三甲基硅烷基丙炔与五甲基二硅烷基丙炔共聚物膜及其气体透过性

MEMBRANE OF COPOLYMER OF TRIMETHYLSILYL PROPYNE WITH PENTAMETHYLDISILYL PROPYNE AND ITS GAS PERMEATION

研究了三甲基硅烷基丙块与五甲基二硅烷基丙块共聚物〔poly(TMSP-co-PMDSP)〕的成膜特点。poly(TMSP-co-PMDSP)膜的气体透过系数分别为:P_(O2):4×10~3～12×10~3,P_(N2):3×10~3～8×10~3和P_(CO2):2×10~4～4×10~4barrer,气体透过稳定性低,透过行为偏离第二Fick定律,过系数下降,其中溶解系数降低的比例远大于扩散系数的增加比例,在含有凝聚性气体的环境里,膜的气体透过出现表面吸附控制的特征。

The formation of membranes from copolymer of trimethylsilyl propyne with pentamethy-ldisilyl propyne poly(TMSP-co-PMDSP) has been investigated. The copolymer exhibited asimilar performance in membrane formation and gas permeability as the homopolymer PTMSP.Its permeability coefficients and separation factors were P_(O2) = 4×10~3～12×10~3, P_(N2) = 3×10~3～8×10~3, P_(CO2) = 2×10~4～4×10~4 Barrer and α_(O2/N2) = 1. 3～1. 9, respectively. The gas permeationbehaviour was dependent on the thickness of the membrane and deviated from the SecondFick law. In the presence of organic condensed gas, the gas permeability appeared to becontrolled by surface adsorption of gas. The gas permeability coefficient decreases withthe increase of the storage time and temperature because the solubility coefficient reductionΔS of the membrane was greater than its diffusibility coefficient increase ΔD. The gas per-meability was deeply influenced by the thermal history of the membrane.