Abstract
Models for unsaturated endgroups in PVC (viz 3-chloropentene-1, 1-chloropentene-2, 2,3-dichloropentene-1, 1,3-dichloropentene-1, 1,2-dichloropentene-2 and 2,4-dichloropentene-1) were reduced with LiAlH 4 in THF. Gas chromatographic, i.r. and NMR analyses of the products showed that the chlorine atoms attached to saturated carbon atoms are substituted by hydrogen atoms during the reduction, while those attached to carbon atoms linked by double bonds are not changed. By Cotman's reduction method, the double bonds are not reduced. Therefore the branching degree determined by methods based on measurement of CH 3 groups in reduced PVC must be corrected so that the nature and number of unsaturated end-groups are taken into account. Some of these groups can be determined by measurements on the reduced polymer.
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