| At present,more and more waste materials such as plastic products produced by non-renewable resources have been transferred from land to sea,which poses a huge threat to the environment and human health.It is urgent to manufacture eco-friendly biodegradable alternative materials.Wood can be widely used in various fields due to its good biodegradability,rich resources,large manufacturing scale,and low material costs.Inspired by biological materials and biological intelligent regulation behavior in nature,bionic intelligent driving materials are designed to simulate the special microstructure of natural plant system,which can respond to external stimuli sensitively and produce reversible deformation and movement.Although the traditional intelligent soft drive material design has achieved certain achievements,these soft drives still have disadvantages such as expensive raw materials,strict or complex synthetic technology and equipment,and insufficient response capabilities.Therefore,it is of great strategic significance to develop and design a low-cost,versatile,and easily expandable high-performance drive.This research is inspired by the phenomenon of shell opening and closing caused by moisture change in pines,pods,wheat awns and sesame during the drying process in nature.Combined with the symbiosis of tree trunk and bark,using wood,combining the bionic idea with material preparation technology,combining basic research with application research,realizing the coordination and unification of composition,structure,and function.Through clever structural design,a wood-based intelligent driving material that can sensitively respond to humidity is prepared.Based on this,it was combined with cork and cellulose acetate film respectively to design humidity-driven smart clothes and solvent-driven gas sensor,and the concept of their application is further verified.The results show that:?1?Using poplar veneer as raw material,anisotropic nanocellulose transparent film is obtained by simple soaking,bleaching and cold pressing.The obtained transparent film has excellent properties such as sensitive response(362°·s-1),strong deformation ability??180°?,large mechanical strength?402 Mpa?,high lifting weight ratio??109 times?,good transparency?81.2%?,reversible cycle high performance??10000 times?.A transparent film with a thickness of 30?m is selected and combined with the cork layer to design an intelligent fabric that can respond to humidity sensitively.The intelligent fabric obtained has good thermal and wet comfort and has the effect of intelligent moisture dissipation and heat preservation in hot and cold environment.Moreover,it has high water vapor transmittance(0.02 g·cm-2·h-1),high stress strength?294 Mpa?,excellent pollution resistance and antifouling performance,good mildew resistance,excellent weather resistance and other properties,is an ideal material for smart clothes.?2?The transparent film and the cellulose acetate film are compounded by the method of hot pressing in a wet state to obtain a transparent film/CA composite film that can respond sensitively to the solvent gas.The composite film is sensitive(20.4°·s-1),has large bending deformation??102°?,and can respond to different solvent gases?acetone,ammonia,anhydrous ethanol,N-butanol,isopropanol,cyclohexane?.Based on the excellent performance of transparent film/CA composite film,a gas sensor was designed and constructed,and its concept was verified.The designed gas sensor can respond to the solvent atmosphere in the air sensitively,monitor the ambient gas in real time,and trigger different switches when the solvent concentration is different,so as to achieve the function of ventilation and exhaust the solvent gas in the air and alarm.The above results show that the intelligent fabric with sensitive response to humidity and the intelligent gas sensor with sensitive response to solvent gas designed and constructed in this study are feasible,showing great potential in various applications,and providing reference for the future design and research of more sensitive,green and expansible intelligent materials. |
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