Synthesis of Polyurethane Microgel Containing PEG by Solution Polymerization

용액중합에 의한 PEG 함유 Polyurethane Microgel의 합성

Poly(ethylene glycol) (PEG), isophoron diisocyanate (IPDI), and 1,1,1-tris(hydroxymethyl)propane (THMP) were used to synthesize polyurethane microgel. The formulation to form a microgel was determined, and the shape and the properties of the microgel were characterized with SEM and particle size analyzer. The microgel was only formed when PEG was used more than THMP exceedingly. Therefore, it is believed that PEG plays an important role in the synthesis of the microgel. During the formation of the microgel, the viscosity of the microgel solution was decreased. Molecular weights of the PEGs which were used in this research were 2,000, 6,000, and 10,000. The microgel synthesized with PEG 6000 showed the best property in comparison with others. The size of the microgel measured by particle size analyzer were about 130~230 nm.

본 연구에서는 poly(ethylene glycol) (PEG), isophoron diisocyanate (IPDI), 1,1,1-tris(hydroxymethyl)propane (THMP) 등을 사용하여 polyurethane microgel을 합성하였다. Microgel이 형성될 수 있는 조건들을 측정하였으며, 전자현미경 (SEM), 입자크기 측정기 등을 이용하여 형성된 microgel의 형태 및 물성들을 알아보았다. 사용한 PEG의 양이 THMP에 비해 비교적 많을 때에만 microgel이 형성되었으며, 따라서 PEG가 microgel의 형성에 매우 중요한 역할을 하고 있음을 알 수 있었다. Microgel의 형성 과정 중에 측정한 microgel 용액의 점도는 microgel의 형성과 더불어 감소하였다. 사용한 PEG의 분자량은 2,000, 6,000, 10,000이었는데 분자량이 6,000인 것을 사용하였을 때, microgel이 가장 잘 얻어졌다. 형성된 microgel의 크기를 입자크기 측정기로 측정하였더니 130~230 nm 정도였다.