True Chemical Structure of Double Network Hydrogels
True Chemical Structure of Double Network Hydrogels
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DOI：
10.1021/ma802148p
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发表时间：
2009-03-24
期刊：
影响因子：
5.5
通讯作者：
Gong, Jian Ping
中科院分区：
文献类型：
--
作者：
Nakajima, Tasuku;Furukawa, Hidemitsu;Gong, Jian Ping
我们解释了为什么当第二网络在没有任何交联剂的情况下聚合时，双网络凝胶获得反常的高强度。我们已经合成了真正独立的-dN凝胶(命名为“t-dN”凝胶)，它在第一和第二网络之间没有任何共价键，并且表明t-dN凝胶不能被未交联的第二网络增韧。这意味着没有第二网络交联剂的普通DIN凝胶的高强度实际上是通过两个网络之间的共价键相互连接而实现的(所以通常的DN凝胶被称为c-dN凝胶)。此外，我们还发现，当第二网络松散地交联时，t-dN凝胶变得比c-dN凝胶更强。由于t-dN凝胶比c-dN凝胶具有更简单的结构，我们期待通过对t-dN凝胶的研究来阐明dN凝胶的增韧机理。
We elucidate why the anomalous high strength of double network gels is obtained when the second network is polymerized without any cross-linkers. We have synthesized truly independent-DN gels (named "t-DN" gels), which do not have any covalent bonds between the first and the second networks, and showed that the t-DN gels cannot be toughened by the un-cross-linked second network. It means that the high strength of Usual DIN gels without the cross-linker of the second network is actually achieved by the interconnection between the two networks through covalent bonds (so usual DN gels were named "c-DN" gels). Further, we found that the t-DN gels become stronger than the c-DN gels when the second network is loosely cross-linked. As the t-DN gels have a more simple structure than the c-DN gels, we expect that the toughening mechanism of DN gels will be clarified by studying the t-DN gels in the future.