利用傅立叶变换红外光谱(FTIR)跟踪不同温度下聚氨酯酰亚胺(Poly-urethane-imide.PUI)-聚酰亚胺(polyirnide,PI)共聚物(PUI-PI)的热解反应过程,扫描电镜(SEM)表征所制炭膜的结构形貌,N2吸附仪测定计算微孔炭膜的表面积和微孔体积,结合不同PI-PUI体系的炭化收缩率、微孔炭膜水通量的分析,研究了南PI-PUI制备微孔炭膜时不同嵌段的热稳定性及其梯度炭化成孔特性.结果显示:氨基甲酸酯基团在200℃～300℃温间分解,酰亚胺基团在500℃～700℃温间热解,分别为炭膜贡献了大孔和微孔;PUI前驱体的加入能有效降低炭膜的收缩率;外加炭黑对减少炭膜的收缩也有一定的作用,并能显著提高炭膜的微孔体积和总孔体积.
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