摘要
将E51环氧树脂引入基于Diels-Alder反应的热可逆聚氨酯,制备出环氧树脂改性热可逆自修复聚氨酯材料。引入环氧树脂,可提高改性热可逆聚氨酯的拉伸强度、杨氏模量、冲击韧性和邵氏硬度且保持较高的断裂伸长率。添加20%的环氧树脂制备的环氧树脂改性热可逆聚氨酯材料兼具优异的强度、韧性、硬度等力学性能和良好自修复性能。当环氧树脂改性热可逆聚氨酯出现裂纹裂缝等损伤后,在130℃处理20 min及60℃处理24 h便可修复损伤,并可实现同一部位多次损伤的重复自修复。力学性能提高的原因,是刚性环氧树脂相与聚氨酯弹性相相互缠结形成互穿聚合物网络结构产生的“强迫互溶”和“协同效应”;而多次重复自修复则归因于热可逆Diels-Alder反应和分子链热运动的协同作用。
An epoxy resin modified thermo-reversible polyurethane with self-healing ability was manufactured successfully by introducing E51 epoxy resin into Diels-Alder reaction-based thermo-reversible polyurethane.The tensile strength,Young's modulus,impact toughness and Shore hardness of the thermo-reversible polyurethane were significantly enhanced,while the elongation at break of which was remained at a relatively high level after epoxy resin was introduced.The 20%epoxy resin-modified thermoreversible polyurethane material presents high mechanical properties such as strength,toughness and hardness,as well as excellent self-healing characteristic.If damages such as cracks and crevices have been accidently emerged on the epoxy resin modified thermal reversible polyurethane,such damaged spots can be recovered through a post heat treatment by either 130℃×20 min or 60℃×24 h.Moreover,such repair may be allowed to repeat several times for the same location after being subjected to repeatedly damages.It is believed that the enhancement of mechanical performance of the epoxy resin modi-fied thermal reversible polyurethane may be ascribed to the so called"forced mutual dissolution"and"synergistic effect",resulted from the interpenetrating polymer network structure formed through entanglement of the rigid phase of epoxy and the elastic polyurethane phase of polyurethane.Meanwhile,the repeatable self-healing of the epoxy resin modified thermal reversible polyurethane may be due to the synergistic effect of the thermo-reversible Diels-Alder reaction and the thermal movement of molecular chains.
作者
叶姣凤
王飞
左洋
张钧翔
罗晓晓
冯利邦
YE Jiaofeng;WANG Fei;ZUO Yang;ZHANG Junxiang;LUO Xiaoxiao;FENG Libang(School of Materials Science and Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510641,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2023年第4期257-263,共7页
Chinese Journal of Materials Research
基金
国家自然科学基金(51463010)。
