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Thermogelation behaviors of aqueous polymer solutions with or without the macromolecular contrast agent PI. (A) Photographs showing sol (25 °C) and gel (37 °C) states of the various aqueous polymer solutions. (B) Storage modulus G′ and loss modulus G″ of the aqueous polymer solutions containing PI as a function of temperature. PI1 means the 1/1 (w/w) mixture of PI and P1, and the same is for PI2 and PI3.
