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Sol-gel-sol phase transition of PECE hydrogel. A: Sol-gel-sol phase transition diagram. When the concentration was above corresponding critical gel concentration (CGC), the aqueous solution of PECE copolymer undergo a sol-gel-sol transition as the temperature increases.B: Photograph of PECE hydrogel at 10°C (right) and at 37°C (left). At low temperature, the hydrogel is an injectable flowing sol, and forms a non-flowing gel in body temperature.
