Preparation And Characterization Of Microcrystalline/Natural Latex Composites Film

In this paper,microcrystalline cellulose(MCC)is prepared as a reinforcing filler material for natural rubber latex(NRL)using straw powder,while MCC/NRL composite latex film is prepared via emulsion blending.In this way,the influences of varied filler types and MCC amount on the curability of the composite film,the mechanical property of the curing latex film,the aging property,solvent resistance,and cross-section microstructure can be investigated.Based on this,the dispersion of the composite filler and its reinforcing effect on natural latex are discussed through preparing MCC/ graphene oxide(GO)composite fillers and MCC /GO /NRL ternary composites.The first part focuses on MCC preparation.MCC is prepared from straw powder with mechanical treatment and chemical hydrolysis and characterized by characterization techniques such as PSD,SEM,XRD,and FTIR as well as polymerization test(viscometric method).According to the results,MCC has a superior length-diameter ratio(LDR),larger specific surface area,and better diversion in water with rod-like or short-fiber particle microstructure in comparison to straw powder.What's more,it displays increased surface roughness,enhanced crystallinity,improved thermal stability,and cellulose-I crystal form.The second part presents the preparation and characterization of MCC/ NRL latex film.MCC/NRL blended emulsion is prepared via emulsion blending,while the composite latex film and curing latex film are prepared by molding and hot air curing.On this basis,the influences of varied filler types and MCC amount on the curability of the composite film,the mechanical property of the curing latex film,the aging property,solvent resistance and cross-section microstructure can be studied.The findings show that hardness and crosslinking density of the composite latex film are increased with the decrease of mobility.Different filler types and MCC amount can improve the mechanical property of the cured latex film.And the tensile strength,elongation at break and 300% stress at a definite elongation of the cured latex film are firstly increased and then decreased as the MCC amount increases.It is worth noting that the superior mechanical property can be witnessed in the cured latex film when the MCC amount is nine-tenths portions.And in the last part,the dispersion of MCC/GO composite fillers is observed before the preparation of MCC/GO/NRL ternary composite materials.Meanwhile,the influences of varied filler types and the amount of MCC/GO composite fillers on the mechanical property of the cured latex film are compared.As it can observe that part of GO slice layers are attached to the 3D space-like network structure of the MCC fiber particle surface,the dispersion of the composite filler is superior to that of the GO single filler.And the tensile strength,elongation at break and stress at a definite elongation of the cured latex film are firstly increased and then decreased as the MCC amount increases.Meanwhile,the optimal mechanical property of the cured latex film can be obtained when 2 portions of composite fillers are added.Moreover,with a decline in gas permeation,the MCC/GO/NRL composite film possesses an improved gas barrier,compactness,and thermal stability,in comparison to the blank sample.