Polypropylene (PP)‚ also known as polypropene‚ is a thermoplastic polymer used in a wide variety of applications including packaging and labeling‚ textiles (e.g.‚ ropes‚ thermal underwear and carpets)‚ stationery‚ plastic parts and reusable containers of various types‚ laboratory equipment‚ loudspeakers‚ automotive components‚ and polymer banknotes. An addition polymer made from the monomer propylene‚ it is rugged and unusually resistant to many chemical solvents‚ bases and acids. Most commercial
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meros=part). Usage The term macromolecule was coined by Nobel laureate Hermann Staudinger in the 1920s‚ although his first relevant publication on this field only mentions high molecular compounds (in excess of 1‚000 atoms).At that time the phrase polymer‚ as introduced by Berzelius in 1833‚ had a different meaning from that of today: it simply was another form of isomerism for example with benzeneand acetylene and had little to do with size. Usage of the term to describe large molecules varies among
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States. Some plastics use cornstarch as an additive. This additive helps in the natural decomposition of the plastic materials. Cassava is basically composed of starch. Cassava starch is composed of two components: amylose and amylopectin. An amylose is a long straight chain of polymer of anhydroglucose units. An amylopectin is a branched chain compound‚ also of anhydroglucose units. Because plastics are made of polymers‚ starch is a very favorable raw material in plastic-making. The study was limited
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“What’s Natural about Our Natural Products?” by Sarah Federman‚ Sarah talks about how the words “ nature “ and “ natural “ are being used to sell more products and seem “ healthy “. She goes on to discuss how the word “ natural “ has turned into a marketing asset. Federman shows readers that food companies‚ uses these words to manipulate consumers to buy more of their products. It is a technique that’s used for products like Kraft Cheese to get sales to go up. It is known that Kraft sells Natural Shredded
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PPV‚ which is the abbreviated term for phenylenevinylene‚ has light emitting properties since it has a large conjugated system. This organic molecule is possible to be formed from dichloro-para-xylene which then reacts with methanol and thiolane. The nucleophile would be the thiolane. A good leaving group in this case would be chlorine. After thiolane attacks‚ it results with dithiolane-xylene. The second step is reaction with sodium hydroxide. The hydroxide it used for deprotonation upon the substituted
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viscosity of the formulation increased with an increase in sodium alginate and pectin concentration (Table 5.3). This phenomenon is a consequence of increasing chain interaction with an increase in polymer concentration. The change in viscosity is proportional to the change in concentration and polymer ratio. The buoyancy lag time in simulated gastric fluid (0.1 mol L-1HCL‚ pH 1.2) varied with the formulation variables. Formulation P1 exhibited the least buoyancy lag time (26 s) while formulation
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change in properties of composites. Carbon-based materials and graphite nanoparticles in particular in general enhance electronic‚ optical‚ thermal and mechanical properties of polymer matrixes [6-11]. To synthesize electroconductive composites graphite nanoparticles were used as filler material in many insulating polymers‚ for example epoxy‚ polystyrene‚ poly(methyl methacrylate)‚ thermoplastic polyurethane and many others [8]. Such composites attracted significant attention
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2010CH10078 Gurvineet Singh Dhillon 2010CH10079 Gaurav Singh Sinsinwar 2010Ch10077 Polyimide is a polymer of imide monomers. The structure of imide is as shown. Polyimides have been in mass production since 1955. Typical monomers include pyromellitic dianhydride and 4‚4 ’-oxydianiline. Polyimides are a very interesting group of incredibly strong and astoundingly heat and chemical resistant polymers. Their strength and heat and chemical resistance are so great that these materials often replace glass
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Introduction Polytetrafluoroethylene (PTFE)‚ more commonly known as Teflon‚ is a polymer. Polymer is a substance which contains many structural units that are joined the same type of linkage.(1) Hence‚ the molecular structure of polytetrafluoroethylene is based on a chain of carbon atoms. However‚ unlike some other fluoropolymers‚ in Teflon the chain is completely surrounded by fluorine atoms.(2) There is a very strong bond between fluorine atoms and the carbon as the fluorine atoms act as a protective
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ORGANIC MACROMOLECULES 1. What is a polymer? 2. Man-made polymers have been studied since 1832. Today‚ the polymer industry has grown to be larger than the aluminum‚ copper and steel industries combined. Polymers already have a range of applications that far exceeds that of any other class of material available to man. Give examples where polymers are applied in each of these categories: a) Agriculture b) Medicine c) Consumer Science
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