首页|Diselenide as a Dual Functional Mechanophore Capable of Stress Self-Reporting and Self-Strengthening in Polyurethane Elastomers

Diselenide as a Dual Functional Mechanophore Capable of Stress Self-Reporting and Self-Strengthening in Polyurethane Elastomers

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Unlike biological materials that can sense mechanical force and actively remodel locally,synthetic polymers typically break down under stress.Molecular-level responses to damage with both stress-reporting and self-strengthening functions are significant yet diffi-cult to realize for synthetic polymers.To overcome this challenge,chemo-mechanical coupling into poly-mers that can simultaneously ameliorate mechanical,optical,or other functional properties of a polymer combined with mechanical treatment will offer a new principle for materials design.Here,we report a kind of elastomer in which destructive forces are chan-nelled into productive and bond-forming reactions by using diselenide(Se-Se)as a mechanophore.Polyure-thane has been functionalized with labile Se-Se bonds,whose mechanical activation generates seleno radicals that trigger radical transfer and cross-linking reactions in situ.These reactions are activated effi-ciently in a mechanical way by compression in bulk materials.The resulting covalent networks possess turn-on mechano-fluorescence and increased moduli,which provide the functions of stress reporting,mechano-healing,and mechano-remodeling for the deformed film.This study not only illuminates the mechano-responsive nature of Se-Se bonds in the bulk state but also paves the way for the development of new stress-responsive materials.

diselenidemechano-responsive poly-mersself-strengtheningpolymer mechanochemistrystress sensing

Xiaopei Li、Fan Yang、Yiran Li、Cheng Liu、Peng Zhao、Yi Cao、Huaping Xu、Yulan Chen

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Department of Chemistry,Tianjin Key Laboratory of Molecular Optoelectronic Science,Tianjin University,Tianjin 300072

Department of Physics,Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructure,Nanjing University,Nanjing,Jiangsu 210093

Department of Chemistry,Key Laboratory of Organic Optoelectronics and Molecular Engineering,Tsinghua University,Beijing 100084

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

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国家自然科学基金国家自然科学基金国家重点研发计划国家重点研发计划

21734006219751782017YFA02078002017YFA0204503

2023

10.31635/ccschem.022.202201874

中国化学会会刊(英文)

中国化学会会刊(英文)

CSCD
ISSN：
年,卷(期)：2023.5(4)
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