✦ LIBER ✦

The gel-sol transition of dilute poly(vinyl chloride) gels in phthalate plasticisers

✍ Scribed by S.A. Leharne; G.S. Park

Publisher: Elsevier Science
Year: 1985
Tongue: English
Weight: 271 KB
Volume: 21
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(85)90195-8

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✦ Synopsis

The gel melting points, Tin, of PVC gels in five dialkyl phthalates have been obtained for gels set at temperatures between 0 and 50c'C and for PVC concentrations between 40 and 100 g 1 ~. Tm increases with increasing size of the phthalate, with increasing concentration, c, of the polymer and with decreasing setting temperature of the gel. The effect of phthalate size is as predicted by Flory's theory of the effect of solvents on polymer melting points; the variation with concentration satisfies the Eldridge and Ferry relationship:

In c = const. + AHx/RT m which enables the heat of formation of network junction points, AH X, per network chain to be obtained. The increase in T,~ I with decreasing setting temperature correlates with an increase in -AHx.

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