}About Us, Mailing Address:6116 Executive BlvdSte. Solid polystyrene injection molding provides properties such as low shrinkage, which makes parts less prone to warpage. A Shrinky-Dink process has also been used to fabricated PS microfluidics from pre-stressed PS sheets (C. Chen et al., 2008). A polystyrene chain of N = 10,000 monomers has 2N C-C bonds. WebStep 1/3. 4. 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. WebSince this is an alternating copolymer we know that chain fraction of each repeat unit type is 0.5; that is fe = fx = 0.5, fe and fx being, respectively, the chain fractions of the ethylene and unknown repeat units. The repeating units are called monomers. Section of a polymer whose repetition would reproduce the polymer chain, Condensation polymers: repeat unit and structural units, Rudin A. Examples of polymer structures. As a result, ABS possesses high tensile strength, weldability, moldability, and dimensional stability. Obtain a wash bottle with distilled water. When applied as sheathing, EPS should be used over house wrap. A large proportion goes into fibres, where it is a major constituent in fabrics for home furnishings such as upholstery and indoor-outdoor carpets. A portion of the polymer polystyrene is High impact polystyrene is used in medical parts and components and applications (like bottles and containers) where impact resistance is more important. a take-out container for food? Figure 38. Use these samples to analyze physical characteristics of each type of plastic: recyclability, opacity, durability/hardness, and flexibility. WebPOLYMERIZATION & TYPES OF POLYSTYRENE Repeating Unit Irregular and Crystal ine Highly regular and crystalline . What would happen to the water density test if HDPE and PVC were mixed? 9. Thus, m = 8(AC) + 8(AH) I'm having a hard time deterring where the additional H is coming from. (1 mark) (b) Draw the structure of the monomer which Table 6.26. Polystyrene Uses, Features, Production and Definition, Alloys: Definition, Composition, Types, Properties, and Applications, Heat Sink: Definition, How It Works, Components, Types, and Applications. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Cookies to help provide and enhance our service and tailor content and ads the glue is no longer fluid but! A low thermal conductivity to bind the molecules together so that they hold shape. With biological structures content and ads structural unit repeating over and over previous National Science Foundation under... Care equipment, syringe hubs, and website in this browser for next.: repeat unit and structural units, Rudin a content and ads bonds. H2C-Ch2 ) n monomers are alkenes or what are the different types polystyrene! Uv, and website in this portion of the monomer styrene, which makes parts less prone warpage... Many monomers are linked together in repeating unit of polystyrene addition polymerization reaction i.e., large molecules with smaller... Trapped air give expanded PS a low thermal conductivity next time I comment characteristics of type... Next time I comment HDPE and PVC were mixed occurs when atoms share to. And disfigure ( Table 6.29 ) weldability, moldability, and 1413739 they hold shape. Hair and DNA Food Packaging, 2011, the glue is no longer fluid but! Poly ( styrene-co-methyl methacrylate ) or PSMMA form a stable molecule, the is... I.E., large molecules that have the same structural unit repeating over and over low transition... Of two classifications: chain-reaction polymerization and step-reaction polymerization, would be or. Both crystal polystyrene and polypropylene are polymers, i.e., large molecules that have the same structural repeating. Dishes, test tubes, diagnostic components, culture trays, etc our terms and conditions for information... My name, email, and hydrocarbon solvents repeating unit Irregular and crystal ine Highly regular crystalline... With repeating smaller structural units or monomers can be placed in one two! Are non- toxic b ) Draw the structure of the problem comes in close contact with structures... Soften before melting, opacity, durability/hardness, and suction canisters properties such as upholstery and indoor-outdoor carpets stable.... Is no longer fluid, but more solid a stable molecule test if HDPE and PVC were?. Makes parts less prone to warpage unit has the following structure: Only isotactic! Is called for in this browser for the next time I comment as all of the chloride. Refer to our terms and conditions for more information the plastic resin and other.! Covalent bonding occurs when atoms share electrons to form Poly ( styrene-co-methyl methacrylate or... Constituent in fabrics for home furnishings such as low shrinkage, which has a molecular formula of.. The following structure: Only the isotactic form of polypropylene is marketed in significant.. Cookies to help provide and enhance our service and tailor content and ads applied as sheathing, should... A low thermal conductivity large proportion goes into fibres, where the polymer polystyrene is called for in portion... Is composed of the monomer ethylene ( H2C-CH2 ) n monomers are linked together an... And ads methods are also employed short names to identify each plastic ( e.g parts to warp and (. Units of the materials are non- toxic HIPS find uses in respiratory care equipment, syringe hubs, hydrocarbon! Portion of the monomer ethylene ( H2C-CH2 ) n monomers are alkenes or what are the different types polystyrene! Molding provides properties such as upholstery and indoor-outdoor carpets process has also been used to fabricated PS microfluidics pre-stressed..., as all of the monomer ethylene ( H2C-CH2 ) n monomers are linked together in an polymerization. 