Aiming to prove that commercial, 50°CPVC consists of a dual population of chains, has led us to the investigation of the thermal stability of low conversion (0,1–2%) PVC. Bulk polymers prepared at very low conversion levels were shown to be different to high conversion material. The former are more syndiotactic, and have a greater tendency to be less thermally stable, unzippering to long polyene sequences (with n > 15). These findings are consistent with the idea that initially‐produced PVC is formed by homogeneous polymerisation and that such material is intrinsically different to PVC which is formed at subsequently higher conversions by a heterogeneous route.
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Cuthbertson et al. (1987) studied this question.
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