Abstract
Fluorescence and viscosity of dilute solution of poly(4-hydroxystyrene) (PHS) were measured in methanol in the temperature range 5 to 55°C. The fluorescence spectrum of PHS showed two emission bands at around 308 nm and 356 nm, corresponding to the monomer and the excimer bands, respectively. From the temperature-dependent fluorescence measurements, a plot of the excimer to monomer intensity ratio Id/Im versus temperature was obtained, which shows double lines with positive slopes crossing at ca. 35°C. From temperature-dependent viscosity measurements, a plot of the limiting viscosity number [η] versus temperature was obtained, which shows double lines with negative slopes crossing at ca. 40°C, above which the slope was decreased. These results indicate that there is stronger solvation of solvent molecules to polymer coil at temperatures below ca. 35–40°C, arising from hydrogen bond formation between PHS and methanol molecules.
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Himuro, S. Fluorescence and Viscometry Studies of Poly(4-hydroxystyrene) in Solution. Polym J 25, 1223–1228 (1993). https://doi.org/10.1295/polymj.25.1223
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DOI: https://doi.org/10.1295/polymj.25.1223