Qian Yuehan, Dong Fuhao, Guo Lizhen, Lu Shanling, Xu Xu, Liu He
College of Chemical Engineering, Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, Jiangsu Key Lab of Biomass-Based Green Fuels and Chemicals, Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, 210037 Jiangsu Province, China.
Institute of Chemical Industry of Forestry Products, Key Laboratory of Biomass Energy and Material, National Engineering Laboratory for Biomass Chemical Utilization, Key and Open Laboratory of Forest Chemical Engineering, State Forestry Administration, Chinese Academy of Forestry, Nanjing, 210042 Jiangsu Province, China.
Biomacromolecules. 2023 Mar 13;24(3):1184-1193. doi: 10.1021/acs.biomac.2c01230. Epub 2023 Feb 21.
Polyurethane materials will come into contact with different solvents in daily life, and at the same time, they will be subject to different degrees of collision, wear and tear. Failure to take corresponding preventative or reparative measures will result in a waste of resources and an increase in costs. To this end, we prepared a novel polysiloxane with isobornyl acrylate and thiol groups as side groups, which was further used in the preparation of poly(thiourethane-urethane) materials. Thiourethane bonds generated by the click reaction of thiol groups with isocyanates endow poly(thiourethane-urethane) materials with the ability to heal and reprocess. Isobornyl acrylate with a large sterically hindered rigid ring promotes segment migration, accelerating the exchange of thiourethane bonds, which is beneficial to the recycling of materials. These results not only promote the development of terpene derivative-based polysiloxanes but also show the great potential of thiourethane as a dynamic covalent bond in the field of polymer reprocessing and healing.
聚氨酯材料在日常生活中会与不同的溶剂接触，同时，它们会受到不同程度的碰撞、磨损。不采取相应的预防或修复措施将导致资源浪费和成本增加。为此，我们制备了一种以丙烯酸异冰片酯和巯基为侧基的新型聚硅氧烷，并将其进一步用于制备聚（硫代聚氨酯-聚氨酯）材料。巯基与异氰酸酯的点击反应生成的硫代聚氨酯键赋予聚（硫代聚氨酯-聚氨酯）材料自愈和再加工的能力。具有大位阻刚性环的丙烯酸异冰片酯促进链段迁移，加速硫代聚氨酯键的交换，这有利于材料的回收利用。这些结果不仅促进了基于萜烯衍生物的聚硅氧烷的发展，还显示了硫代聚氨酯作为一种动态共价键在聚合物再加工和自愈领域的巨大潜力。
