论文部分内容阅读
讨论了聚２，６－二甲基－１，４－苯撑氧（ＰＰＯ）与三甲基氯硅烷和三苯基氯硅烷的反应，合成了一系列取代含量不同的三甲基硅取代ＰＰＯ（ＴＭＳ－ＰＰＯ）和三苯基硅取代ＰＰＯ（ＴＰＳ－ＰＰＯ）．研究了取代基团不同和取代含量变化对聚合物的气体选择透过性能的影响，发现ＴＭＳ－ＰＰＯ的气体透过系数随三甲基硅取代量加大而增高，分离系数下降；ＴＰＳ－ＰＰＯ的气体透过系数和分离系数都随三苯基硅取代量的增加而下降，ＴＰＳ－ＰＰＯ与ＴＭＳ－ＰＰＯ的气体溶解系数相近，扩散系数差别较大．故二者气体透过系数的不同主要是由于扩散系数的差异．从化学结构与气体透过性能关系的角度来看，若在聚合物分子中引入有较小转动自由能的大基团，则有利于气体分子的扩散透过．
The reaction of poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) with trimethylchlorosilane and triphenylchlorosilane was discussed. A series of trimethylsilyl substituted PPO (TMS-PPO) and triphenylsilane-substituted PPO (TPS-PPO). The effects of different substitution groups and the content of substitution on the gas-selective permeability of the polymer were investigated. It was found that the gas permeability coefficient of TMS-PPO increased with the increase of trimethylsilyl substitution and the separation coefficient decreased. TPS-PPO Gas permeation coefficient and separation coefficient all decreased with the increase of triphenylsilane substitution. The gas solubility coefficients of TPS-PPO and TMS-PPO were similar, but the diffusion coefficients differed greatly. Therefore, the difference between the two gas permeability coefficients is mainly due to the difference of diffusion coefficient. From the perspective of the relationship between chemical structure and gas permeation performance, if a large group with small rotational free energy is introduced into a polymer molecule, diffusion of gas molecules is facilitated.