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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Polymerization reaCTIONS polymers are high-molecular-weight compounds‚ fashioned by the aggregation of many smaller molecules called monomers. Ex. plastics that have so changed society and the natural and synthetic fibers used in clothing are polymers. Classification of polymers Homopolymers - consist of repeated long chains or structures of the same monomer unit. Ex. PVC(polyvinyl chloride) Copolymers - polymers that consist of more than one molecule. Trimers - molecules consisting
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CYL458: Biomaterials History of biomaterials Yashveer Singh‚ PhD Department of Chemistry 20 May 2014 1 Suggested readings Biomaterials – The Intersection of Biology and Materials Science‚ JS Temenoff and AG Mikos‚ Prentice Hall‚ 2009 Biomaterials Science: An Introduction to Materials in Medicine‚ BT Ratner‚ AS Hoffman‚ FJ Schoen‚ JE lemons (Eds)‚ CRC Press‚ Boca Raton‚ FL‚ 1996 2 History of biomaterials http://northwestportlanddental.com/d ental-services/restorative-dental-care/
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Mechanical Family Planning There are various forms of mechanical contraceptives that act as barriers to block sperm from entering the uterus‚ thus preventing conception. Condoms are among the most common form of contraception. Mechanical methods of birth control‚ also known as barrier methods‚ are among the most common forms of contraception. Some of them‚ like condoms‚ are also the only methods that also reduce the risk of sexually transmitted diseases and HIV. All mechanical methods of
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Introduction PBDE’s are chemicals used extensively in several consumer products around the world. They are mainly flame-retardants and are found in consumer goods such as electrical equipment‚ construction materials‚ coatings‚ textiles and polyurethane foam (furniture padding) http://clinmedres.org/content/1/4/281.short. Similar in structure to polychlorinated biphenyls (PCBs)‚ PBDEs resist degradation in the environment. PBDEs were typically produced commercially at three different levels of bromination;
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Overview of the Current System and Related Systems Current System The proposed system lets the students view or print their transcript of records‚ statement of accounts‚ schedule of subjects and account balances without the need to request for these documents or log-in to their Integrated University Information System (IUIS) accounts. The current system in requesting for transcript of records and statement of accounts needs a request form or order of payment. The student then pays the specified
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Outer skin: Inner skin: Insulation: Framework Roof: Handles: Drainable floor floor with checkered plate Baseframe Conduit for wiring Acoustic insulation: (M) [Hz] [dB] Frame with panels Std 60 Galvanised prepainted 0.6 [mm] Galvanised 0.6 [mm] Polyurethane 45 [kg]/m³ anodized aluminium Not available nylon Not available Not available Galvanised Not available 63 6 125 8 250 8 500 13 Classification according to EN1886 Mech. strength: Leakage -/Leakage +: Filter by-pass Transmittance: Thermal bridges:
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MaKayla McKnight Eng 102 Amanda Morris November 12‚ 2014 Contraceptives Should Be Offered In Schools About 3 in 10 teen girls in the U.S become pregnant before the age of 20‚ it doesn’t have to be that way. Birth control and other contraceptives should be offered in schools to teens. Having these contraceptives available in school-based clinics are giving our most vulnerable students a chance to prevent future pregnancies and educate students how to practice safe sex. This would not only be benefiting
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"We don ’t make a lot of the products you buy. We make a lot of the products you buy better.®" An Exemplar Marketing Company Executive Summary BASF the chemical company is a provider of chemicals that has operations on five continents selling intermediates to various different industries. Founded in Manheim Germany in 1865 BASF has continually been on the move growing its presence globally. Aggressive expansion in the 1960’s led to
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of Abbreviations C2C C2G DfE EQAT MBDC PVC TPU Cradle to Cradle Approach Cradle to Grave Approach Design for Environment Environmental Quality Action Team McDonough Braungart Design Chemistry consulting Polyvinyl chloride Thermoplastic polyurethane Sustainability Along the Global Supply Chain 1 1. Introduction Founded in 1905‚ throughout the time Herman Miller has become a leader of residential and office furniture. During the entire span of its long-time existence‚ it has been precisely
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