Room temperature readily self-healing polymer via rationally designing molecular chain and crosslinking bond for flexible electrical sensor.
Room temperature readily self-healing polymer via rationally designing molecular chain and crosslinking bond for flexible electrical sensor.
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DOI：
10.1016/j.jcis.2019.10.019
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发表时间：
2020-02
影响因子：
9.9
通讯作者：
Xianzhang Wu;Jinqing Wang;Jingxia Huang;Shengrong Yang
中科院分区：
文献类型：
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作者：
Xianzhang Wu;Jinqing Wang;Jingxia Huang;Shengrong Yang
具有优异室温自修复能力的机械坚韧聚合物在软电子、电子皮肤和柔性储能器件中引起了人们的强烈兴趣。然而，由于缓慢的扩散动力学，实现这样的聚合物仍然是一个挑战。本文以2，4 ′-甲苯二异氰酸酯、异佛尔酮二异氰酸酯和聚氧-1，4-丁二醇为原料，通过一锅法合成了一种具有良好自修复性能的高分子材料，该材料通过合理调节分子链段的硬度和动态交联键的强度来实现。聚（氧-1，4-丁二基）作为软链段可以有效地避免微相分离，使聚合物在室温下快速链移动。此外，2，4 ′-甲苯二异氰酸酯链段的双氢键作为较强的交联键，有助于提高材料的机械强度，而异佛尔酮二异氰酸酯链段较弱的单氢键可通过键断裂有效地耗散应变能，赋予聚合物快速的室温自修复能力。具有强大的应力强度（1.3 MPa），高自愈效率（97%，6小时内），和大的拉伸应变（2100%）的最先进的，所得到的聚合物用于可拉伸和自愈合的电传感器，可用于监测各种生理活动在真实的时间的制造。所描述的策略是有前途的和普遍的可愈合材料，显示出巨大的潜力，发展软电子。
Mechanically tough polymers with excellent room temperature self-healing capacity have aroused strong interest in soft electronics, electronic skins and flexible energy storage devices. However, achieving such polymers remains a challenge due to tardy diffusion dynamics. Herein, a robust and readily self-healing polymer, which is synthesized by one-pot polymerization among 2,4′-tolylene diisocyanate, isophorone diisocyanate, and poly(oxy-1,4-butanediyl), is achieved through reasonably tuning the hardness of the molecular segment and the strength of the dynamic crosslinking bond. The poly(oxy-1,4-butanediyl) that act as a soft segment can effectively avoid the microphase separation, enabling rapid chain mobility of the polymer at the room temperature. Furthermore, the dual H-bonding from 2,4′-tolylene diisocyanate segment acting as a relatively strong crosslinking bond contributes to high mechanical strength, while the weaker single H-bonding from isophorone diisocyanate segment can efficiently dissipate strain energy by bond rupture, endowing the polymer with rapid room temperature self-healing ability. Featuring state-of-the-art of robust stress strength (≈1.3 MPa), high self-healing efficiency (97% within 6 h), and large tensile strain (≈2100%), the resulting polymers are used for the fabrication of stretchable and self-healable electrical sensor, which can be employed to monitor a variety of physiological activities in real time. The described strategy is promising and universal for healable materials, displaying great potential for developing soft electronics.