Swelling of poly(methacrylic acid) brushes:: Influence of monovalent salts in the environment
Swelling of poly(methacrylic acid) brushes:: Influence of monovalent salts in the environment
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DOI：
10.1021/ma047501f
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发表时间：
2005-05-31
期刊：
影响因子：
5.5
通讯作者：
Rühe, J
中科院分区：
文献类型：
--
作者：
Zhang, HN;Rühe, J
采用多角度零椭圆偏振法研究了聚甲基丙烯酸（PMAA）刷在不同一价盐水溶液中共价附着于固体平面表面的膨胀行为。采用表面附着引发剂（“接枝法”），通过表面引发聚合从表面原位生长聚合物链。测定了PMAA刷的溶胀率与pH值、低分子量盐的加入浓度和表面附着聚合物刷接枝密度的关系。pH = 4 ~ 10时，随着盐添加浓度的增加，刷体厚度先增大后减小；也就是说，在中等盐浓度时，刷体厚度出现最大值。研究了不同单价共价和反价离子的化学性质对电刷膨胀行为的影响。
The swelling behavior of poly(methacrylic acid) (PMAA) brushes covalently attached to solid planar surfaces in aqueous solutions containing different monovalent salts was investigated with multiangle null ellipsometry. The polymer chains were grown in situ from the surface by surface-initiated polymerization using a surface-attached initiator ("grafting from" method). The swelling of the PMAA brushes was measured as a function of pH value, concentration of added low molecular weight salt, and the grafting density of the surface-attached polymer brushes. At pH values between 4 and 10, the brush thickness initially increases and then decreases with increasing concentration of added salt; i.e., a maximum of brush thickness appears at a medium salt concentration. The influence of the chemical nature of different monovalent co- and counterions on the swelling behavior of the brushes is studied.