SPG 막유화 및 UV 광중합법에 의해 제조된 PNIPAAm 하이드로젤 입자의 형태학에 관한 연구

Abstract

Abstract: W/O emulsions were prepared from the aqueous solution containing NIPAAm, MBA, and APS in the continuous phase of toluene and mineral oil mixture with HMP and Span80 by using SPG membrane emul-sification, and followed by the formation of PNIPAAm hydrogel microspheres through UV photopolymerization. As the ratio of mineral oil to toluene increased in the continuous phase, both particle size of the hydrogel in-creased and density of PNIPAAm polymer in the hydrogel particle increased, and which significantly affected swelling/deswelling ratio (V/V o ) with temperature change around VPTT. When the polymerization temperature was below LCST (20°C), PNIPAAm hydrogel showed filled particle morphology; however, it was turned out to hollow particle morphology with thick shell layer with 40°C. Both density of PNIPAAm and gel content of the hydrogel increased with the increase in MBA concentration. Keywords: SPG membrane emulsification, hydrogel, PNIPAAm, LCST 1. 서 론 1) 균일한 입도를 가지는 고분자 입자의 제조방법으로는 분산중합(dispersion polymerization) 및 무유화 에멀젼중합(soap-free emulsion polymerization) 등이 널리 알려져 있으나, 5 µm 이상의 균일한 입도를 가지는 고