Control of thermoresponsive property of urea end‐functionalized poly(N‐isopropylacrylamide) based on the hydrogen bond‐assisted self‐assembly in water
Control of thermoresponsive property of urea end‐functionalized poly(N‐isopropylacrylamide) based on the hydrogen bond‐assisted self‐assembly in water
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DOI：
10.1007/978-4-431-55046-4_2
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发表时间：
2009-11
期刊：
影响因子：
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通讯作者：
Keita Fuchise;R. Kakuchi;Sung-Tso Lin;R. Sakai;Shin‐ichiro Sato;T. Satoh;Wen‐Chang Chen;T. Kakuchi
中科院分区：
文献类型：
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作者：
Keita Fuchise;R. Kakuchi;Sung-Tso Lin;R. Sakai;Shin‐ichiro Sato;T. Satoh;Wen‐Chang Chen;T. Kakuchi
本章介绍了脲端基官能化聚（N-异丙基丙烯酰胺）（PNIPAM）的原子转移聚合和铜催化叠氮-炔环加成反应以及通过改变末端脲基的氢键能力来控制PNIPAM的温敏性能，所得聚合物的相变温度随引入脲的氢键能力而变化1H NMR、动态光散射和透射电子显微镜测量证明，即使在低于浊点的温度下，由于末端脲基团的分子间氢键，脲末端官能化的PNIPAM已经在水中形成聚集体，这被认为是引起相变温度变化的原因。
This chapter describes the precise synthesis of urea end-functionalized poly(N-isopropylacrylamide)s (PNIPAM) by the atom transfer polymerization and the copper-catalyzed azide-alkyne cycloaddition as well as the control of the thermoresponsive properties of PNIPAM by changing the hydrogen bonding ability of the terminal urea groups. The phase transition temperature of the obtained polymers varied depending on the hydrogen bonding ability of the introduced urea group. The1H NMR, dynamic light scattering, and transmission electron microscopy measurements proved that the urea end-functionalized PNIPAM was already forming aggregates in water even at a temperature below the cloud point due to the intermolecular hydrogen bonding of the terminal urea group, which was considered to cause the variation in the phase transition temperature.