Polymer-to-Monomers Chemically Recyclable Poly(imide-imine) Plastics with Extreme-Condition Resistance and Flame Retardancy

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Zhen-Yu Wang, Xiao-Kong Liu
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引用次数: 0

Abstract

Polyimides are a family of high-tech plastics that have irreplaceable applications in the fields of aerospace, defense, and opto-electronics, but polyimides are difficult to be reprocessed and recycled at the end of their service life, resulting in a significant waste of resources. Hence, it is of great significance to develop recyclable polyimides with comparable properties to the commercial products. Herein, we report a novel polymer-to-monomers chemically recyclable poly(imide-imine) (PtM-CR-PII) plastic, synthesized by cross-linking the amine-terminated aromatic bisimide monomer and the hexa-vanillin terminated cyclophosphazene monomer via dynamic imine bonds. The PtM-CR-PII plastic exhibits comparable mechanical and thermal properties as well as chemical stability to the commercial polyimides. The PtM-CR-PII plastic possesses a high Young’s modulus of ≈3.2 GPa and a tensile strength as high as ≈108 MPa, which also exhibits high thermal stability with a glass transition temperature of ≈220 °C. Moreover, the PtM-CR-PII plastic exhibits outstanding waterproofness, acid/alkali-resistance, and solvent-resistance, its appearance and mechanical properties can be well maintained after long-term soaking in water, highly concentrated acid and base, and various organic solvents. Furthermore, the cyclophosphazene moieties endow the PtM-CR-PII plastic with excellent flame retardancy. The PtM-CR-PII plastic exhibits the highest UL-94 flame-retarding rating of V-0 and a limiting oxygen index (LOI) value of 45.5%. Importantly, the PtM-CR-PII plastic can be depolymerized in an organic solvents-acid mixture medium at room temperature, allowing easy separation and recovery of both monomers in high purity. The recovered pure monomers can be used to regenerate new PtM-CR-PII plastics, enabling sustainable polymer-monomers-polymer circulation.

具有极端条件耐受性和阻燃性的聚合物-单体化学可回收聚(亚胺-亚胺)塑料
聚酰亚胺是一系列高科技塑料,在航空航天、国防和光电子领域有着不可替代的应用,但聚酰亚胺在使用寿命结束后很难再加工和回收,造成大量资源浪费。因此,开发与商用产品性能相当的可回收聚酰亚胺具有重要意义。在此,我们报告了一种新型聚合物-单体化学可回收聚(亚胺-亚胺)(PtM-CR-PII)塑料,它是通过动态亚胺键交联胺端芳香族双亚胺单体和六香兰素端环磷腈单体而合成的。PtM-CR-PII 塑料具有与商用聚酰亚胺相当的机械性能、热性能和化学稳定性。PtM-CR-PII 塑料的杨氏模量高达 ≈3.2 GPa,拉伸强度高达 ≈108 MPa,同时还具有较高的热稳定性,其玻璃化转变温度为 ≈220 ℃。此外,PtM-CR-PII 塑料还具有出色的防水性、耐酸碱性和耐溶剂性,在水、高浓度酸碱和各种有机溶剂中长期浸泡后仍能保持良好的外观和机械性能。此外,环磷苯基还赋予了 PtM-CR-PII 塑料优异的阻燃性。PtM-CR-PII 塑料的最高 UL-94 阻燃等级为 V-0,极限氧指数(LOI)值为 45.5%。重要的是,PtM-CR-PII 塑料可以在室温下在有机溶剂-酸混合物介质中解聚,从而可以轻松分离和回收高纯度的两种单体。回收的纯单体可用于再生新的 PtM-CR-PII 塑料,实现聚合物-单体-聚合物的可持续循环。
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来源期刊
Chinese Journal of Polymer Science
Chinese Journal of Polymer Science 化学-高分子科学
CiteScore
7.10
自引率
11.60%
发文量
218
审稿时长
6.0 months
期刊介绍: Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.
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