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Vinyl polymers are a group of polymers derived from vinyl monomers. Their backbone is an extended alkane chain, made by polymerizing an alkene group (C=C) into a chain (..-C-C-C-C-..). In popular usage, "vinyl" refers only to PVC. Vinyl polymers are the most common type of plastic:
Other vinyl monomers with a 1,2-substitution pattern do as a general rule not polymerize due to steric hindrance it is thermodynamically still favorable. As an exception it was found  that the monomer fumaronitrile (related to fumaric acid and also to acrylonitrile but with an extra nitrile group) does polymerize but only in a very special way
A very thin film of monomer was prepared in a vacuum chamber on a tantalum substrate at -173°C and then photopolymerized. Due to the poor penetration depth of the radiation, thin polymer films with thickness several micrometres were obtained nevertheless with degree of polymerization in the 10,000 range. The polymerization is able to take place because the monomer molecules in the film are completely disorganized (isotropic) and therefore there is always a possibility for two monomers to react which they do not have in the crystalline phase.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Vinyl_polymer". A list of authors is available in Wikipedia.|