自愈水凝胶
乙烯醇
生物相容性
材料科学
极限抗拉强度
复合材料
机械强度
线程(计算)
聚合物
纳米技术
化学工程
高分子化学
计算机科学
操作系统
冶金
工程类
作者
Wei Chen,Nan Li,Yi Ma,Marilyn Minus,Kenneth Allen Benson,Xiuling Lü,Xingzhi Wang,Xi Ling,Hongli Zhu
出处
期刊:Biomacromolecules
[American Chemical Society]
日期:2019-10-23
卷期号:20 (12): 4476-4484
被引量:84
标识
DOI:10.1021/acs.biomac.9b01223
摘要
Hydrogels are attracting increasing attention due to their potential use in various fields. However, most of the existing hydrogels have limitations in either dissipating mechanical energy or maintaining high stretchability under deformation, thus do not possess high mechanical properties. Herein, poly(vinyl alcohol) (PVA)–tannic acid (TA) hydrogels with both high mechanical strength and stretchability were obtained via a step-by-step physical cross-linking and molecular alignment method. Saline-triggered physical interactions serve as “sacrifice domains” to dissipate energy and endow PVA-based hydrogel with high mechanical strength (≈16 MPa) and stretchability (≈1000%). Due to the reversible arranging and disassociating property of physical interactions, PVA–TA hydrogels show excellent shape memory performance. We further demonstrated an effective approach to fabricate strong and aligned PVA–TA thread. The resultant well-aligned PVA–TA dry thread reveals an ultrahigh mechanical tensile strength of up to 750 MPa, nearly 45 times higher than PVA–TA thread with no alignment. Wide-angle X-ray two-dimensional diffraction images further confirmed the alignment of PVA fibers in stretching direction. In addition, we applied the PVA–TA hydrogel as suture and evaluated the cytotoxicity and biocompatibility of the PVA–TA suture.
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