Add time:08/18/2019         Source:sciencedirect.com

The phase behaviour of poly(2-chlorostyrene)/poly(vinyl methyl ether) blends (P2CSPVME) was investigated by means of light scattering and small-angle X-ray scattering (SAXS) using synchrotron radiation. It was found that P2CSPVME blends possess a lower critical solution temperature. Chemically labelling P2CS with photoreactive anthracene not only decreases the miscibility of the blends but also shifts the critical point of the phase diagram towards a composition higher in P2CS — a typical effect of such systems with polydispersity induced by the labelling reaction. Within the temperature range of the experiments, the critical behaviour of both unlabelled and labelled blends can be accurately expressed by the mean-field theory with the critical exponents v = 12 and y = 1. These experimental results suggest that the effects of chemical labelling of polymer chains via polymer reactions may play an important role in the phase decomposition kinetics and morphological studies of polymer blends.

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