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

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外文摘要：Polyimides are a family of high-tech plastics that have irreplaceable applications in the fields of aerospace,defense,and opto-electron-ics,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 poly-mer-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 com-parable 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 temper-ature of ≈220 ℃.Moreover,the PtM-CR-PⅡ plastic exhibits outstanding waterproofness,acid/alkali-resistance,and solvent-resistance,its appear-ance 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 ex-hibits 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-poly-mer circulation.

外文关键词：

Chemical recyclabilityPolyimidesPolyiminesDynamic imine bondsMechanical propertiesChemical stability

作者：

Zhen-Yu Wang、Xiao-Kong Liu

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作者单位：

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China

基金：

Natural Science Foundation of Jilin ProvinceNational Natural Science Foundation of ChinaNational Key R&D Program of China

项目编号：

***202302003222750692023YFA1008804

出版年：

2024

DOI：

10.1007/s10118-024-3199-0

高分子科学(英文版)

中国化学会　中国科学院化学研究所

高分子科学(英文版)

CSTPCD

影响因子：0.721

ISSN：0256-7679

年,卷(期)：2024.42(10)