Microencapsulation of a Palm Oil-based Alkyd by Amino Resins

摘要

Preparation of microcapsules of poly(urea-formaldehyde) (PUF) and melamine-modified PUF (PUMF) shells that encapsulated a core of palm oil-based alkyd resin was described. Ethylene maleic anhydride (EMA) was used as emulsifier. The effects of core-shell weight ratio on microcapsules size and surface morphology were studied. The microcapsules obtained were inspected using digital microscope and field emission scanning electron microscope (FESEM) to study the formation of microcapsules and their surface morphology. The core and shell content was verified using differential scanning calorimetry (DSC) and attentuated total refiectance fourier-transformed infrared (ATR-FTIR). Thermogravimetric analysis (TGA) shown that the microcapsules have different degradation rates of core and shell thus reconfirmed the formation of microcapsules. The resultant microcapsules appear as white-yellowish and free-fiowing spherical particles, having a rough, non-porous shell which was formed by PUF and PUMF nanoparticles. The microcapsules have their diameters ranging from 150-500 microns, and they contain 87-90% of the alkyd as core and 10-13% of shell by weight.