| Interactive sensor is a kind of intelligent sensor which feeds back the perceived external stimulus information to the user.it has a wide application prospect in the fields of human health monitoring,cell motion monitoring,and human-computer interaction.The photonic crystal is introduced into the interactive sensor to endow the interactive sensor with the visualization function of the interactive sensor.the visual sensor based on photonic crystal has the advantages of bright color,rich color,quantitative feedback of stimulus signal,and so on.At present,the photonic crystal-based visual sensor is based on soft materials such as hydrogel,which has some problems,such as poor environmental stability,weak mechanical properties,loss of function caused by external force damage,and so on.In order to solve the above problems,this paper introduces dynamic covalent bond elastomers to improve the mechanical properties and self-repair properties of soft materials and introduces them into three-dimensional photonic crystals to give dynamic covalent bond elastomers excellent optical response function.The photonic elastomer based on dynamic covalent bond network can be used as an ideal optical functional material for visual interactive sensor,and then it can be applied to the field of interactive sensing,such as human motion detection.The specific work is as follows:Firstly,using hydroxyl-terminated polybutadiene(HTPB),poly(1-butanediol 4-butanediol)(PTMG),glycerol(GLY),and isophorone diisocyanate(IPDI)as raw materials,Polycondensation was carried out under the catalysis of dibutyltin dilaurate(DBTDL),and the elastic material(HPGI)based on dynamic carbamate bond with good mechanical properties and self-repairing ability was prepared.The maximum elongation at break of HPGI elastomer is 5500%,and the self-healing efficiency of maximum strength 4 Mpa,is close to 100%.The photonic elastomer material with the mechanochromic property was obtained by introducing HPGI into the photonic crystal,and then compounded with conductive carbon nanotube(CNTs),a visual interactive sensor with optical/electrical dual response was constructed.It has good optical/electrical response characteristics,anti-fatigue,and creeps resistance,and functional self-repairing properties.The visual interactive sensor with optical/electrical dual response is applied to human joint detection.With the motion of the joint,the color of the sensor is blueshifted,the electrical signal changes regularly,and has a good visual interaction ability.In particular,the dynamic carbamate bond in HPGI makes the sensor have a good shape and function self-repair ability.After the sensor is damaged,the sensor still has good visual interaction ability after thermal repair.Secondly,using HTPB,IPDI,bis(2-hydroxyethyl)disulfide(SS),and trimethylolpropane tris(3-mercapto propionate))(SH)as precursors,Polycondensation was carried out under the catalysis of DBTDL to prepare a new elastic material based on dynamic disulfide bond-HISS,which has better self-repairing properties.Compared with HPGI elastomers,the self-healing time of HISS is nearly 60 times shorter at the same temperature.Then a new mechanochromic material was prepared by combining HISS elastomer with photonic crystal,and a layer of carbon nanotubes was sprayed on its surface to form a cracked photonic crystal elastic material and introduce into the conductive substrate,thus a kind of visual interactive sensor with optical/electrical double response was fabricated.When it is applied to the tracking and monitoring of human joint motion,it still has a good visual sensing ability of dual-learning /electrical double-response even after injury self-repaired. |
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