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    高龙, 俞慧涛, 王健, 冯奕钰, 封伟. 基于氢键交联的低温自修复聚合物[J]. 功能高分子学报, 2020, 33(6): 547-553. doi: 10.14133/j.cnki.1008-9357.20200608001
    引用本文: 高龙, 俞慧涛, 王健, 冯奕钰, 封伟. 基于氢键交联的低温自修复聚合物[J]. 功能高分子学报, 2020, 33(6): 547-553. doi: 10.14133/j.cnki.1008-9357.20200608001
    GAO Long, YU Huitao, WANG Jian, FENG Yiyu, FENG Wei. Low-Temperature Self-Healing Polymer Based on Hydrogen Bonding Crosslinking[J]. Journal of Functional Polymers, 2020, 33(6): 547-553. doi: 10.14133/j.cnki.1008-9357.20200608001
    Citation: GAO Long, YU Huitao, WANG Jian, FENG Yiyu, FENG Wei. Low-Temperature Self-Healing Polymer Based on Hydrogen Bonding Crosslinking[J]. Journal of Functional Polymers, 2020, 33(6): 547-553. doi: 10.14133/j.cnki.1008-9357.20200608001

    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

    • 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。

       

      Abstract: 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.

       

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