化学交联与热处理对聚乙烯醇膜性能的影响  

Effects of chemical cross-linking and heat treatment on polyvinyl alcohol membrane performance

作　　者：王艳丽[1] 杨虎[1] 许振良[1] 

机构地区：[1]华东理工大学化学工程研究所,上海200237

出　　处：《化学工程》2006年第8期36-39,共4页Chemical Engineering(China)

基　　金：国家"973"重点基础研究发展计划(2003CB615705)

摘　　要：采用相转化法制备聚乙烯醇膜,分别研究了化学交联以及热处理对膜结构和性能的影响,利用红外光谱获得膜的交联度和结晶度。结果表明随着处理时间的延长,膜的交联度或者结晶度增加;溶涨试验结果表明热处理后膜的孔隙率下降,而化学交联对膜的孔隙率影响不大;力学性能测定表明膜在干态与湿态下,力学性能差别巨大,化学交联的膜在干态下的性能要大大好于湿态下的力学性能,而热处理的膜正好相反,热处理后膜的机械性能湿态要好于干态。The effect of chemical cross-linking and heat-treatment on structure and performance of polyvinyl alcohol （PVA） membranes by the method of phase-inversion was studied. According to IR spectra of PVA membranes, their cross-linking density and crystallization were calculated. The result shows that with the increasing of time, the cross-linking density and crystallization improve, but the former is not distinct. Swelling experimental result shows that porosity of heat-treated membranes decrease but porosity of cross-linking has no changes. SEM photographs also verified it. Mechanical property testing indicates that the mechanical properties are very different from each other when membranes are at dry state and wet state. Cross-linked membranes have better mechanical property at dry state but it becomes fragile at wet state. The mechanical property of heat-treated membranes is very different from that of cross-linked membranes. The mechanical property of membranes at wet state is better than that at dry state. The reason may result from the rearrangement of polymer chains induced from heat-treatment and the rearrangement makes the structure and property of membrane changed. Although chemical cross-linking can＇t change the aggregation structure of PVA polymer, the inner stress induced from cross linking structure makes the property of membrane changed during the swelling process.

关 键 词：聚乙烯醇 孔结构 热处理 化学交联 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]