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Stretching-induced ion complexation in physical polyampholyte hydrogels

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Title: Stretching-induced ion complexation in physical polyampholyte hydrogels
Authors: Cui, Kunpeng Browse this author
Sun, Tao Lin Browse this author
Kurokawa, Takayuki Browse this author
Nakajima, Tasuku Browse this author
Nonoyama, Takayuki Browse this author
Chen, Liang Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Issue Date: 21-Nov-2016
Publisher: Royal Society of Chemistry
Journal Title: Soft matter
Volume: 12
Issue: 43
Start Page: 8833
End Page: 8840
Publisher DOI: 10.1039/c6sm01833e
PMID: 27722423
Abstract: Recently, we have developed a series of charge balanced polyampholyte (PA) physical hydrogels by random copolymerization in water, which show extraordinarily high toughness, self-healing ability and viscoelasticity. The excellent performance of PA hydrogels is ascribed to dynamic ionic bond formation through inter-and intra-chain interactions. The randomness results in ionic bonds of wide strength distribution, the strong bonds, which serve as permanent crosslinking, imparting the elasticity, while the weak bonds reversibly break and re-form, dissipating energy. In this work, we developed a simple physical method, called a pre-stretching method, to promote the performance of PA hydrogels. By imposing a pre-stretching on the sample in the as-prepared state, ion complexation during dialysis is prominently accelerated and the final performance is largely promoted. Further analysis suggests that the strong bond formation induced by pre-stretching is responsible for the change in final performance. Pre-stretching decreases the entropy of the system and increases the chain alignment, resulting in an increased possibility for strong bond formation.
Type: article (author version)
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 龔 剣萍 (Gong Jian Ping)

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