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The Story of Poly(ethene) and Poly(propene).
Member rating: No Rating | Words: | Submitted: Wed Sep 17 2003
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The Story of Poly(ethene) and Poly(propene) The term "Addition Polymerisation" means when a reaction takes place where a polymer is created from its monomers without leaving other molecules behind. A monomer is a molecule that when joined up in long chains create a polymer. For example: the monomer of polyethylene is an ethylene molecule: CH2=CH2 When this molecule is joined up with other similar molecules it creates polyethylene, a polymer. CH2=CH2 + CH2=CH2 ? -CH2-CH2-CH2-CH2-CH2-CH2- ethene ethene polyethene piece When this reaction takes place nothing is lost as the monomers (i.e. ethene) join end-to-end forming no other products. The monomers double bond is opened to bond with other monomers. When Polyethene is produced there are two kinds, hdpe and ldpe. Ldpe is polymer molecules that contain branching. The carbons of an ldpe instead of having Hydrogen atoms they will have polyethene bonded to them. Under certain pressures (1500-3000 atmospheric pressures), temperatures (100-300°c) and using peroxide catalysts. These are...
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