Optimal Preparation and Characterization of Poly(urea–formaldehyde) Microcapsules

摘要

Microcapsules with epoxy curing agent were successfully prepared by an in-situ polymerization route with epoxy resin and poly-(urea–formaldehyde) as core and shell materials, respectively. The synthetic conditions were optimized by a comprehensive investigation on raw materials consumption, size distribution, and surface morphology. Preparation of microcapsules with high wrap ratio was also demonstrated. The as-synthesized microcapsules were studied using various characterizations techniques, including optical microscope, fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and contact angle meter. Spherical microcapsules (size: 60 lm) with smooth surface were obtained when the stirring rate was 400 rpm and the amount of core materials is 76 wt %.