Study on Preparation and Sensitive Properties of Polyethylene Glycol (PEG) / Polyvinyl Alcohol (PVA) Thermo-Sensitive Hydrogel

Thermo-sensitive hydrogel have broad application prospects in biochemistry, medicine and other fields. In this paper, PEG as low melting point polymer was grafted at PVA which was as polymer framework of high melting point by copolymerization, a serials of new reversible phase-change materials were obtained and thermo-sensitive hydrogel were prepared because of their swelling properties. The hydrogel swelling behavior was analyzed, thermo-sensitive properties analysis was made by using DSC method, xerogel phase transition behavior was also studied and through which the relationship between PEG phase transition temperature and thermo-sensitive behaviors of the hydrogel was studied. The results showed that the thermo-sensitive hydrogel phase transition temperature was in the range of 36.3~43°C,and the phase transition temperature and the temperature sensitivity existed a certain relationship.