依据相平衡理论,有机溶剂在聚合物膜中达到溶解平衡时,组分i在液相中化学势应等于其在聚合物膜相中的化学势.文中用UNIQUAC活度系数模型计算组分在液相中的活度,UNIFAC+FV基团贡献法关联有机溶剂在聚合物膜中的活度,理论预测了聚丙烯(PP)膜在正戊烷和正己烷中的溶胀行为.与文献实测值进行比较,一定程度上二者能够吻合.若考虑聚合物膜粘弹性的影响,计算结果有所改进.鉴于UNIFAC+FV法无需组分间交互作用参数,值得推荐.
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