具有双可逆动态键的高强度轻度闭环可回收环氧玻璃体

IF 7.4 2区 化学 Q1 POLYMER SCIENCE
Xingyu Liu , Xuanyue Hong , Yi Wang , Jun Lin , Jujun Ruan , Shaojian He
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引用次数: 0

摘要

目前,制约环氧树脂(EP)玻璃体可持续应用的主要因素是在高机械性能、高效回收能力和温和回收条件之间的内在权衡。为了应对这一挑战,我们设计了一种EP聚合物,它利用了亚胺键的高刚性和硼酯键的快速键交换,同时实现了高机械性能、高效的回收能力和温和条件下的可回收性。所得材料具有机械强度高达78.6 MPa、回收率高(130℃下破碎后热压两次循环回收率达90%)、温和的溶剂辅助闭环回收等特点。此外,用该聚合物制备的碳纤维增强聚合物(CFRPs)在50°C下30分钟内在(溶剂)中完全降解。回收的碳纤维(CF)保留了原始的表面形态,并保留了96%的原始机械性能,实现了高效和非破坏性的回收。这些发现突出了这种EP玻璃体体系的潜力,为聚合物材料的可持续发展提供了一个有希望的策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High strength and mildly closed-loop recoverable epoxy vitrimer with dual reversible dynamic bonds
Currently, the primary limitation hindering the sustainable application of epoxy (EP) vitrimers lies in the inherent trade-off among high mechanical performance, efficient recovery capability and mild recycling conditions. To address this challenge, we designed an EP polymer that leverages the high rigidity of imine bonds and the rapid bond exchange of boronic ester linkages, simultaneously achieving high mechanical performance, efficient recovery capability, and mild-condition recyclability. The resulting material exhibits a high mechanical strength of 78.6 MPa, excellent recovery efficiency (>90 % after two cycles of crushing and then hot-pressing at 130 °C), and mild solvent-assisted closed-loop recycling. Furthermore, carbon fiber-reinforced polymers (CFRPs) fabricated with this EP vitrimer demonstrated complete degradation in (solvent) within 30 min at 50 °C. The reclaimed carbon fibers (CF) retained pristine surface morphology and preserved 96 % of their original mechanical properties, enabling highly efficient and non-destructive recovery. These findings highlight the potential of this EP vitrimer system, offering a promising strategy for the sustainable development of polymer materials.
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来源期刊
Polymer Degradation and Stability
Polymer Degradation and Stability 化学-高分子科学
CiteScore
10.10
自引率
10.20%
发文量
325
审稿时长
23 days
期刊介绍: Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.
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