Effect of modified ZnO nanoparticles with biosafe molecule on the morphology and physiochemical properties of novel polycaprolactone nanocomposites

We prepared nanocomposites (NCs) based on polycaprolactone (PCL) and poly(vinyl alcohol)-modified ZnO, using ultrasound irradiation. First, the surface modification of nanoparticles (NPs) was accomplished, in order to increase the compatibility and dispersity in the polymer matrix. Then PCL composite films containing different amounts of modified NPs were achieved through solvent casting method using dichloromethane as solvent. Transmission electron microscopy images verified the presence of NPs in the polymer matrix. The films were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and ultraviolet-visible absorption spectra. The nature of interaction between PCL and the NPs was determined by Fourier transform infrared spectroscopy. Tensile tests for the prepared films with different NP loadings showed that tensile strength of the NCs have been significantly improved compared with pure PCL. (C) 2016 Elsevier Ltd. All rights reserved.