is the following : { NH – (CH2)5 – CO }n and M = 113 g/mol PD = 60‚000 / 113 = 531 The repeat unit of Nylon 6‚6 ( polyhexamethyleneadipate ) is : { OC(O) – (CH2)4 – CO – NH – (CH2)6 – NH } and M = 226 g/mol PD = 60‚000 / 214 = 265 -a) The polymer formed by the polycondensation of 2 moles of terephtalic acid and 2 moles ethyleneglycol is poly(ethyleneterephtalate) with the following repeat unit : { OC – C6H4 – C(O)O – CH2 – CH2 – O }n and M = 192/2 = 96
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G. INZELT‚ Charge Transport in Conducting Polymer Film Electrodes‚ Chem. Biochem. Eng. Q. 21 (1) 1–14 (2007) 1 Charge Transport in Conducting Polymer Film Electrodes G. Inzelt Eötvös Loránd University‚ Institute of Chemistry‚ Budapest‚ Pázmány Péter sétány 1/A‚ H-1117‚ Hungary E-mail: inzeltgy@chem.elte.hu Review Received: August 4‚ 2006 Accepted: December 13‚ 2006 The essential features of charge transport in conducting polymer film electrodes are discussed. Selected experimental results
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HOMEMADE BOUNCY POLYMER An Entry for the 2009 DIVISION SCIENCE FAIR TEAM CATEGORY CHINKEE MAE M. ALANZALON Grade VI – Jose Rizal DAN ALFONSO VALENTIN V. SORIA TRISHA KATE E. GENERAL Grade V – E. Aguinaldo Researchers Mr. MARK ANTHONY R. CUA Research Adviser Marcela Marcelo Elementary School Pasay City October 2009 CHAPTER 1 INTRODUCTION One might think that chemists are a bunch of boring scientists who wear lab coats and look at beakers all day‚ but did you know that many toys you play with
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#4 The Synthesis of Organic Polymers CHM2123‚ Section C October 21‚ 2014 Introduction: Organic polymers are macromolecules that are composed of smaller molecules called monomers. There are two main groups of polymers: natural polymers and unnatural (synthetic) polymers. Natural polymers include proteins such as cellulose and starch and are a necessity for our existence. On the other hand‚ synthetic polymers such as the polycarbonate in our lab goggles are
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* PLASTIC POLLUTION | | 0.0 (0) | Written by rashmi October 06‚ 2010 Hits: 368 0 Cash Credits: 25.00 Editor: Deepti The pollution that is caused by organic polymer materials such as plastic on the environment thereby having harmful effect on human being is known as plastic pollution. Plastic mainly can be divided in two broader classifications namely. * Thermoplastics * Thermosetting plastics Both these varieties of plastics are not biodegradable that cannot
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temperature of different polymers 8.1 Compare and comment on the results obtained. LDPE has the lowest average melting temperature (103.6°C) out of the 4 polymers. It is because LDPE is a linear polymer that has a branched structure which is able to expel the applied heat faster through the “branches” and melt faster. HPDE has the second lowest average melting temperature (139.5°C) out of the 4 polymers. Unlike LDPE‚ HDPE does not have a branched structure and the HPDE polymer chains are able to pack
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ELVAX 150W AND TOTAL HIPS 4440 POLYMERS ARE SAFE AND EFFECTIVE Our device’s Elvax® 150w and Total HIPS 4440 polymers provide a safe and effective product. HISTORY: Our oral device is made of two polymers‚ Elvax® 150w and Total HIPS 4440‚ used for a variety of purposes for decades. Since developing the first synthetic fiber--nylon--from research on large molecules called polymers‚ DuPont has remained a leader the field. In addition to Elvax®‚ DuPont makes high impact polystyrene (HIPS)
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Project 1: Polymer Ball Vivian Kim General Chemistry 2045L Introduction Our assignment in this project was to create a bouncy ball for a company using polyvinyl alcohol (PVA)‚ polyvinyl acetate solid and sodium borate‚ by varying the ration of ingredients and to determine the best recipe for our bouncy ball. The company chose the materials because of their odorless and nontoxic properties. PVA is a water-soluble synthetic polymer and has adhesive properties
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consists of polyhydroxyalkanoate‚ which contain two monomers 3-hydroxybutyrate and 3-hydroxyvalerate. Bacteria growing in tanks with a carbon-based food source in which the polymer is then isolated and purified presently produce the polymer industrially. Biotechnology has been recently used to economically attempt produce the polymer using genetic engineering technique. The advantages of this process are faster growth‚ better yields‚ easier recovery‚ and production of less extra waste biomass and cheaper
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cotton plant . The fiber is most of the time spun into thread and used to make a soft but strong textile. Cotton is a valuable crop because only about 10% of the raw weight is lost in processing. Once natural wax‚ protein‚ and other unnecessary things are removed‚ what’s left is a natural polymer of pure cellulose. Cellulose is the structural component of the cell walls of green plants‚ many forms of algae and the oomycetes. Some species of bacteria separate it to form biofilms. Cellulose is the
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