Abstract
Poly(vinyl chloride) (PVC) is miscible with poly(vinyl pyrrolidone) (PVP) over the whole composition range. In this paper, we describe the specific interactions and degradation features in this blend system investigated by using Raman and Fourier transform infra-red (FTIR) emission spectroscopy. No appreciable hydrogen bonding between the amide groups in PVP and the αhydrogen in PVC is observed, but the presence of dipole-dipole interaction between C-Cl and OC leads to decreased association of PVP chains and good dispersion in PVC. Facile dehydrochlorination of PVC in the blends is promoted by PVP in that increasing the amount of PVP in the blends decreases the dehydrochlorination temperature. At elevated temperatures, there are longer sequences of polyene in the blend which are formed at lower temperatures than in PVC homopolymer. However, in the early stage of degradation, the polyene structures are developed in a more regular trans configuration, yielding significant amounts of poly(acetylene)-like structures before further degradation reactions occur. This seems to suggest that dehydrochlorination of PVC in blend systems might be controlled to give conjugated polyene structures with fewer defects.
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