4，4′－联苯二甲酸－酚酞／四溴酚酞共聚酯的气体透过性能

合成了一系列单体比例不同的４，４′－联苯二甲酸－酚酞／四溴酚酞共聚酯，并制成柔软透明的均质薄膜。测定了膜对氢气、氧气、氮气、二氧化碳、甲烷的气体透过性能，重点研究单体比例不同的共聚物中分子主链溴含量对气体透过性能的影响，发现随着四溴酚酞单体含量的增加，气体在聚合物中的溶解系数增大；扩散系数下降；气体透过系数在一定范围内存在较大值；分离系数的变化则不明显。结果表明在聚芳酯的芳环上引入适当含量的溴，可以提高聚合物的气体透过系数，而对分离系数的值影响不大。

The Gas Transport Properties in Copolyarylates of 4,4'-Biphenyl Dicarboxylic Acid with Phenolphthalein and Tetrabrome Phenolphthalein

In this papers,a series of copolymers from 4,4'-bipllenyl dicarboxylic acid with phenolphthalein and tetrabromo phenolphthalein were synthesized, and transparent flexible films were cast. The gas transport property of polyarylate was measured,and relationship between the gas transport property and molar content of bromine on main chain was studied.It is found that the solubility in membrane rises with increasing content of bromine,but diffusivity decreases. The gas permeation coefficient has a peak value when molar content of tetrabromo phenolphthalein is 40-60 percent, selectivity does not change too much.It indicates that a moderate amount of aryl bromine on backbone of polyarylate is a contributing factor for increase of gas permeability,which not decrease of selectivity much.