Micro/nanospheres from polysilsesquioxane containing uva-absorbing group

Abstract

In this research, we prepared polysilsesquioxane micro/nanospheres with UV absorption property through the polymerization process of hybrid monomer, triethoxysilylpropyl-4-methoxycinnamamide and triethoxysilylpropyl-2,4-dimethoxycinnamamide. It was found that the catalysis types and volume of solvent used during the particle formation, affected particle size and product yield. Particle size increased with the increased volume of solvent but the high volume of solvent inversely correlated with product yield. Moreover, polymerization at higher monomer concentration gave a lower yield. Encapsulation of 2-ethylhexyl-4-methoxycinnamate into poly[propyl-4-methoxycinnamamide silsesquioxane], PTES4C and poly[propyl-2,4-dimethoxycinnamamide silsesquioxane], PTES24C spherical particles could be carried out successfully at 61.54% encapsulation efficiency (20.86% loading) and 31.87% encapsulation efficiency (10.17% loading), respectively.