苯酰化聚苯醚/聚苯乙烯共混物相容性研究

MISCIBILITY OF BENZOYLATED POLY (2,6-DIMETHYL- 1,4-PHENYLENE OXIDE) WITH POLYSTYRENE

采用DSC方法研究了聚苯乙烯(PS)和苯甲酰化聚苯醚(APPO)共混体系的相容性.相容共混体系Gordon-Taylor方程K参数随苯甲酰化程度(取代度)增加而变小,其玻璃化转变区随取代度增加而变宽,取代度大于76mol％时,共混物呈现双玻璃化转变.APPO/PS共混体系热诱导相图同时存在LCST和UCST现象,且相行为是可逆的.

In the presence of a Friedal-Crafts catalyst, the benzoylated PPO (APPO) was prepared by the reaction of PPO with benzoyl chloride. By changing the ratio among PPO, catalyst and benzoylating agent, we obtained a series of samples (APPO) with different substitution levels. The misoibility of PS with various substituted PPO were studied by DSC. When the degree of benzoylation is more than 49 mol%, the blends of APPO/PS show two T, in DSC curves. The effect of temperatures on he phase behafior of A49 PPO/PS blends were studies by DSC. The blend system was found to exhibit both UCST and LCST behavior. It is also found that the thermally induced phase separation is reversible.