We proposed a novel approach to prepare high-performance continuous regenerated keratin fibers with wool-like structure by using the cortical cells and linear keratin from wool waste as reinforcement and adhesive,resp...We proposed a novel approach to prepare high-performance continuous regenerated keratin fibers with wool-like structure by using the cortical cells and linear keratin from wool waste as reinforcement and adhesive,respectively.The spindle-shaped cortical cells were taken from wool waste based on the different responses of cortical cells and mesenchyme in wool to the treatments of H_(2)O_(2) oxidation and ultrasonication.The linear keratin was yielded through dissolving wool waste in the green solution consisting of starch derived dithiothreitol and protein denaturant sodium dodecyl sulfate.The recycled keratin fibers were produced by wet-spinning of the mixture solution comprising of cortical cells,linear keratin and toughener poly(ethylene glycol)diacrylate,and crosslinked by glutaraldehyde and 4,4′-methylenebis-(phenyl isocyanate).The cortical cells were aligned along the regenerated fibers axis and retained quite a fewα-helical crystals of the intermediate filaments,benefitting improvement of mechanical properties.Consequently,the valuable chemical compositions and hierarchical microstructures of wool were largely inherited.Their mechanical properties,thermal stability,dyeing property,moisture absorption capability,and antistatic resistance resembled those of wool.The regenerated fibers contained 93.3 wt.%components of wool,and the amount of synthetic chemicals in the regenerated fibers was controlled to as low as 6.7 wt.%.展开更多
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 ...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.展开更多
基金National Natural Science Foundation of China,Grant/Award Numbers:52033011,51773229,51873235,51973237Natural Science Foundation of Guangdong Province,Grant/Award Numbers:2019B1515120038,2021A1515010417,2020A1515011276+1 种基金Science and Technology Planning Project of Guangdong Province,Grant/Award Number:2020B010179001Industry-University-Research Collaboration Project of Zhuhai City,Grant/Award Number:ZH22017001200004PWC。
文摘We proposed a novel approach to prepare high-performance continuous regenerated keratin fibers with wool-like structure by using the cortical cells and linear keratin from wool waste as reinforcement and adhesive,respectively.The spindle-shaped cortical cells were taken from wool waste based on the different responses of cortical cells and mesenchyme in wool to the treatments of H_(2)O_(2) oxidation and ultrasonication.The linear keratin was yielded through dissolving wool waste in the green solution consisting of starch derived dithiothreitol and protein denaturant sodium dodecyl sulfate.The recycled keratin fibers were produced by wet-spinning of the mixture solution comprising of cortical cells,linear keratin and toughener poly(ethylene glycol)diacrylate,and crosslinked by glutaraldehyde and 4,4′-methylenebis-(phenyl isocyanate).The cortical cells were aligned along the regenerated fibers axis and retained quite a fewα-helical crystals of the intermediate filaments,benefitting improvement of mechanical properties.Consequently,the valuable chemical compositions and hierarchical microstructures of wool were largely inherited.Their mechanical properties,thermal stability,dyeing property,moisture absorption capability,and antistatic resistance resembled those of wool.The regenerated fibers contained 93.3 wt.%components of wool,and the amount of synthetic chemicals in the regenerated fibers was controlled to as low as 6.7 wt.%.
基金National Natural Science Foundation of China,Grant/Award Numbers:52033011,52373095,52173092Natural Science Foundation of Guangdong Province,China,Grant/Award Numbers:2019B1515120038,2021A1515010417+1 种基金GBRCE for Functional Molecular EngineeringFundamental Research Funds for the Central Universities,Sun Yat-Sen University,Grant/Award Number:23yxqntd002。
文摘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.
