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用溶剂触发的化学回收离子导电和自我愈合的聚氨共价适应网络

Jihong Lyu¹, Gyujin Song², Hyocheol Jung¹

¹Center for Specialty Chemicals, Division of Specialty and Bio-Based Chemicals Technology, Korea Research Institute of Chemical Technology (KRICT), Ulsan 44412, Republic of Korea.

ACS applied materials & interfaces

|December 21, 2023

概括

新的聚氨共价适应网络 (CAN) 可以回收和自我修复. 这些可适应的聚合物在特定条件下解离和重塑,为热固塑料废物提供可持续的解决方案,并使导膜等新应用成为可能.

科学领域:

聚合物化学聚合物化学
材料科学材料科学材料科学
可持续化学可持续化学

背景情况:

全球塑料废弃物对环境构成重大挑战.
由于其永久的交叉连接结构,回收热固聚合物是很困难的.
协价自适应网络 (CAN) 通过可逆网络解离和重建提供了一个潜在的解决方案.

研究的目的:

开发具有可回收和自我修复特性的新型聚氨CAN.
研究这些CAN的解离和重建机制.
探索这些CAN在诸如离子导体材料等应用中的潜力.

主要方法:

聚氨CANs的合成,具有聚二硫化链接.
在高温下使用特定溶剂 (DMF,DMSO或THF-DMF混合物) 解离聚合物网络.
聚合物网络的重建通过UV光诱导的dithiolane组的环开放.
材料属性的表征,包括热稳定性,机械性能和离子导电性.

主要成果:

开发的聚氨CAN在60°C下在1小时内在DMF或DMSO中表现出高效的网络解离,甚至在THF中DMF的低度下也是如此.
分离网络可以在紫外线 (365 nm) 下以高产量重建.
CAN膜具有良好的热稳定性,机械性能,可回收性和自我修复能力.
加入LiTFSI盐的结果是具有7.48 × 10−4 S cm−1.4的最大导电率的离子导电CAN薄膜.

结论:

新型聚氨CANs为回收热固化聚合物提供了一个可行的途径.
在温和条件下解离和重建网络的能力减少了对苛刻溶剂的依赖.
由此产生的材料具有用于先进应用的理想特性,包括自我修复和离子导电性.

关键词:

化学回收化学回收化学回收协价自适应网络是共价自适应网络.这些是二硫化物.离子导电薄膜是一种导离子薄膜.它具有自我愈合的功能.

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