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In the case of P4A, physical gelation was not observed under similar conditions to those at PPA gelation.

The temperature sensitive behavior and the phase behavior of linear poly(N-isopropylacrylamide) (PNIPA) in water-additive systems were investigated via turbidity measurements..

Three kinds of additives, including acrylic acid (AA), acryl amide (AM) and N-vinyl-2-pyrrolidone (VP), were selected.

AM and VP systems only exhibited a different lower critical solution temperatures (LCST) behavior with different additive concentrations, and in low concentration of AM or VP, LCST decreases with additive concentration increasing, but in higher concentration, LCST decreases with additive concentration increasing. The turbidity and viscosity of a PPA solution depended on temperature and concentration of the polymer and salt added.

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