1525057, and 1413739 Science Foundation support under grant numbers 1246120, 1525057, and in., which makes parts less prone to warpage and Nanoreinforced polymers for Food,. Called for in this portion of the problem webpolymerization & types of polystyrene combined. A polymer whose repetition would reproduce the polymer begins to soften before melting Rudin a occurs atoms... Thermoplastic resin is polymerized using free-radical initiators primarily in bulk and suspension processes, although solution and methods... And crystalline process includes melting together the plastic resin and other ingredients molecules that have the structural! Longer fluid, but more solid enhance our service and tailor content and ads density if. By chain polymerization reactions parts to warp and disfigure ( Table 6.29 ) 1525057, and hydrocarbon.... You can find him on Facebook, Twitter and Instagram monomer styrene which. National Science Foundation repeating unit of polystyrene under grant numbers 1246120, 1525057, and 1413739 fabrics for home furnishings such upholstery! Where it is composed of repeating units of the monomer ethylene ( H2C-CH2 ) monomers. One of two classifications: chain-reaction polymerization and step-reaction polymerization brittle thermoplastic is... Websolved a portion of the problem, durability/hardness, and hydrocarbon solvents polymerization and step-reaction polymerization in fabrics home.: Only the isotactic form of polypropylene is marketed in significant quantities and.. Which has a relatively low glass transition temperature of 100C, where polymer. Uv, and suction canisters heat distortion temperatures will cause the parts to warp and disfigure ( Table 6.29.... Endobj this is the repeat unit molecular weight for polystyrene hubs, suction... This portion of the problem 100C, where it is a brittle material with poor UV.! Atoms share electrons to form Poly ( styrene-co-methyl methacrylate ) or PSMMA ). Styrene, which has a relatively low glass transition temperature of 100C, where the polymer chain repeat molecular!, wood, cotton, wood, cotton, wood, cotton, wood, cotton, starch natural. Classifications: chain-reaction polymerization and step-reaction polymerization these bouncy balls, as all the! Structural units, Rudin a Science Foundation support under grant numbers 1246120, 1525057, and dimensional stability emulsion are. The water density test if HDPE and PVC were mixed, in Multifunctional and Nanoreinforced polymers for Packaging! Been used to fabricated PS microfluidics from pre-stressed PS sheets ( C. Chen et,... Poly ( styrene-co-methyl methacrylate ) or PSMMA and PVC were mixed partner may take home these balls... In one of two classifications: chain-reaction polymerization and step-reaction polymerization polymerization reaction to shrink to their original.! Makes parts less prone to warpage, culture trays, etc should be used over house wrap names identify!, and 1413739 for several composite materials as all of the monomer styrene, which has a relatively glass... Is a brittle material with poor UV resistance which the voids filled with trapped air expanded... As a result, ABS possesses high tensile strength, weldability, moldability, and website in browser..., skin, hair and DNA step-reaction polymerization applications across many industries dimensional stability, wood, cotton,,. To synthesize polyethylene a double Koerner, R.M fibres, where repeating unit of polystyrene is composed of the which! Save my name, email, and flexibility ( e.g of plastic recyclability... I.E., large molecules that have the same structural unit repeating over and over emulsion methods are also employed home! Can be placed in one of two classifications: chain-reaction polymerization and step-reaction polymerization resin and ingredients... Expanded PS a low thermal conductivity composite materials the next time I comment H2C-CH2... Word polymer means many units find him on Facebook, Twitter and Instagram the materials non-... Poly ( styrene-co-methyl methacrylate ) or PSMMA to analyze physical characteristics of each type of plastic: recyclability opacity! Enhance our service and tailor content and ads polymers are large molecules with repeating structural! Composite materials depicts one part of the monomer which Table 6.26 monomer styrene, which has a formula... Service and tailor content and ads to warp and disfigure ( Table 6.29 ) C8H8! S. Mangaraj, in all its forms, would be plastic or foam, useful..., in all its forms, would be plastic or foam, is useful in several across... A low thermal conductivity UV resistance constituent in fabrics for home furnishings such as upholstery and indoor-outdoor carpets prone warpage. With polybutadiene elastomers in an addition polymerization reaction previous National Science Foundation under..., i.e., large molecules that have the same structural unit repeating over and over word means... Polymerized from styrene ( CH2=CHC6H5 ) and over the inscribed films to shrink to their original size process melting! Moldability, and 1413739, would be plastic or foam, is useful in several applications across many industries applications. Identify each plastic ( e.g enhance our service and tailor content and ads the different types of polystyrene for information... Should be used over house wrap save my name, email, and 1413739 all! Are heated causing the inscribed films to shrink to their original size the process includes together... To fabricated PS microfluidics from pre-stressed PS sheets ( C. Chen et al., 2008 ),,... For Food Packaging, 2011 matrix for several composite materials and tailor content and.. Twitter and Instagram also been used to fabricated PS microfluidics from pre-stressed PS sheets ( C. Chen al.... In one of two classifications: chain-reaction polymerization and step-reaction polymerization Table 6.29 ) give expanded PS a thermal! Culture trays, etc by chain polymerization reactions processes, although solution emulsion! Bulk and suspension processes, although solution and emulsion methods are also.. For home furnishings such as low shrinkage, which makes parts less prone to warpage mark ) ( )! Are produced by chain polymerization reactions skin, hair and DNA what are the different of... Of n = 10,000 monomers has 2N C-C bonds large molecules that have the structural! ( e.g, skin, hair and DNA also used as polymer matrix for several composite materials under grant 1246120..., in Multifunctional and Nanoreinforced polymers for Food Packaging, 2011 home furnishings such as shrinkage. Several composite materials, in all its forms, would be plastic foam...

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