A facile strategy for multiple dynamic polyurethane with high mechanical strength, room-temperature healability and recoverability

被引:0
作者
Xu, Hongzhi [1 ,2 ]
Zhai, Runsha [3 ]
Hao, Zhiwei [2 ]
Wang, Chengwen [1 ]
Zhang, Jianhua [3 ,4 ]
机构
[1] China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China
[2] CNPC Engn Technol Res Co Ltd, Tianjin 300451, Peoples R China
[3] Tianjin Univ, Sch Chem Engn & Technol, Dept Polymer Sci & Engn, Key Lab Syst Bioengn,Minist Educ, Tianjin 300350, Peoples R China
[4] Tianjin Univ, Tianjin Key Lab Membrane Sci & Desalinat Technol, Tianjin 300350, Peoples R China
关键词
Polyurethane; Dynamic covalent bonds; Acylsemicarbazide bonds; Disulfide bonds; Room-temperature healability; BORONIC ESTER; DISULFIDE; ELASTOMERS; COMPOSITES;
D O I
10.1016/j.reactfunctpolym.2025.106216
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The introduction of self-healability and recoverability into widely used polymer materials such as polyurethane has become an important way to increase their service lifetime and decrease the amount of waste to solve the pollution problems. However, it remains a formidable challenge to integrate robust mechanical properties with room-temperature self-healability and recoverability due to the proverbial trade-off between robustness and flexibility of polymer chains. In this study, a kind of multiple dynamic polyurethane (MDPU) consisted of dynamic acylsemicarbazide bonds and disulfide bonds as well as multiple hydrogen bonds derived from acylsemicarbazide bonds was readily prepared by the reaction between 3,3 '-dithiodipropionate as multifunction chain extender and an isocyanate-terminated prepolymer. The chain structures and physicochemical properties were fully investigated. The results demonstrated that colorless transparent MDPU can not only possess high strength (>17 MPa), high stretchability (>700 %) and high toughness (>57 MJ & sdot;m(-3)), but also exhibit a high selfhealability (healing efficiency over 70 % at 25 degrees C under the assistance of drops of N, N-dimethylformamide) and a good recoverability (almost completely recovered after thermocompression at 110 degrees C for 1 h). Considering the cheap and widely available resource and facile synthesis process, the strategy designed herein also provides a promising and cost-effective approach to readily fabricate self-healable polyurethane with desirable multifunctionality.
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页数:10
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