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Long-chain polyamide covalent adaptable networks based on renewable ethylene brassylate and disulfide exchange
Polymer Chemistry ( IF 4.1 ) Pub Date : 2021-09-23 , DOI: 10.1039/d1py00811k Charalampos Pronoitis 1 , Minna Hakkarainen 1 , Karin Odelius 1
Polymer Chemistry ( IF 4.1 ) Pub Date : 2021-09-23 , DOI: 10.1039/d1py00811k Charalampos Pronoitis 1 , Minna Hakkarainen 1 , Karin Odelius 1
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Conventional thermosets cannot be recycled once they reach their end-of-life creating unavoidable waste. Covalent adaptable networks (CANs) are a promising circular solution as they can be reprocessed by conventional techniques employed for processing thermoplastics. In this work, strong and chemically resistant, long-chain polyamide (PA) CANs were developed by introducing intrinsically reactive disulfides in PA networks. Following a solvent-free strategy and utilizing ethylene brassylate, a renewable cyclic diester, our approach brings together the high strength and chemical resistance of long-chain, crosslinked PAs with the reprocessability of dynamic networks in a sustainable fashion. The structure of the PA CANs was elucidated by X-ray diffraction analysis, and the effect of the disulfides on the thermal, mechanical, viscoelastic and dynamic properties was evaluated. The PA CANs had high gel content (86–98%) and they were reprocessable over three grinding-compression molding cycles, retaining their strength (15–20 MPa), crosslink density and gel content. They exhibited rapid stress relaxation with relaxation times as low as 1.06 s and were healable within 5 min. The long-chain PA CANs are easy to prepare and feature several elements of sustainable materials design, highly valued in plastics’ circular economy.
中文翻译：
长链聚酰胺共价适应性网络基于可再生乙烯乙二酯和二硫化物交换
传统的热固性塑料一旦达到使用寿命就无法回收，从而产生不可避免的浪费。共价自适应网络 (CAN) 是一种很有前途的循环解决方案，因为它们可以通过用于加工热塑性塑料的常规技术进行再加工。在这项工作中，通过在 PA 网络中引入本征反应性二硫化物，开发了坚固且耐化学腐蚀的长链聚酰胺 (PA) CAN。遵循无溶剂策略并利用可再生的环二酯乙二酯，我们的方法以可持续的方式将长链交联 PA 的高强度和耐化学性与动态网络的可再加工性结合在一起。通过 X 射线衍射分析阐明了 PA CAN 的结构，以及二硫化物对热、机械、评估粘弹性和动态性能。PA CAN 具有高凝胶含量 (86-98%)，并且它们可以在三个研磨-压缩成型循环中再加工，保持其强度 (15-20 MPa)、交联密度和凝胶含量。它们表现出快速应力松弛，松弛时间低至 1.06 秒，并且可在 5 分钟内愈合。长链 PA CAN 易于制备，并具有可持续材料设计的多个元素，在塑料循环经济中受到高度重视。
更新日期：2021-09-23
中文翻译：
长链聚酰胺共价适应性网络基于可再生乙烯乙二酯和二硫化物交换
传统的热固性塑料一旦达到使用寿命就无法回收，从而产生不可避免的浪费。共价自适应网络 (CAN) 是一种很有前途的循环解决方案，因为它们可以通过用于加工热塑性塑料的常规技术进行再加工。在这项工作中，通过在 PA 网络中引入本征反应性二硫化物，开发了坚固且耐化学腐蚀的长链聚酰胺 (PA) CAN。遵循无溶剂策略并利用可再生的环二酯乙二酯，我们的方法以可持续的方式将长链交联 PA 的高强度和耐化学性与动态网络的可再加工性结合在一起。通过 X 射线衍射分析阐明了 PA CAN 的结构，以及二硫化物对热、机械、评估粘弹性和动态性能。PA CAN 具有高凝胶含量 (86-98%)，并且它们可以在三个研磨-压缩成型循环中再加工，保持其强度 (15-20 MPa)、交联密度和凝胶含量。它们表现出快速应力松弛，松弛时间低至 1.06 秒，并且可在 5 分钟内愈合。长链 PA CAN 易于制备，并具有可持续材料设计的多个元素，在塑料循环经济中受到高度重视。
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