Graphene/cyclodextrin-based nanocomposite hydrogel with enhanced strength and thermo-responsive ability.
Graphene/cyclodextrin-based nanocomposite hydrogel with enhanced strength and thermo-responsive ability.
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DOI：
10.1016/j.carbpol.2017.06.081
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发表时间：
2017-10
影响因子：
11.2
通讯作者：
Pang Zhu;Yonghong Deng;Chaoyang Wang
中科院分区：
文献类型：
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作者：
Pang Zhu;Yonghong Deng;Chaoyang Wang
双交联体系是制备坚韧高强度水凝胶的有效方法。本文以α-环糊精/氧化石墨烯（GO）为水溶液，通过丙烯酰胺（AM）和聚乙二醇甲基醚（PEGMA）的共聚反应，制备了一种新型氧化石墨烯/p（丙烯酰胺-co-聚乙二醇甲基醚甲基丙烯酸酯）/α-环糊精（GO/P（AM-co-PEGMA）/CD）物理双交联水凝胶。聚合物主链吸附到GO表面上，产生第一交联系统，并且在PEGMA侧链上穿线的α-CD之间的多个氢键建立第二交联系统。GO/P（AM-co-PEGMA）/CD水凝胶具有良好的拉伸性能，断裂应变为1800%，断裂应力为660 kPa;此外，该水凝胶可以在85%的应变下承受较大的压缩应力（2.7 MPa）而不破裂。物理双重交联体系赋予GO/P（AM-co-PEGMA）/CD水凝胶热塑性和热响应性形状记忆性能。该方法将有助于高性能水凝胶的设计和应用。
Dual crosslinked system has been proved to be an efficient method to obtain tough and high strength hydrogels. Herein, we synthesized a novel graphene oxide/p(acrylamide-co-poly(ethylene glycol) methyl ether methacrylate)/α-cyclodextrin (GO/P(AM-co-PEGMA)/CD) physical dual crosslinked hydrogel via copolymerization of AM and PEGMA in the α-CD/GO solution. The polymer main chains adsorb onto the GO surface resulting in the first crosslinked system and multiple hydrogen bonds between α-CDs that thread on the PEGMA side chains establish the second crosslinked system. The GO/P(AM-co-PEGMA)/CD hydrogel exhibits favorable tensile properties with fracture strain of 1800% and high fracture stress of 660 kPa; in addition, the hydrogel can bear large compressive stress (2.7 MPa) at strain of 85% without rupture. Furthermore, physical dual crosslinked system endows the GO/P(AM-co-PEGMA)/CD hydrogel with thermoplastic ability and thermo-responsive shape memory behavior. This facial one-pot method will contribute to design and application of high performance hydrogel.