CONTROL OF WATER PERMEATION BY PH AND IONIC-STRENGTH THROUGH A POROUS MEMBRANE HAVING POLY(CARBOXYLIC ACID) SURFACE-GRAFTED
CONTROL OF WATER PERMEATION BY PH AND IONIC-STRENGTH THROUGH A POROUS MEMBRANE HAVING POLY(CARBOXYLIC ACID) SURFACE-GRAFTED
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DOI：
10.1021/ma00052a037
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发表时间：
1992-12-21
期刊：
影响因子：
5.5
通讯作者：
IMANISHI, Y
中科院分区：
文献类型：
--
作者：
ITO, Y;INABA, M;IMANISHI, Y
通过表面接枝聚合带有羧酸取代基的乙烯基单体，合成了一种可根据pH值和离子强度控制水渗透速率的直孔膜。水渗透通过所制备的膜的速率响应于水溶液的pH变化而可逆地变化。水渗透的pH响应通过改变接枝链的密度和长度来控制。最敏感的pH响应是用具有以低密度接枝的高聚合度的聚（羧酸）的膜获得的。表面接枝聚丙烯酸、聚甲基丙烯酸和聚乙基丙烯酸的膜分别在pH 3.0、4.0和6.8下发生水渗透速率的急剧变化。水渗透的pH响应受水溶液的离子强度的影响。
A straight-pored membrane, which controls the rate of water permeation according to pH and ionic strength, was synthesized by surface-graft polymerization of vinyl monomers carrying a carboxylic acid substituent. The rate of water permeation through the prepared membrane changed reversibly in response to pH variation of the aqueous solution. The pH response of water permeation was controlled by changing the density and length of graft chains. The most sensitive pH response was attained with a membrane having poly(carboxylic acid) of a high degree of polymerization grafted in low densities. The drastic change of the water-permeation rate occurred at pH 3.0, 4.0, and 6.8 with membranes having poly(acrylic acid), poly(methacrylic acid), and poly(ethacrylic acid) surface-grafted, respectively. The pH response of water permeation was affected by the ionic strength of the aqueous solution.