Hard, tough and fast self-healing thermoplastic polyurethane

编号 020031704

推送时间 20211115

研究领域 林产化工 

年份 2021 

类型 期刊 

语种 英语

标题 Hard, tough and fast self-healing thermoplastic polyurethane

来源期刊 Progress in Organic Coatings

期 第317期

发表时间 20210702

关键词 Hard and tough;  Self-healing;  Thermoplastic polyurethane;  Disulfide metathesis; 

摘要 It's necessary to develop self-healing polymers, which will significantly improve the safety and service life of artificial materials. Although extensive research efforts have been devoted to the field, it is still a challenge to synthesize hard and tough polymers, which own self-healing ability under mild conditions. In this work, we fabricated a hard and tough?thermoplastic?polyurethane?(TPU, PCL-HM) and the wound of PCL-HM can be quickly healed under mild conditions (50?°C). Comprehensive characterization results suggest that the?Young's modulus,?tensile strength?and elongation at break of PCL-HM can reach 76?MPa, 11.8?MPa and 841%, respectively, which is better than most recently reported TPUs. PCL-HM prepared with aromatic disulfide bonds as dynamic covalent bonds, polycaprolactone diol (PCL-2000) as soft segment, isophorone diisocyanate (IPDI) and dicyclohexylmethane-4,4′-diisocyanate (HMDI) as hard segment, can quickly recover to 92% of its original tensile strength within 1?h at 50?°C. Due to the better segment movement and looser packing of aromatic disulfide in PCL-HM, the PCL-HM displays better healing properties compared with other types of TPUs (PCL-I, PCL-H, PCL-M, PCL-HM′) prepared in this work. In addition, the fast healing properties of PCL-HM under mild conditions endow it with great application prospects in the field of protective coatings. The successful preparation of PCL-HM also provides a new idea for the synthesis of hard and tough TPU.

服务人员 尚玮姣

服务院士 宋湛谦

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