【摘要】 对低真空压力法表征高分子膜的气体透过性能的可靠性进行了探讨。利用低真空法对厚度分别为17、18、45、60、84μm的聚-4-甲基戊烯-1（PMP）均质致密平膜,在不同温度下进行了氧、氮气体透过性能的评价。发现在同一温度下,厚度小于20μm时,PMP膜对氧气、氮气的透过系数Po₂,PN2值较厚度在40μm以上的PMP膜的Po₂、PN₂值高,而Po₂/PN₂值偏小,大于45μm厚的PMP膜的Po₂、PN₂、Po₂/PN₂值则比较接近。而在同一膜厚的情况下,随着温度升高,膜的Po₂、PN₂增大（其Arrhenius图呈直线）,Po₂/PN₂值则有所下降,膜厚超过45μm时,Po₂/PN₂值下降更快。鉴于以上结果,提出了对厚度较薄的高分子膜,其实测气体透过系数P应进行修正的看法。更多还原

【Abstract】 It is discussed that the truth of gas permeabilities of membranes characterized by means of low vacuum pressure method which is applied to evaluate homogeneous packed planar membranes of poly-4-methylpentene-1 （PMP） with thickness in 17, 18, 45, 60, 84μm, to evaluate the oxygennitrogen permeable properties under different temperatures. It is found that under same temperatures of membranes with thickness lower than 20μm, the Po₂ and PN₂ values were larger than those above 45μm, but the αo₂/N₂ values were low, and above 45 μm, the Po₂, PN₂ and αo₂/N₂ values tend to be. of same, values.更多还原