Insertion of Supramolecular Segments into Covalently Crosslinked Polyurethane Networks towards the Fabrication of Recyclable Elastomers  

作　　者：Lu-Ping Wang Ming-Guang Zhang Jing-Cheng Hao Xu Wang 

机构地区：[1]National Engineering Research Center for Colloidal Materials,School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China [2]Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education,School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China

出　　处：《Chinese Journal of Polymer Science》2022年第3期321-330,I0009,共11页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No. 21975145)。

摘　　要：Thermoset plastics have become one of the most important chemical products in the world. The consequent problem is that although the thermosets possess excellent performance in mechanical strength, they cannot be reprocessed because of the internal permanent network structures. Optimizing the molecular design of thermosets is one of the most feasible ways to improve their recyclability. Here we present a facile and robust strategy to engineer the reprocessability of thermoset polyurethanes without compromising their mechanical toughness and chemical resistance via adding supramolecular additives during the polymer synthesis process. By using a multiple hydrogen bonding moiety as the model supramolecular additive, we demonstrate that the mechanical properties, recyclability, and chemical resistance of the crosslinked polyurethanes can be precisely controlled by adjusting the contents of the supramolecular additive. Systematic studies on the relations between molecular design and material properties are performed, and the optimized polyurethane network with a moderate amount of the supramolecular additive achieves the right balance between the robustness and recyclability. This work provides a cost-effective and practical way to chemically engineer thermoset plastics, aiming to enable the recycling of mechanically tough and chemically stable polymer materials.

关 键 词：Thermoset plastics RECYCLABILITY POLYURETHANE Supramolecular additives Chemical resistance 

分 类 号：TQ334.1[化学工程—橡胶工业] O641.3[理学—物理化学]