According to the experimental results, the phase transition temperature of polyethylene glycol polylactic acid thermosensitive hydrogel can be controlled at 38.5 ~ 40℃, which can better retain water, and the hydrogel loses more than 60% water within 20min minutes above the phase transition temperature.

Thermosensitive hydrogel is a block copolymer of poly (N- isopropylacrylamide) and polyethylene glycol, which is liquid at low temperature and coagulates at high temperature, and the change of this state is reversible with temperature. At the same time, it has many characteristics of polymer materials such as network structure and high water content, and is widely used in many fields such as medicine and life science.