Figure 2

(A) ¹H NMR specturm of the PLGA-PEG-PLGA copolymer, (B). GPC analysis of the copolymer shows a unimodal distribution, (C) the sol-gel transition process of the copolymer-saline solution (transition temperature of 35 °C), (D) the apperance of copolymer-saline solution at different temperatures.