POLYMER COCNCRETE 1. Introduction Despite being thought of as a modern material‚ concrete has been in use for hundreds of years. The word concrete comes from the Latin concretus‚ which means “mixed together” or compounded. Concrete is an extremely popular structural material due to its low cost and easy fabrication. Concrete is made up of sand or stone‚ known as aggregate‚ combined with cement paste to bind it. Aggregate can be of various sizes. It is broadly categorized as fine (commonly
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Case Study: Change at Dupont Abstract Plant Manager‚ Tom Harris greeted everyone by name when he walked through the plant and as far as one could tell‚ it seemed to be business as usual at DuPont. Most recently‚ Orion‚ a DuPont manufacturing operation had been closed‚ the equipment dismantled and sent to China‚ but there were no particular concerns regarding this change. When Tom contacted the University of Virginia‚ he was not looking to solve any particular problem; rather he sought to gather
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Case Study – “Change at DuPont” Leading Organizational Change Jun 2‚ 2011 Abstract A popular cliché stated that‚ “Nothing is permanent except change”. As such‚ it is imperative for organizations to have a smooth transition from constancy to revolutionary. Organizational Development‚ Appreciative Inquiry‚ and Sense making have a profound embedment on the DuPont scenario‚ and was seen as compatible and synergistic to each other. The scenario shows that these new trends have a better
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DuPont Analysis A type of analysis that examines a company’s Return on Equity (ROE) by breaking it into three main components: profit margin‚ asset turnover and leverage factor. By breaking the ROE into distinct parts‚ investors can examine how effectively a company is using equity‚ since poorly performing components will drag down the overall figure. To calculate a firm’s ROE through Du Pont analysis‚ multiply the profit margin (net income divided by sales)‚ asset turnover (sales divided
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Chapter 9 The World of Plastics and Polymers Overview • Plastics are all around us – Polymers‚ materials whose molecules consist of long chain of atoms • Natural • Synthetic • Use of material and impact on economy‚ lifestyle‚ and leisure – Word plastic to some carry connotation “cheap” or “tacky” – Synthetic polymers revolutionised modern life • eg plastics become important in automobile industry‚ some new plastics stronger than steel and resist corrosion‚ less dense than structural
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Biodegradation is the breakdown of polymer by microbial organism such as bacteria‚ fungi etc. into smaller compounds. The microbial organisms degrade the polymer through metabolic or enzymatic processes. Synthetic plastics are resistant to degradation‚ and consequently their disposal is fuelling an international drive for the development of biodegradable polymers. A variety of natural‚ synthetic‚ and biosynthetic polymers are bio and environmentally degradable. A polymer based on a C-C backbone tends
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yChapter 3. Polymer Processing Polymer Process Techniques Fig. 3.1. Procedure for casting sheets of polymer. Polymer Materials Page 2 Polymer Process Techniques HEMA = hydroxyethyl methacrylate EGDMA = ethylene glycol dimethacrylate Fig. 3.2. Centrifugal mold for poly(hydroxyethyl methacrylate) contact lenses Solvent casting of films Fig. 3.3. Laboratory spreading device for the solution casting of films. Polymer Materials Page 3 Polymer Process Techniques
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CONDUCTING POLYMERS By Colin Pratt INTRODUCTION Until about 30 years ago all carbon based polymers were rigidly regarded as insulators. The idea that plastics could be made to conduct electricity would have been considered to be absurd. Indeed‚ plastics have been extensively used by the electronics industry because of this very property. They were utilized as inactive packaging and insulating material. This very narrow perspective is rapidly changing as a new class of polymer known as intrinsically
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E.I du Pont de Nemours & Co.: Titanium Dioxide Group#: 7 Lu Yu Yang Hu You Wang 1 1. There are basically three technologies to produce TiO2: sulfate process‚ rutile chloride process and ilmenite chloride process. Most of Du Pont’s competitors‚ such as NL Industry‚ mainly used sulfate process‚ which require lowgrade feedstock and produce a large amount of waste. This process will cost the
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the anti-clotting medication‚ Plavix. To continue to focus on pharmaceuticals‚ in the early years of 2000-2002‚ the company divested many of their non-pharmaceutical divisions‚ such as Clairol and the Mead-Johnson Nutritional division‚ and purchased DuPont Pharmaceuticals as well as an almost 20% share of ImClone Systems‚ which was getting ready to release a new anti-cancer drug‚ Erbitux (SEC eyes Bristol-Myers‚ 2002). In April of 2002‚ the trouble for BMS began with an SEC investigation into their
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