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Multivalent Cations-Triggered Rapid Shape Memory Sodium carboxymethyl cellulose/Polyacrylamide Hydrogels with Tunable Mechanical Strength
Carbohydrate Polymers ( IF 11.2 ) Pub Date : 2017-09-11 , DOI: 10.1016/j.carbpol.2017.09.030
Nan Li , Guangxue Chen , Wei Chen , Jiahe Huang , Junfei Tian , Xiaofang Wan , Minghui He , Hongfang Zhang

A novel multivalent cations-triggered shape memory hydrogels were synthesized in a one-pot method, and interpenetrating double network was formed by chemically cross-linked polyacrylamide (PAM) network and physically cross-linked sodium carboxymethyl cellulose network. The temporary shape was fixed by complexation between a native biopolymer, sodium carboxymethyl cellulose (CMC), and transition metal ions, specifically Fe3+, Ag+, Al3+, Cu2+, Ni2+, and Mg2+. In particular, CMC-Fe3+ hydrogel exhibits excellent shape fixity ratio (95%). Therefore, we chose PAM/CMC1.0-Fe3+ hydrogel as the model material and further investigated its shape recovery process. It was found that a wide range of molecules and anions could be applied to break off the temporary cross-links between CMC and Fe3+. The PAM/CMC composite hydrogels also exhibited excellent tunable mechanical properties. The mechanical properties of the composite hydrogel can be adjusted by changing the cross-linking densities. The presented strategy could enrich the construction as well as application of biopolymers based shape memory hydrogels.

中文翻译:

具有可调节机械强度的多价阳离子触发的快速形状记忆钠羧甲基纤维素/聚丙烯酰胺水凝胶

一锅法合成了新型的多价阳离子触发形状记忆水凝胶,通过化学交联的聚丙烯酰胺(PAM)网络和物理交联的羧甲基纤维素钠网络形成互穿双网络。临时形状通过天然生物聚合物,羧甲基纤维素钠(CMC)和过渡金属离子(特别是Fe 3+,Ag +,Al 3+,Cu 2 +,Ni 2+和Mg 2+)之间的络合而固定。特别地,CMC-Fe 3+水凝胶表现出优异的形状固定率(95%)。因此,我们选择了PAM / CMC 1.0 -Fe 3+以水凝胶为模型材料,并进一步研究了其形状恢复过程。已经发现,可以应用各种各样的分子和阴离子来破坏CMC和Fe 3+之间的临时交联。PAM / CMC复合水凝胶还表现出出色的可调机械性能。可以通过改变交联密度来调节复合水凝胶的机械性能。提出的策略可以丰富基于形状记忆水凝胶的生物聚合物的构建及应用。
更新日期:2017-09-13
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