Ch_322a_10.014

Ch_322a_10.014 - Free Radical Polymerization of Alkenes...

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Free Radical Polymerization of Alkenes Polymers are very large molecules (macromolecules) made up of repeating units. The structural units that react to form the macromolecules are called monomers . One important way to carry out polymerization is by free radical addition to alkenes wherein the intermediate alkyl radicals continue to add alkene units. Polyethylene One of the most important commercial polymers is polyethylene , which is produced by the polymerization of ethene. Annual production in the United States is close to 60 billion pounds. m CH 2 =CH 2 polymerization ethene (a monomer) ~CH 2 CH 2 -(CH 2 CH 2 ) n - CH 2 CH 2 ~ polyethylene (a polymer) where m and n are in the tens of thousands
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The Mechanism of the Free Radical Polymerization of Ethene Polyethylene may be produced by heating ethene at 1000 atm of pressure with a small amount of an organic acyl peroxide. R-C-O-O-C-R O = O a diacyl peroxide The O-O bond is very weak in acyl peroxides. initiation
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Ch_322a_10.014 - Free Radical Polymerization of Alkenes...

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