Ogboni (also known as Osugbo in Ijèbú) is a fraternal institution indigenous to the Yoruba language-speaking polities of Nigeria‚ Republic of Bénin and Togo. The society performs a range of political and religious functions‚ including exercising a profound influence on regents and serving as high courts of jurisprudence in capital offenses. Influence [edit] Though versions or lodges of this fraternal group are found among the various types of Yoruba polities——from highly-centralized kingdoms
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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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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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MOUNT VESUVIUS FACTS Mount Vesuvius is probably the most famous volcano EVER! I wrote a couple of interesting facts that you can copy and paste freely for your term paper or geography project. * Situated in Naples‚ Italy‚ Mount Vesuvius which is 19‚ 000 years old is a stratovolcano. This volcano can be recognized even from a distance‚ due to its characteristic feature of a ’humpback’ mountain. Volcanoes are classified according to their shapes and Mount Vesuvius is a stratovolcano.
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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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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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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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