摘要
以聚丙二醇(PPG)为软段,异佛尔酮二异氰酸酯(IPDI)为硬段构建聚氨酯主链,然后将1,4-丁二醇(BDO)和2,2’-二氨基二苯二硫醚(DTDA)作为扩链剂嵌入聚氨酯主链中,制备一种具有高强度、刺激条件温和且能快速修复的基于二硫键和氢键协同作用的聚氨酯(PU)弹性体。采用红外光谱、拉曼光谱、热分析、力学测试及光学显微观察对其结构和性能进行表征,研究了软硬段比、修复时间和修复温度对PU力学性能和自修复性能的影响。实验结果发现,所制备的PU具有很高的断裂伸长率(2398%)、断裂强度(8.84MPa)以及抗穿刺性能。同时PU在温和的刺激条件下具有优异的自修复性能,其修复效率与修复时间和修复温度呈正比,硬段质量分数为44.26%的试样经70℃加热3h后,断裂强度可恢复到原始试样的92.7%。再处理试验的结果表明,该PU可以通过热压实现循环利用,回收率高达98.8%。此外,该自修复PU弹性体可作为柔性基底应用于可穿戴传感器来监测人体肢体运动。
The polyurethane(PU) elastomer with high strength, mild irritation conditions and rapid repair based on the synergistic action of disulfide and hydrogen bonds was prepared. Starting from molecular structure design, poly(propylene glycol)(PPG) was used as a soft segment and isophorone diisocyanate(IPDI) as a hard segment to construct a polyurethane backbone, and then 1, 4-butanediol(BDO) and 2,2’-diaminodiphenyl disulfide(DTDA) were embedded in the polyurethane backbone as chain extenders. The structure and properties were characterized by infrared spectroscopy, Raman spectroscopy,thermal analysis, mechanical testing and optical microscopy. The effects of the ratio of soft to hard segments,repair time and repair temperature on the mechanical properties and self-healing properties of PU were studied. The results showed that the self-healing polyurethane had high elongation at break of 2398%,fracture strength of 8.84MPa and puncture resistance. At the same time, the PU had excellent self-healing properties under mild stimulation conditions, and its repair efficiency was directly proportional to the repair time and repair temperature. The fracture strength of the specimen with 44.26% mass fraction of hard segment content could be recovered to 92.7% of the original specimen by heating at 70℃ for 3h.Reprocessing tests indicated that PU could also be recycled by hot pressing with a recovery rate of 98.8%.Furthermore, the self-healing PU elastomer could be used as a flexible substrate for wearable sensors to monitor human limb movements.
作者
席慧敏
钱坤
俞科静
李杰
张中威
熊自明
张耀良
XI Huimin;QIAN Kun;YU Kejing;LI Jie;ZHANG Zhongwei;XIONG Ziming;ZHANG Yaoliang(Key Laboratory of Eco-Textiles,Ministry of Education,Jiangnan University,Wuxi 214122,Jiangsu,China;State Key Laboratory of Blast Impact Disaster Prevention and Mitigation,Army Engineering University,Nanjing 210007,Jiangsu,China;R&D Department of Jiangsu Changjiang Blasting Engineering Co.,Ltd.,Zhenjiang 212011,Jiangsu,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2023年第2期934-943,共10页
Chemical Industry and Engineering Progress
基金
连云港市重大技术攻关-揭榜挂帅项目(CGJBGS2104)
镇江市重点研发计划(GY2021009)。
关键词
聚氨酯
二硫键
氢键
自修复
可穿戴传感器
polyurethane
disulfide bond
hydrogen bond
self-healing
wearable sensor
作者简介
第一作者:席慧敏(1997-),女,硕士研究生,研究方向为自修复材料。E-mail:1132752394@qq.com;通信作者:俞科静,教授,硕士生导师,研究方向为安全防护材料。E-mail:yukejing@jiangnan.edu.cn。
