The Investigation of Conformational Change and Water Permeability of Poly(acrylic acid)-graftpolypropylene Membrane in Cross-flow Microfiltration

摘要：

A series of poly(acrylic acid)(PAA)-graftpolypropylene membranes was prepared by UVirradiation.The water flux of original PP membrane shows independence on pH and a linear increase with the rise of operating pressure. While the grafted membranes present great sensitivity to pH and a nonlinear relationship with operating pressure. As pH rises, grafted membranes are observed a rapid drop in flux since grafting PAA chains change from coiled to extended and then cause the decrease of pore size. It is evaluated by the change ratio of pore size that pH-sensitivity of grafted membranes increase with the rise of grafting degree till 17％. Furthermore, during Cross-flow microfiltration, the grafting chains on membrane surface tend to be bent at high operating pressure, so that membrane pores are partly blocked to cause a nonlinear rise of flux with operating pressure. In a conclusion, water permeability of grafted membranes greatly rely on the conformational change of grafting chains. These conformation alteration caused by pH or pressure may provide a new approach to control membrane filtration behaviors.

关键词： pH-sensitivity conformation microfiltration cross-flow

作者: Yanjun Liu Chunying Lv Jia Yang

作者单位: Tianjin Polytechnic University, No.63 Chenglin Road Hedong district Tianjin City, China

会议类型: 国际会议

会议名称: 2011 International Conference on Advanced Material Research(ICAMR 2011)(2011年先进材料研究国际会议)

会议地点: 重庆

会议语种:英文

页码: 397-401

在线出版日期: 2011-01-21（万方平台首次上网日期，不代表论文的发表时间）