Synergistic effect of diacid-modified ZnO as nanofiller, for enhancing the properties of polycaprolactone-based nanocomposites

Polycaprolactone (PCL) is a semi-crystalline, hydrophobic, biocompatible and biodegradable polymer that has extensively been used in packaging materials and biomedical applications [1]. However, PCL has some drawbacks including slow crystallization rate and low stiffness that limited its practical application. These drawbacks can be overcome by incorporation of nanofillers such as metal oxide nanoparticles (NPs), which improve the physical properties and extend its practical use [2]. We prepared nanocomposites (NCs) based on polycaprolactone and diacid based on bioactive amino acid (N-trimellitylimido-L-alanine) (DA)modified ZnO, using ultrasound irradiation. First, the surface modification of NPs was accomplished using ultrasound irradiation, in order to increasing the compatibility and dispersity in the polymer matrix. Then PCL composite films containing different amounts of modified NPs were achieved through solvent casting method by the use of dichloromethane as a solvent. Transmission electron microscopy images (Figure 1) verified the presence of NPs in the polymer matrix. The films were characterizedby Fourier transform infrared spectroscopy, X-ray diffraction andthermogravimetricanalysis. The nature of interaction between PCL and the NPs was determined by Fourier transform infrared spectroscopy.