COPOLYIMIDE;
MOLECULAR WEIGHT;
GAS DIFFUSION;
PERMEABILITY;
SELECTIVITY;
D O I:
10.1016/0032-3861(93)90571-Q
中图分类号:
O63 [高分子化学(高聚物)];
学科分类号:
070305 ;
080501 ;
081704 ;
摘要:
The gas permeation behaviour of a number of polyimide copolymers. including a series of copolyimides of identical structure with different molecular weights, have been investigated. Permeabilities and selectivities were found to vary over a broad molecular weight range at high molecular weights. Differences in permeability with molecular weight can be comparable to differences due to marked changes in chemical structure.