<br>具有自修复和再加工能力的端羟基聚丁二烯聚氨酯,ACS Omega

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具有自修复和再加工能力的端羟基聚丁二烯聚氨酯
ACS Omega ( IF 3.7 ) Pub Date : 2022-03-15 , DOI: 10.1021/acsomega.1c06416
Jiawei Li ₁ , Zhao Ning ₁ , Weiming Yang ₁ , Bin Yang ₁ , Yanning Zeng ₁

Affiliation

羟基封端聚丁二烯（HTPB）基聚氨酯（PU）网络在各种应用中发挥着不可或缺的作用；然而，它们无法进行再加工，从而导致环境问题和不可持续的工业发展。在这项工作中，通过引入交联剂 2,2′-(1,4-亚苯基)-双[4-硫醇-1,3,2，制备了可回收的基于 HTPB 的 PU vitrimer (HTPB-PU _V ) 网络。 -二氧硼杂硼烷](BDB)与动态硼酸酯键结合成网络。同时，BDB可以通过消除双键来稳定网络中的HTPB单元。新型HTPB-PU _V网络是通过硫醇-烯“点击”反应以及HTPB与交联剂BDB和异氰酸酯（HDI）之间的加成反应构建的。动态 HTPB-PU _V网络通过动态机械分析 (DMA) 和傅里叶变换红外 (FTIR) 进行表征。所获得的动态HTPB-PU _V网络具有优异的热稳定性。此外，由于动态硼酸酯键的存在，HTPB-PU _V网络拓扑结构可以改变，有助于最终聚合物的再加工、自修复和焊接能力。通过热压机，粉碎后的样品可以进行多次循环再加工，再加工后的样品力学性能与原始样品相似，拉伸强度更高。自修复样品在 130°C 下修复处理 3 小时后几乎完全从头开始恢复。此外，焊接效率达到120%。

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Hydroxyl-Terminated Polybutadiene-Based Polyurethane with Self-Healing and Reprocessing Capabilities

Hydroxyl-terminated polybutadiene (HTPB)-based polyurethane (PU) networks play indispensable roles in a variety of applications; however, they cannot be reprocessed, resulting in environmental problems and unsustainable industrial development. In this work, recyclable HTPB-based PU vitrimer (HTPB-PU_V) networks are fabricated by introduction of a cross-linker 2,2′-(1,4-phenylene)-bis[4-mercaptan-1,3,2-dioxaborolane] (BDB) with dynamic boronic ester bonds into the network. Meanwhile, the BDB can stabilize the HTPB unit in the network by elimination of double bonds. The novel HTPB-PU_V networks are constructed by a thiol-ene “click” reaction and an addition reaction between HTPB and cross-linker BDB and isocyanates (HDI). The dynamic HTPB-PU_V networks are characterized by dynamic mechanical analysis (DMA) and Fourier transform infrared (FTIR). The obtained dynamic HTPB-PU_V networks possess superior thermostability. Moreover, due to the presence of dynamic boronic ester bonds, the HTPB-PU_V network topologies can be altered, contributing to the reprocessing, self-healing, and welding abilities of the final polymer. Through a hot press, the pulverized sample can be reprocessed for several cycles, and mechanical properties of the reprocessed samples are similar to those of the pristine one, with the tensile strength being even higher. The self-healed sample exhibits almost complete recovery from scratch after the healing treatment at 130 °C for 3 h. Moreover, a welding efficiency of 120% was achieved.

更新日期：2022-03-15

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