含聚二甲基硅氧烷短支链的聚酰亚胺的合成及其透氧性的研究

Preparation and Permeability of Silo-cane-Grafted Polyimides

摘要: 介绍了在甲撑二苯胺的亚甲基上接上聚二甲基硅氧烷短链，并用含二甲基硅氧烷短链的二苯胺单体和均苯四甲酸二酐反应制取聚酰亚胺的方法。实验结果表明，在含三硅量相同的情况下，支链型的改性聚酰亚胺的机械强度高。氧的透过系数随支链长度的增加而增加，当二甲基硅氧烷短链的硅原子由１增加到４时，透氧系数由３．６５Ｂａｒｒｅ增加到１２．０Ｂａｒｒｅ，而Ｏ２／Ｎ２分离系数则由６．４降到３．５。

Abstract: This paper presents a method to prepare silo-cane-grafted polyimides with well defined Structure via the synthesis of methylene dianiline with dimethylsiloxane branch of different length linked on its methylene group and the polycondensation with PMDA. Th