Closed-Loop Recyclable High-Performance Aerogels Derived from Polystyrene

IF 18.5 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Yufei Xiong, Chang-lin Wang, Lijie Dong, Željko Tomović
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Abstract

Upcycling of low valuable plastic waste into materials with enhanced properties helps progress toward establishing a plastics circular economy. Furthermore, implementing recyclability as a core design criterium for newly formed materials can significantly increase their impact on sustainability, yet rarely explored. In this work, the upcycling of polystyrene (PS) waste is presented into closed-loop recyclable high-performance aerogels. Through a simple post-functionalization process, PS is aminated to generate a polyfunctional amine, which is then reacted with aldehydes to form a recyclable cross-linked imine network. This network is subsequently dried to produce poly(styrene-imine) aerogels (PSAs). The resulting PSAs exhibit excellent thermally insulating properties, along with low density, outstanding mechanical strength, and intrinsic hydrophobicity. More importantly, these aerogels show quantitative depolymerization under acidic aqueous conditions, back to their original precursors which can be recovered in high yield and purity and reused for the synthesis of fresh aerogels with nearly identical material properties, thus achieving closed-loop recycling. This work presents an efficient method for upcycling of chemically non-recyclable plastics into recyclable and high value-added advanced aerogel materials, offering a new pathway for establishing a circular economy for plastics.

Abstract Image

由聚苯乙烯衍生的闭环可回收高性能气凝胶
将低价值的塑料废物升级为具有增强性能的材料有助于建立塑料循环经济。此外,将可回收性作为新成型材料的核心设计标准可以显著增加其对可持续性的影响,但很少被探索。本文介绍了聚苯乙烯(PS)垃圾的升级回收成闭环可回收的高性能气凝胶。通过简单的后功能化过程,PS被胺化生成多功能胺,然后与醛反应形成可回收的交联亚胺网络。该网络随后干燥,以生产聚苯乙烯-亚胺气凝胶(psa)。所得的psa具有优异的隔热性能、低密度、优异的机械强度和固有的疏水性。更重要的是,这些气凝胶在酸性水条件下进行了定量解聚,恢复到原来的前驱体,这些前驱体可以高收率和纯度地回收,并重新用于合成具有几乎相同材料性质的新鲜气凝胶,从而实现闭环循环。本研究提出了一种将化学不可回收塑料升级为可回收、高附加值的先进气凝胶材料的有效方法,为建立塑料循环经济提供了一条新的途径。
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来源期刊
Advanced Functional Materials
Advanced Functional Materials 工程技术-材料科学:综合
CiteScore
29.50
自引率
4.20%
发文量
2086
审稿时长
2.1 months
期刊介绍: Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.
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