顺丁橡胶／酯－醚液晶复合膜的富氧性能研究

Studies on Oxygen Enrichment Properties of Poly(cis-butadiene)Ester-Ether Liquid Crystal Composite Membranes

首次制成顺丁橡胶（ＰＢ）与具有二重液晶相转变（近晶相，向列相）的液晶化合物双４－（４’－乙氧基苯甲酰氧基）苯甲酸一缩乙二醇酯（ＤＥＢＥＢ）的复合膜并研究了其富氧性能。ＰＢ／ＤＥＢＥＢ复合膜在液晶含量１０％时，室温下具有比基质聚合物ＰＢ膜大几倍的氧透过系数（ｐｏ２）。透过系数与温度的关系曲线呈现“Ｎ”型特征。这些现象与液晶的二重相变行为和膜的形态结构有关。

Polymer/liquid crystal composite membranes containing poly(cis-butadiene)(PB)and diethylene glycol bis-4-(4'-ethoxybenzoyloxy) benzoate(DEBEB)with two transitionmesophases were prepared for the first time and their oxygen enrichment properties were investigated.The oxygen permeability of the composite membrane with 10%weight content ofDEBEB liquid crystal exhibited several times greater than that of the PB membrane at roomtemperature.Relationship between permeability coefficients and temperatures was characterized by N-shape curves,that is,the permeability coefficients first increased,followed by decreasing,and then increased again with increasing temperature continuously.We interpretthis result as effect of phase behavior of the liquid crystal and morphology of the compositemembranes on the permeabilities.