ScienceAsia 23 (1997): 253-258 |doi: 10.2306/scienceasia1513-1874.1997.23.253

EVALUATION OF CMC OF SURF ACT ANTS THROUGH THE UV S-I BANDS OF STYRENE

WEERASAK SOPITKITTIKUL^a, RUANGSRI WATANESK^b AND SURASAK WATANESK

ABSTRACT: The effect of solvents on the ultraviolet spectrum of styrene was studied by considering the absorption ratios (R_pv) at peak and valley of benzenoid bands. These ratios varied with the change of electrical environment that could be monitored through the dielectric constant of the solvent. It was found that the R_pv values of the solvent-induced (s-i) bands of styrene decreased as the polarity of solvent increased. In addition, at higher temperature, those values of R_pv turned out to be lower, especially in polar solvents.

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Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50202, Thailand.

Received 2 June 1997