利用倒相法在纯水和φ(ethanol)=20%、φ(ethanol)=40%的乙醇/水凝胶浴中分别制备了聚偏氟乙烯(PVDF)多孔膜,通过SEM,DSC对这些薄膜进行了分析表征. 结果表明纯水凝胶浴中所成膜为指状多孔膜,随着凝胶浴乙醇体积分数的增加,膜指状大孔逐渐消失,在φ(ethanol)=40%的乙醇/水凝胶浴中转变为海绵状多孔膜;指状多孔膜和海绵状多孔膜熔点相对于原料分别提高了3.9 ℃和3.5 ℃,而结晶度相对于原料分别提高了16.1%和13.5%.对成膜机理和结晶度变化的原因进行了分析.
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