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A Double Network Hydrogel with High Mechanical Strength and Shape Memory Properties
Lei Zhu,Chun-ming Xiong,Xiao-fen Tang,Li-jun Wang,Kang Peng,Hai-yang Yang*
Author NameAffiliationE-mail
Lei Zhu CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China  
Chun-ming Xiong Research Institute of Science and Technology, China National Petroleum Corporation, Beijing 100083, China  
Xiao-fen Tang Research Institute of Science and Technology, China National Petroleum Corporation, Beijing 100083, China  
Li-jun Wang CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China  
Kang Peng CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China  
Hai-yang Yang* CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China yhy@ustc.edu.cn 
Abstract:
Double network (DN) hydrogels as one kind of tough gels have attracted extensive attention for their potential applications in biomedical and load-bearing fields. Herein, we import more functions like shape memory into the conventional tough DN hydrogel system. We synthesize the PEG-PDAC/P(AAm-co-AAc) DN hydrogels, of which the first network is a well-defined PEG (polyethylene glycol) network loaded with PDAC (poly(acryloyloxyethyltrimethyl ammonium chloride)) strands, while the second network is formed by copolymerizing AAm (acrylamide) with AAc (acrylic acid) and cross-linker MBAA (N,N'-methylenebisacrylamide). The PEG-PDAC/P(AAm-co-AAc) DN gels exhibits high mechanical strength. The fracture stress and toughness of the DN gels reach up to 0.9 MPa and 3.8 MJ/m3, respectively. Compared with the conventional double network hydrogels with neutral polymers as the soft and ductile second network, the PEG-PDAC/P(AAm-coAAc) DN hydrogels use P(AAm-co-AAc), a weak polyelectrolyte, as the second network. The AAc units serve as the coordination points with Fe3+ ions and physically crosslink the second network, which realizes the shape memory property activated by the reducing ability of ascorbic acid. Our results indicate that the high mechanical strength and shape memory properties, probably the two most important characters related to the potential application of the hydrogels, can be introduced simultaneously into the DN hydrogels if the functional monomer has been integrated into the network of DN hydrogels smartly.
Key words:  Double network hydrogel  Weak polyelectrolyte  High mechanical strength  Shape memory properties
FundProject:This work was supported by the National Natural Science Foundation of China (No.51273189), the National Science and Technology Major Project of the Ministry of Science and Technology of China (No.2016ZX05016), and the National Science and Technology Major Project of the Ministry of Science and Technology of China (No.2016ZX05046).
具有双网络结构高强度和形状记忆水凝胶
朱雷,熊春鸣,唐孝芬,王利军,彭康,杨海洋*
摘要:
本文将形状记忆功能引入到双网络水凝胶设计之中.首先合成了聚乙二醇-聚丙烯酰氧乙基三甲基氯化铵/聚(丙烯酰胺-co-丙烯酸)(PEG-PDAC/P(AAm-co-AAc))双网络水凝胶,其中第一套网络由交联的聚乙二醇(PEG)链组成,包埋着聚电解质聚丙烯酰氧乙基三甲基氯化铵(PDAC);第二套网络由丙烯酰胺(AAm)和丙烯酸(AAc)的共聚物交联组成,交联剂为N,N'-亚甲基双丙烯酰胺(MBAA).结果表明,双网络水凝胶显示出高强度的特点,其断裂应力和韧性分别达到了0.9 MPa和3.8 MJ/m3.和传统地利用中性高分子作为柔软和韧性的第二套网络相比较,本文选择将具有弱电解质特性的丙烯酸单体引入到第二套网络中,利用丙烯酸与三价铁离子的络合作用,成功地赋予水凝胶在氧化环氧反应条件下的形状记忆功能.结果表明,只要巧妙地引入响应性单体,高强度和形状记忆这两种最重要的特性可以同时被引入到双网络水凝胶的设计之中.
关键词:  双网络水凝胶  弱聚电解质  高强度  形状记忆特性
DOI:10.1063/1674-0068/31/cjcp1710188
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