스프레이 건조법을 이용한 PMMA/TiO2 다공성 입자 제조 및 특성 연구

Highly porous polymethyl methacrylate (PMMA) microspheres impregnated by TiO2 powder were prepared by spray drying method. The particle size and the porosity were controlled by optimizing the co-solvent ratio and the polymer concentration. TiO2 powder was impregnated into the microspheres upto 74.6 wt% content based on the weight of the resultant PMMA/TiO2 microspheres. SEM images showed that TiO2 powder was well distributed throughout the inside of the microsphere. EDX mapping showed that the Ti signal was well detected from every part of the microspheres, which was the evidence of the formation of the PMMA/TiO2 composite. Hg porosimetry result showed that the porosity was found to be over 50% regardless of the TiO2 contents. The final product was found to have high oil-absorbing capacity and great hiding power, both of which are key properties in designing the microsphere materials for make-up cosmetics application.