聚丙烯酰胺
自愈水凝胶
明胶
材料科学
韧性
复合材料
共价键
脆性
聚合物
断裂韧性
聚电解质
高分子化学
化学
生物化学
有机化学
作者
Xingyue Sun,Lina Ye,Haiyi Liang
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2021-01-01
卷期号:17 (42): 9708-9715
被引量:11
摘要
Nowadays, several approaches are being suggested to endow hydrogels with improved mechanical properties for practical applications as cartilage and skin replacements, soft electronics, and actuators. However, it remains a challenge to develop DN gels with both high fracture toughness and fracture stretch. Here, we introduce (bio)polyelectrolyte complexes (PECs) consisting of gelatin and κ-carrageenan as the first brittle network and covalently crosslinked polyacrylamide (PAAm) as the second stretchable network to fabricate a highly stretchable and notch-insensitive gelatin/κ-carrageenan/PAAm hydrogel. The unprecedented high stretchability (∼51.7) is ascribed to the reduction of stress concentration and defects in the network structure through the fracture of the PEC gel. In addition, a high fracture toughness (∼16053.34 J m-2) is achieved by effective energy transfer between the PECs and PAAm gel due to their covalent crosslinking, and efficient energy dissipation through destroying inter- and intramolecular interactions in the PEC gel.
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