The pH-induced swelling and collapse atom transfer radical polymerization
The pH-induced swelling and collapse atom transfer radical polymerization
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DOI：
10.1039/b611847j
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发表时间：
2006-12-07
期刊：
影响因子：
3.4
通讯作者：
Menelle, Alain
中科院分区：
文献类型：
--
作者：
Geoghegan, Mark;Ruiz-Perez, Lorena;Menelle, Alain
我们使用中子反射计来表征聚[2-（二乙氨基）甲基丙烯酸乙酯]（一种聚碱）刷的膨胀行为与pH值的关系。通过原子转移自由基聚合的“接枝”方法合成的刷被观察到在低pH值溶液中其厚度大约增加了一倍，尽管pK（a）比稀释溶液中的pH值更低。从溶胀刷的反射实验中获得的组合物深度分布揭示了在基底和刷的延伸部分之间的聚合物耗尽的区域。
We have used neutron reflectometry to characterize the swelling behaviour of brushes of poly[2-(diethyl amino)ethyl metbacrylate], a polybase, as a function of pH. The brushes, synthesized by the "grafting from" method of atom transfer radical polymerization, were observed to approximately double their thickness in low pH solutions, although the pK(a) is shifted to a lower pH than in dilute solution. The composition-depth profile obtained from the reflectometry experiments for the swollen brushes reveals a region depleted in polymer between the substrate and the extended part of the brush.