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san qian duan gong ju wu ps-b-peg-b-ps yu ju ben yi xi gong hun bao mo de biao mian xing mao yu xing neng yan jiu ?
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Year: Issue:  3
Journal: Journal of Chemical Engineering of Chinese Universities

Keyword:  苯乙烯与乙二醇三嵌段共聚物共混薄膜微相分离表面形貌;
Abstract: 使用原子转移自由基聚合(ATRP)制备三嵌段共聚物PS-b-PEG-b-PS.通过红外光谱、核磁共振氢谱(1H-NMR)和凝胶渗透色谱(GPC)对嵌段共聚物结构及分子量进行表征.将嵌段共聚物与聚苯乙烯溶液共混成膜,使用原子力显微镜(AFM)和接触角测试仪(CA)对不同含量嵌段共聚物共混膜的表面形貌和性能进行了分析表征.PEG链段与PS链段在共混膜中发生了微相分离,由于PEG链段对PS链段的热力学排斥作用以及PS的硬链段特性,PS不能在PEG微区上方形成覆盖,因而在薄膜表面形成大量孔洞,PEG微相区位于孔洞底部.随嵌段共聚物含量增加,孔洞(PEG微区)尺寸增大.当嵌段共聚物含量增加10%以后,孔洞内出现PS微相区,导致形成“胞状”结构.嵌段共聚物含量增加使得共混薄膜的亲水性和表面张力增大
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