Yaning Ma , Zihan Zhao , Zhiran Zheng , Jiawei Li , Min-Hui Li , Jun Hu
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引用次数: 0
摘要
由天然硫辛酸(TA)制成的聚合物为开发可持续材料提供了一种解决方案。然而,其固有的弱网络使其难以用于具有高耐久性和机械坚固性的工程材料。在这项工作中,通过将 4,5-环氧环己烷-1,2-二甲酸二缩水甘油酯(DGEDC)与 TA 和双(对氨基环己基)甲烷(PACM)固化,设计出了自催化双动力共价适应网络(CANs)。由此产生的 DGEDC/TA/PACM 热固性材料具有良好的机械性能和热性能(Tg 为 145°C,Td5% 为 289°C,拉伸强度为 70 兆帕,杨氏模量为 2.25 GPa),高于以前的聚硫辛酸基材料。由于二硫键交换和叔胺催化的酯交换反应引起的拓扑网络重排,它们可以很容易地重塑和修复。此外,它们还能被温和降解,并通过原位发泡被再生为聚氨酯泡沫。这种自催化双动力 CAN 的策略将为聚硫辛酸的实际应用开发带来启发。
High-performance poly(thioctic acid)-based thermosets featuring upcycling ability for in situ foaming enabled by dual-dynamic networks
Polymers constructed from natural thioctic acid (TA) provide a solution for the development of sustainable materials. However, their inherent weak networks make them difficult to use in engineering materials featuring high durability and mechanical robustness. In this work, the autocatalytic dual-dynamic covalent adaptable networks (CANs) are devised by curing diglycidyl 4,5-epoxycyclohexane-1,2-dicarboxylate (DGEDC) with TA and bis(p-aminocyclohexyl)methane (PACM). The resulting DGEDC/TA/PACM thermosets exhibit good mechanical and thermal properties (Tg of 145°C, Td5% of 289°C, tensile strength of 70 MPa, Young’s modulus of 2.25 GPa), higher than previous poly(thioctic acid)-based materials. Due to topological network rearrangements induced by the exchange of disulfide bonds and tertiary amine-catalyzed transesterification reactions, they can be easily reshaped and repaired. Furthermore, they can be degraded mildly and upcycled into polyurethane foam by in situ foaming. This strategy of autocatalytic dual-dynamic CANs will inspire the development of practical applications of poly(thioctic acid).
期刊介绍:
Matter, a monthly journal affiliated with Cell, spans the broad field of materials science from nano to macro levels,covering fundamentals to applications. Embracing groundbreaking technologies,it includes full-length research articles,reviews, perspectives,previews, opinions, personnel stories, and general editorial content.
Matter aims to be the primary resource for researchers in academia and industry, inspiring the next generation of materials scientists.