以邻苯二甲酸二甲酯(DMP)/邻笨二甲酸二辛酯(DOP)为混合稀释剂,采用热致相分离法(TIPS)制备聚偏氟乙烯(PVDF)微孔膜.研究了聚合物浓度、降温速率、混合稀释剂配比和凝固浴温度对聚偏氟乙烯微孔膜结构的影响.结果表明,随聚合物浓度的增加,膜断面由树枝状结构过渡为球粒状结构,最终转变为致密结构;随降温速率的增加,膜中的晶粒尺寸减小,数量增多;随混合稀释剂中DMP含量的增加,膜中的球晶结构更加完善;随凝固浴温度的增加,膜中的球粒状结构减少,花边状结构增加,微孔膜断面的平整度和孔径均匀性增强.
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