1.1 DEFINING POLYMERS Polymers are materials of very high molecular weight that are found to have multifarious applications in our modern society. They usually consist of several structural units bound together by covalent bonds [1‚2]. For example‚ polyethylene is a long-chain polymer and is represented by ÀCH2 CH2 CH2 À or ½ÀCH2 CH2 Àn ð1:1:1Þ where the structural (or repeat) unit is ÀCH2ÀCH2À and n represents the chain length of the polymer. Polymers are obtained through
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1. What does it mean when a polymer is crosslinked? Crosslinked is one manner in which monomers link together. In this method‚ separate polymer chains are connected via bonds between the individual polymer chains. 2. We discussed how polymer linking and structure contribute to its properties. How would you expect the density‚ elasticity‚ and rigidity of a polymer that is branched to compare to one that is linear? I would expect the density of the linear polymer to be much higher than the density
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Polymers in Dentistry A polymer is a very long molecule that is made by linking together many smaller molecules called monomers. Some polymers contain only one type of monomer and others can be made from a combination of two or more different monomers. Polymers can be synthetic (produced by humans) or natural. Polymers that can be heated and molded into specific shapes and forms are commonly known as plastics. All plastics are synthetic polymers. Adhesives‚ chewing gum‚ and polystyrene are also
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Polymer Chemistry Classification of Polymers – Notes prepared by The most common way of classifying polymers is to separate them into three groups - thermoplastics‚ thermosets‚ and elastomers5. The thermoplastics can be divided into two types - those that are crystalline and those that are amorphous. You may click on the words in the diagram below to learn more about these classifications. Thermoplastics Molecules in a thermoplastic are held together by relatively weak intermolecular
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WHAT IS THE DUPONT MODEL? DESCRIPTION The DuPont Model is a technique that can be used to analyze the profitability of a company using traditional performance management tools. To enable this‚ the DuPont model integrates elements of the Income Statement with those of the Balance Sheet. ORIGIN OF THE DUPONT MODEL. HISTORY The DuPont model of financial analysis was made by F. Donaldson Brown‚ an Electrical Engineer who joined the giant chemical company’s Treasury department in 1914
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DUPONT UNDERSTANDING THE CUSTOMER’S ACTIVITY CYCLE Submitted to: Dr. K.Abdul Waheed Submitted by Group 3- Case: Dominion Motors 1. Vaibhav Nigam 2. Varun Gupta 3. Utpal Garg 4. Sidhant Khunger 5. Mitali Runwal 6. Nidhi Agarwal 7. Konda Moulika 8. Sahil Chhabra INTRODUCTION: DuPont was established in the year
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PT. SEA LOG South East Asia Logistics Head Office: WTC Mangga Dua Lt. UG Blok. D No. 99 - 100 Jakarta Utara Telephone: +62 21 - 91943864 Fax: +62 21 - 30017831 Email: marketing@sea-log.com& cs_jkt@sea-log.com Website: www.sea-log.com ____________________________________________________________ __________________________ _ PT.SEALOG -“Connecting Islands‚ Connecting desires” The term “logistics” originates from the ancient Greek “λόγος” (“logos”—“ratio‚ word‚calculation‚ reason‚ speech
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Synthesizing Polymers “Making Silly Putty” In college‚ there are many things students take for granted. One thing we all take for granted the most is keeping a fresh perspective on the curriculum we are taking. This is an especially hard task when it comes to the more challenging subjects like science and mathematics. Chemistry‚ in particular is one of the most challenging subjects for any student‚ and many factors contribute to the students’ understanding of the course. Things like the right professor
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polypropylene Part A. Injection molding of polypropylene samples for mechanical testing. Introduction Injection molding is the most productive and popular polymer processing techniques. Almost 70% of all plastic parts are made using injection molding. Injection molding of plastics is a process similar to die casting of metals. Molten polymer is injected under pressure into a mold. Method Put the plastic material (Polypropylene) in granular form into the hopper. Set the injection molding
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Reference: To appear in: S0141-3910(10)00062-5 10.1016/j.polymdegradstab.2010.02.008 PDST 5967 Polymer Degradation and Stability Received Date: 17 December 2009 Revised Date: 2 February 2010 Accepted Date: 7 February 2010 Please cite this article as: Grause G‚ Ishibashi J‚ Kameda T‚ Bhaskar T‚ Yoshioka T. Kinetic studies of the Decomposition of Flame Retardant Containing High Impact Polystyrene‚ Polymer Degradation and Stability (2010)‚ doi: 10.1016/j.polymdegradstab.2010.02.008 This is a PDF file
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