Abstract
The fluorescence spectra of the tert-butyl ester of 9-anthroic acid (9TBA) in two PVA (poly(vinyl alcohol)) polymer matrices of different molecular weights are different and indicate media of different rigidity. 9TBA also undergoes different edge excitation red-shifts in these PVA polymer matrices and is attributed to a decrease in the free volume in the higher molecular weight matrix. Comparison of the red edge effect (REE) observed for 9TBA in PVA (molecular weight 88000) polymer matrix with the REE observed in polymethylmethacrylate (PMMA) and in poly(hydroxyethyl methacrylate) (PHEMA) polymer matrices is used to establish that the free volume in PVA (88000) is smaller than in PHEMA or PMMA.
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