Tuning hard phase towards synergistic improvement of toughness and self-healing ability of poly(urethane urea) by dual chain extenders and coordinative bonds

韧性 材料科学 极限抗拉强度 相(物质) 复合材料 高分子化学 热塑性聚氨酯 聚合物 自愈 化学工程 氢键 有机化学 化学 弹性体 分子 医学 替代医学 病理 工程类
作者
Yu-han Li,Wenjuan Guo,Wenjuan Li,Xin Liu,Hao Zhu,Jinping Zhang,Xingjiang Liu,Liuhe Wei,Ailing Sun
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:393: 124583-124583 被引量:92
标识
DOI:10.1016/j.cej.2020.124583
摘要

Abstract It is challenging to simultaneously improve the toughness and self-healing ability of thermoplastic polyurethane (TPU) due to mutually exclusive dependence on chain motion and hard phase. In this work, a novel poly(urethane urea) (PUU) was synthesized by using 2, 6-diamimopyridine (Py) and cystamine (Cy) as chain extenders and subsequently complexed with Zn2+ ions. It is revealed that the pyridine moieties together with formation of coordinative bonds significantly influences microphase separation by interfering with hydrogen bonding. A Py/Cy molar ratio of 1:2 is optimal to remarkably improve the toughness and self-healing ability. Specifically, its tensile strength, toughness and self-healing efficiency simultaneously improve to 9.40 ± 0.10 MPa, 64.49 ± 1.75 MJ/m3, and 96.64 ± 1.52% with 92%, 139% and 29% increment compared to PUU-Cy, respectively. The synergistic enhancing effect is the consequence of compromised hard phase and coordinative bonds. Firstly, decrease of hard domain content leads to loosely packed hard segments dispersing in soft phase, facilitating disulfide exchange. Secondly, the coordinative bonds serving as dynamic crosslinking joints not only restrict chain dislocation but also contribute to better self-healing ability than hydrogen bonds. An electrode film derived from embedding silver nanowires (AgNWs) into this material exhibits self-repairable and robust sensing properties due to reconstructing conducting network by self-healable matrix. This unique feature endows it with a great potential in the field of flexible electronics and wearable devices.
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