Breaking barriers:Sunlight-activated self-healing polymers with unprecedented photoaging resistance  

作　　者：Yan Mei Li Ze Ping Zhang Min Zhi Rong Ming Qiu Zhang 

机构地区：[1]Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education,GD HPPC Laboratory,IGCME,School of Chemistry,Sun Yat-Sen University,Guangzhou,China [2]Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory,Jieyang,China

出　　处：《SusMat》2024年第6期14-25,共12页可持续发展材料(英文)

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:52033011,52373095,52173092;Natural Science Foundation of Guangdong Province,China,Grant/Award Numbers:2019B1515120038,2021A1515010417;GBRCE for Functional Molecular Engineering;Fundamental Research Funds for the Central Universities,Sun Yat-Sen University,Grant/Award Number:23yxqntd002。

摘　　要：Sunlight-triggered self-healing of polymers has attractive advantages,but the same illumination inevitably causes photoaging.The resulting properties deterioration and shortened lifespan run counter to the desire for self-healing.Herein,the authors propose an innovative solution by introducing carbazolylbased dithiocarbamate units.The proof-of-concept crosslinked poly(carbazolyl dithiocarbamates-urethane)shows that the multitasking reactivities of the dynamic bonds stimulated by the sun’s ultraviolet rays concurrently implement self-healing and improve the photoaging resistance.As reflected by the xenon weatherometer measurements,it retains 73.5%of the original strength after 576 h owing to the effects of hydroperoxide intermediates elimination and fluorescence emission.The anti-photoaging ability is far superior to the control filled with commercial stabilizer.Meantime,networks rearrangement via dynamic exchange reactions among the sunlight-sensitive dithiocarbamates and longrange free radicals transfer are allowed in surface layer and the interior,so that the cracks up to 8.5 mm deep are repaired.The work provides a feasible way to break the bottleneck in application of photochemical self-healing polymers.

关 键 词：anti-photoaging dithiocarbamate bond photo-reversible sunlight-stimulated self-healing ultra-deep healing capability 

分 类 号：O63[理学—高分子化学]