Carboxymethylcelloluse- oleic acid based emulsified nanocomposites containing particle: study of microstructure and physical properties-nano2TiO

In this study, emulsified nanocomposite films based on carboxymethyl cellulose (CMC) - titanium dioxide (TiO2) (rutile phase) were made by casting method. In order to investigate the resulting films characteristics, different tests including X-ray diffraction (XRD) analysis, water vapor permeability (WVP), Atomic force microscopy (AFM), UV-VIS transmittance spectra and differential scanning calorimetry (DSC)were performed. TiO2 nanoparticles, as a filler, were added to the CMC –oleic acid emulsion at different concentrations (0.5, 1, 2% w/w) after homogenization by an ultrasonic device. Study of nanocomposite structure by XRD test showed that nanofiller have been homogeneously dispersed in the biopolymer matrix .The WVPsof the films were reduced significantly from 7.15×10 -8 g/m.h.Pa in the control sampleto 6.09×10 -8 g/m.h.Pa in the films containing2% nanoparticle. Topography images obtained from AFM showed that addition of TiO2nanoparticles increased the roughness of CMC based films. The ultraviolet and visible radiation transmittance values in the nanocomposite containing 2% TiO2 nanoparticles were 15.13% and 30.58%, respectively, i.e., 85% of UV radiation and 70% of VIS radiation were absorbed or scattered. DSC test showed that, the glass transition temperature increased from 86.65 ˚C in the control film to 81.4 ˚C in the film containing 2% nanoparticle.