【Chem. Eng. J.】Covalent co-crosslinking of guanidine urea and phosphoramidate motifs enables creep-resistant, recyclable and flame-retardant thermosetting polyurea
作者：Songyue Cheng, Zhen Yu, Jinping Ni, Zhaobin Tang, Yanlin Liu
關(guān)鍵字：Covalent adaptive networksGuanidine ureaCreep resistanceRecyclableFlame retardant
論文來源：期刊
發(fā)表時間：2025年
Covalent adaptive networks generally suffer from insufficient creep resistance, mechanical strength, and flame retardancy. In this work, a dense GPAPUA dynamic crosslinking network was designed and synthesized through a one pot co-crosslinking strategy, integrating guanidine urea and phosphoramide motifs. Its synergistic covalent co-crosslinking design endowed the network with excellent creep resistance, reprocessability, and flame retardancy. Compared to commercial polyaspartic polyurea, GPAPUA exhibits 1.7-fold higher tensile strength and 2.3-fold greater modulus. The initial creep temperature increases from 40 °C to 80 °C, while the limiting oxygen index (LOI) rises from 25.1 % to 31.6 %, achieving UL-94 V-0 rating. Complete reprocessing is attained after hot-pressing at 180 °C for 1 h under a pressure of 10 MPa. This work establishes a straightforward and efficient approach to fabricating dimensionally stable, recyclable, and fire-resistant thermosets, showcasing promise as a sustainable alternative to commercial ployaspartic polyurea.