主链含硅的芳族聚酰胺的合成及其气体选择透过性能

采用界面缩合聚合方法，合成了一系列主链含硅的芳族聚酰胺，从化学结构与气体透过性能关系的角度研究了此类聚合物均质膜的气体透过性能，结果表明，此类聚合物膜对Ｈ２、Ｏ２、Ｎ２、ＣＯ２、ＣＨ４的气体透过系数大小顺序符合一般玻璃态聚合物规律；在刚性强的高分子链段中引进柔性基因，可提高聚合物的气体透过系数；高分子主链有较强内旋转能力的聚合物，气体透过系数大；高分子主链的化学结构相同，苯环上带有侧甲基的聚合物有高的气体透过系数；硅原子上带有侧苯基的聚合物，其气体扩散系数大于而溶解系数小于硅原子上携有侧甲基的聚合物．结论为，在刚性高分子主链中引入柔性基团和提高刚性链间隙是增大气体透过含硅聚酰胺膜速率的有利因素．

SYNTHESIS OF SILICON-CONTAINING POLYARAMIDES AND THEIR GAS PFRMSELECTIVITY

series of silicon-containing polyaramide were synthesized by methodof interfacial polycondensation, and the relationship between their chemical structure and gas transport property was discussed. It is found that the permeability forgases used in this experiment, which is hydrogen; oxygen; nitrogen; carbon dioxide; and methane, is fit for ordinary glassy polymer. Gas permeability increases byintroducing flexible segment into rigid polymer chain. Polyaramide with easily rotational backbone has higher gas permeability, For two polymers with the samebackbone, gas permeability is higher for one with methyl side group on its aromatic ring. The polyaramide with phenyl side group on silicon atom has higher diffusivity, but lower solubility than that with methyl side group on silicon atom.These results indicate that in addition to intrachain motion, interchain spacingdifference is a contributing factor in understanding various transport behavior ofgas through these silicon-containing polyaramide.