Preparation And Characterization Of Nano-Cellulose Fiber/MUF Composites And Its Energy Storage Materials

With the high-speed development of economy,the study of nano biomass materials as fillers to modify polymer composite,had become more and more attention by the researchers both at home and abroad.And NCF not only keep all the characteristics of the cellulose,and at the same time have many advantages of nanomaterials,using NCF as strengthening phase,the preparation of a new type of composite material has become one of hotspots in the field of the contemporary study of cellulose.The paper takes NCF/MUFcomopsite as the research object,using unmodified NCF,KH550 modified NCF,carboxymethylated modification NCF as enhancement phase,to prepare comopsite materials by physical blending method,and also using MUF resin modified NCF as well material,as phase change materials as the core,to prepare nanocapsulated phase change materials by in-situ polymerization.the thermal stability,mechanical properties,interface compatibility,and energy storage performance were characterized with Fourier Transform(FT-IR),differential scanning calorimetry(DSC)and dynamic mechanical analysis(DMA),field emission electron microcopy(FE-SEM),thermogravimetric analyzer(TGA)and X-ray diffraction(XRD).The following results werer obtained:?FT-IR spectra showed that KH550 modification,carboxymethylated modification had effect on the NCF,they are effectively grafted or coated to the surface of NCF.Two methods have reduced the polarity and hydrophilicity of NCF,the interfacial compatibility of NCFand MUF resin was improved.?The initial decomposition temperature of NCF modified MUF resin was decreased,and the residual weight were increased with increasing weight content of NCF.The curing reaction enthalpy of the compostites were increased.?Storage modulus of NCF modified MUF resin were increased with increasing weight content of NCF.The most obvious increasing storage modulus of composite was the KH550 modifed NCF/MUF resin compostie.?Bonding strength thest results show that the adding amount of NCF had remarkable effect on the bond strength of MUF resin suppuresion poplar plywood,especially KH550 modifed NCF.After curing NCF/MUF adhesive's pore and surface drape were decreased significantly,which weas beneficialc to form dense rubber.?After NCF modification,the initial decomposition temperature of phase change materials is slightly increased,the phase transition enthalpy and mechanical strength of phase change materials were also improved.When adding 1.5wt% NCF,NCF can be dispersed evently in the wall materials of microcapsule,the phase change enthalpy of MUF storage materials was 61.20J/g,which microcapsule package content was increased from 50.1% to 50.1%,breakage rate was decreased from 30.2% to 24.5%.