Tough hydrogels with rapid self-reinforcement

doi:10.1126/science.aaz6694

GSTDTAP > 气候变化

DOI	10.1126/science.aaz6694
	Tough hydrogels with rapid self-reinforcement
	Chang Liu; Naoya Morimoto; Lan Jiang; Sohei Kawahara; Takako Noritomi; Hideaki Yokoyama; Koichi Mayumi; Kohzo Ito
	2021-06-04
发表期刊	Science
出版年	2021
英文摘要	Hydrogels are typically weak materials because they contain only a small fraction of polymeric material highly swollen with water. Strength can be increased by adding extra cross-linking or interpenetrating networks with some sacrificial bonds to enhance toughness; however, these properties deteriorate upon stretching and may be slow to recover after relaxation. Liu et al. developed polyethylene glycol hydrogels cross-linked with moderate fractions of polymers that form sliding rings. These allow the chain to orient in parallel when stretched, leading to rapid and reversible strain-induced crystallization and thus much tougher hydrogels. Science , aaz6694, this issue p. [1078][1] Most tough hydrogels are reinforced by introducing sacrificial structures that can dissipate input energy. However, because the sacrificial damage cannot rapidly recover, the toughness of these gels drops substantially during consecutive cyclic loadings. We propose a damageless reinforcement strategy for hydrogels using strain-induced crystallization. For slide-ring gels in which polyethylene glycol chains are highly oriented and mutually exposed under large deformation, crystallinity forms and melts with elongation and retraction, resulting both in almost 100% rapid recovery of extension energy and excellent toughness of 6.6 to 22 megajoules per square meter, which is one order of magnitude larger than the toughness of covalently cross-linked homogeneous gels of polyethylene glycol. [1]: /lookup/doi/10.1126/science.aaz6694
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/329873
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Chang Liu,Naoya Morimoto,Lan Jiang,et al. Tough hydrogels with rapid self-reinforcement[J]. Science,2021.
APA	Chang Liu.,Naoya Morimoto.,Lan Jiang.,Sohei Kawahara.,Takako Noritomi.,...&Kohzo Ito.(2021).Tough hydrogels with rapid self-reinforcement.Science.
MLA	Chang Liu,et al."Tough hydrogels with rapid self-reinforcement".Science (2021).