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The polymeric micelle solutions were stored at a low temperature to equilibrate for 30 min before the ultraviolet (UV) measurements (UV-2550, Shimadu, Japan). The experimental temperature range was 25¨C50¡ãC in increments of 2¡ã C. At least 20 min was allowed for the temperature equilibration of the sample. The opaque temperature was determined as the onset point of the abrupt increase in theUV absorption, and the precipitate temperature was determined when the precipitate of the solution was formed. The LCST of the polymer solution was defined as the temperatureproducing a half increase of the total increase in optical absorbance (25).
The sol (flow)¨Cgel (no flow) transition behaviors of the terpolymers in aqueous solution were investigated by the tube tilting method, with a temperature increment of 2¡ãC.
The sol-to-gel transition behaviors of the polymer aqueous solution were further investigated by Bohlin Gemini 200 (Malvern Instuments Ltd., Malvern, U.K.). The polymer aqueous solution was placed between parallel plates with 25 mm  iameter and 0.5 mm of a gap. The data were collected under a controlled stress (4.0 dyn/cm2 ) and a frequency of 1.0 rad/s. The heating rate was 1¡ãC/min.
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