基于氢键交联的低温自修复聚合物  

Low-Temperature Self-Healing Polymer Based on Hydrogen Bonding Crosslinking

作　　者：高龙 俞慧涛 王健[2] 冯奕钰[1,3] 封伟 GAO Long;YU Huitao;WANG Jian;FENG Yiyu;FENG Wei(School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China;Beijing Institute of Systems Engineering,Beijing 100101,China;Key Laboratory of Materials Processing and Mold,Ministry of Education,Zhengzhou University,Zhengzhou 450002,China)

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]北京系统工程研究所,北京100101 [3]郑州大学材料加工与模具教育部重点实验室,郑州450002

出　　处：《功能高分子学报》2020年第6期547-553,共7页Journal of Functional Polymers

基　　金：国家自然科学基金重点项目(51633007);国家自然科学基金面上项目(51973152)。

摘　　要：针对聚合物存在的低温自修复速率低的问题,通过将具有柔性分子链的氨基封端的聚二甲基硅氧烷(PDMS)和丙二酰氯(C3H2Cl2O2)进行缩聚,制备得到多重氢键交联的聚二甲基硅氧烷交联聚合(H2PDMS)网络。柔性分子链有效降低了聚合物的玻璃化转变温度(Tg≈−120℃);H2PDMS在−25℃环境下,40 min后拉伸模量的修复效率高达97%。通过N―H和C=O之间多个氢键的可逆断裂与形成,实现了聚合物的室温快速修复以及低温高效修复,对未来设计并制备极端低温环境下修复材料具有重要意义。In some extreme environments,polymers are easy to suffer from irreversible damage or degradation,which increases potential safety problems and reduces the service life of the materials.Regarding to the problem of low self-healing rate of the polymer at low temperature,the polymer network with cross-linked multiple hydrogen bonds was prepared by mixing up the polydimethylsiloxanes with amino-terminated flexible molecular chains and malonyl chloride,which were subjected to condensation polymerization at the temperature of−5℃and in Ar atmosphere.The flexible molecular chain effectively reduces the glass transition temperature(Tg≈−120℃),indicating that the molecular chain's ability to move still exists under the low temperature conditions,and it is a prerequisite for polymers to self-heal under low temperature conditions.The results show that the self-healing efficiency of the tensile strength of the polydimethylsiloxane cross-linked polymer at−25℃after 40 min is as high as 97%.Through the reversible fracture and formation of multiple hydrogen bonds between N—H and C=O,the rapid self-healing of polymers at room temperature and high-efficiency self-healing at low temperature can be achieved.This study will provide an insight for further preparation of the autonomous self-healing materials under the extreme environments in the future.

关 键 词：低温自修复 缩合聚合 多重氢键 交联 

分 类 号：O634.4[理学—高分子化学]