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A double network hydrogel with high mechanical strength and shape memory properties
杨海洋
Author NameAffiliationE-mail
杨海洋 中国科学技术大学高分子科学与工程系 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 network loaded with PDAC strands, while the second network is formed by copolymerizing acrylamide with acrylic acid and cross‐linker MBAA. 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 PEGPDAC/ P(AAm‐co‐AAc) 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 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:
A double network hydrogel with high mechanical strength and shape memory properties
杨海洋
摘要:
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 network loaded with PDAC strands, while the second network is formed by copolymerizing acrylamide with acrylic acid and cross‐linker MBAA. 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 PEGPDAC/ P(AAm‐co‐AAc) 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 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.
关键词:  Double network hydrogel, Weak polyelectrolyte, High mechanical strength, Shape memory properties
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