Figure 2. The thermogelling behavior assay and rheological analysis of the obtained.

PDLLA-PEG-PDLLA hydrogel. (A) Photographs of the copolymer solutions at different temperatures. Copolymer L₁₀₀₀–E₁₀₀₀–L₁₀₀₀ (S1, 25 wt%) gelates between 4 °C and room temperature, and precipitated around 37 °C. Copolymer L₁₅₀₀–E₁₅₀₀–L₁₅₀₀ (S3, 25 wt%) exhibited a sol at 4 °C and room temperature, and gelated around body temperature. (B) Sol–gel phase transition diagram of the hydrogel tested by the tube-inverting method. (C) Temperature-dependence of storage (G’) and loss modulus (G”) for the copolymer aqueous solution (S3, 25 wt%) as a function of temperature. (D) Gelation times of the copolymer solutions (S3, 25 wt%) at 37 °C. (E) Change in G’ of the copolymer solutions at different concentrations (S3, 15 wt%, 20 wt%, 25 wt%) as a function of temperature.