Abstract
Poly(N-isopropylacrylamide) prepared by free radical polymerization was successfully fractionated into several fractions by using a carefully water-freed acetone as solvent and n-hexane as non-solvent. Based on the viscometric and osmometric studies of these fractions, the intrinsic viscosity-molecular weight relationships were determined as: [η]=9.59 ×10-3 Mn0.65 (in tetrahydrofuran at 27°C)and [η]=14.5 ×10-2 Mn0.50 (in aqueous solution at 20°C)These relationships imply that the statistical segment of poly(N-isopropylacrylamide) takes a considerably extended form in water than it does in tetrahydrofuran. It was also found that the aqueous solution exhibited an abnormal concentration dependence of viscosity at temperatures higher than 25°C and the phase separation at 30°C.
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Fujishige, S. Intrinsic Viscosity-Molecular Weight Relationships for Poly(N-isopropylacrylamide) Solutions. Polym J 19, 297–300 (1987). https://doi.org/10.1295/polymj.19.297
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DOI: https://doi.org/10.1295/polymj.19.297
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