科研之友
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摘要
The influence of chill roll temperature and thermal annealing on the morphology and dynamic mechanical behavior of poly(vinylidene fluoride) (PVDF)/poly(methyl methacrylate) (PMMA)/titanium dioxide blend films prepared by a melt casting process was studied. The beta phase of PVDF was formed at the chill roll temperature of 30 degrees C. Furthermore, with the increase in this chill roll temperature, its structural conversion to the alpha phase was observed. No change in the crystal structure of either the beta or alpha phase occurred on account of thermal annealing at 115 degrees C for 24 h. The decrement in the storage modulus above the glass transition temperature ascribed to the mixed amorphous phase became smaller, as the chill roll temperature increased. Based on morphological observations, we deduced that the reason for this decrement is not that the film cast at 115 degrees C was more crystalline than that cast at 30 degrees C but that the actual weight fraction of PMMA in the mixed amorphous phase of the film cast at 115 degrees C was lower than that of the one cast at 30 degrees C.
- 出版日期2013-10
