中华医学超声杂志

应用化学 ›› 1993, Vol. 0 ›› Issue (1): 77-79.

• 研究简报 • 上一篇    下一篇

聚乙烯醇缩醛膜的加湿透气性

弋瑛, 俞贤达, 武和平, 王安来, 曹淑琴, 刘焕燧, 李彩云   

  1. 中国科学院兰州化学物理研究所 730000 兰州
  • 收稿日期:1991-10-10 修回日期:1992-07-22 出版日期:1993-02-10 发布日期:1993-02-10

GAS PERMEATION OF MOISTENED POLYVINYLACETAL MEMBRANES

Yi Ying, Yu Xianda, Wu Heping, Wang Anlai, Cao Suqin, Liu Huansui, Li Caiyun   

  1. Lanzhou Institute of Chemical Physics, Academia Sinica, 730000 Lanzhou
  • Received:1991-10-10 Revised:1992-07-22 Published:1993-02-10 Online:1993-02-10

PDF

436

被引次数

1

摘要： 前曾报道聚乙烯醇(PVA)与脂肪醛缩合后亲水性的羟基减少,影响到其薄膜的透湿性和透气性,本文考察PVA及其三种脂肪族缩醛物膜在加湿条件下的透气性。

关键词: 聚乙烯醇, 聚乙烯醇缩醛, 增湿膜, 透气性

Abstract: The permeabilities of O2,N2 and CO2 were measured at 293K and 303K for the moistened membranes made of polyvinyl alcohol(PVA),polyvinyl aoetal (PVAL),polyvinyl butylral(PVB) and polyvinyl octylral (PVO). The apparatus for measuring the gas permeability of water-moistened membrane is described. It was observed that the permeability coefficients of O2 and N2 for the moistened PVA membrane are several hundred times as much as that for anhydrous PVA membrane, with slight increase in the permselectivity of O2 to N2. The permeabilities,diffusion and solubility coefficients of O2, N2 and CO2 and permselectivities of O2 to N2 and of CO2 to O2 in the moistened polyvinyl acetals membranes increase with the increase of the alkyl chain.

Key words: polyvinyl alcohol, polyvinylacetals, moistened membrane, gas permeability

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