Microstructure of N-isopropylacrylamide-acrylic acid copolymer gels having different spatial configurations of weakly charged groups
Microstructure of N-isopropylacrylamide-acrylic acid copolymer gels having different spatial configurations of weakly charged groups
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DOI：
10.1021/ma062216c
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发表时间：
2007-01
期刊：
影响因子：
5.5
通讯作者：
Fumiyoshi Ikkai;Takuya Suzuki;T. Karino;M. Shibayama
中科院分区：
文献类型：
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作者：
Fumiyoshi Ikkai;Takuya Suzuki;T. Karino;M. Shibayama
利用宏观溶胀测量和微观小角中子散射研究了凝胶网络中带电基团的空间构型对凝胶微结构形成的影响。制备了三种不同结构的疏水性N-异丙基丙烯酰胺（NIPAm）与弱电荷丙烯酸（AAc）共聚物的凝胶。第一种类型是NIPAm/AAc共聚物凝胶，其中NIPAm和AAc使用氧化还原方法在单体单元中无规共聚。第二种类型是紫外线交联的NIPAm/聚醋酸乙烯酯共聚物凝胶，其中NIPAm与醋酸乙烯酯聚合物单元共聚。第三种类型是使用氧化还原方法制备的NIPAm/聚-AAc聚合物凝胶，其中聚-AAc不交联，而是物理地包埋在NIPAm聚合物网络中。这三种类型的凝胶含有相同数量的带电基团，但具有不同的空间构型。在空间和拓扑分布的差异...
Gel microstructure formation according to spatial configuration of charged groups in gel network has been investigated using macroscopic swelling measurements and microscopic small-angle neutron scattering. Three types of gel consisting of hydrophobic N-isopropylacrylamide (NIPAm) and weakly charged acrylic acid (AAc) copolymers were prepared with different distributions of AAc monomer units in the network. The first type was a NIPAm/AAc copolymer gel in which NIPAm and AAc were randomly copolymerized in monomer units using the redox method. The second type was a UV-cross-linked NIPAm/poly-AAc copolymer gel in which NIPAm was copolymerized with polymer units of AAc. The third type was a NIPAm/poly-AAc polymer gel prepared using the redox method in which poly-AAc was not cross-linked but physically entrapped in the NIPAm polymer network. These three types of gel contained the same amount of charged groups but with different spatial configurations. The differences in spatial and topological distribution of ...