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Chemistry polymers.
Member rating: No Rating | Words: | Submitted: Wed Nov 05 2003
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Emmanuel Ntombura 18/09/2003 CHEMISTRY - POLYMERS The crude oil fraction that polymers go into is the naphtha fraction. This fraction normally contains Alkanes. Ethene put under pressure and heated with a catalyst will polymerise to form poly (ethene). Note that there are no double bonds in the polymer. Poly (ethene) is an alkane. It is a saturated hydrocarbon. This process is called polymerisation. A polymer that is formed from monomers added together where no substance (other than the polymer) is produced is called an addition polymer. Examples of addition polymers are poly (ethene), poly (propene), poly (chloroethene) - PVC, and poly (phenylethene) - poly (styrene). The double bond in an alkene (like ethene) can be broken open and joined to other molecules. A molecule of ethene can be joined to another molecule of ethene. In the process, the second ethene molecule has its double bond broken, and this may be added to a third...
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