Preparation and Properties of Cellulose/Polyvinyl Alcohol/Polyaniline Flame Retardant Aerogel Sensor
In order to prepare a new composite material with good flame retardant and sensing properties,the hydrogel made of polyvinyl alcohol(PVA)and microcrystalline cellulose(MCC)was used as substrate(MP),and the cellulose/polyvinyl alcohol/polyaniline aerogel(MPP)was prepared by in-situ polymerization method.Then,the structural characteristics,flame retardancy and sensing properties of aerogel were analyzed comprehensively.The results show that the adhesion of polyaniline to the surface and void of the aerogel gives the aerogel a good conductivity of 0.34 S/m,which is about 4 orders of magnitude higher than that of MP.At the same time,with the addition of polyaniline,the internal structure of the aerogel is more dense,and MPP1.25 can withstand the tensile deformation of 1.7 MPa.More importantly,MPP1.2<has a good flame retardant effect,the limiting oxygen index is as high as 29.2％,and the heat release rate and total heat release rate are reduced by 250％and 14％compared with MP,respectively.Finally,due to the porous morphology of MPP125,the aerogel has good sensing performance,which can not only monitor the movement of human finger joints,but also feedback different electrical signals according to different weights,indicating that MPPi25 aerogel has long-term development potential in wearable sensors.
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