Abstract
The hydrophobicity and dynamic characteristics of cross-linked polystyrene gels with quaternary ammonium groups (PSQA) have been studied from the fluorescence spectra and depolarization of 6-p-toluidino-2-naphthalenesulfonate (TNS) and 5-dimethylamino-1-naphthalenesulfonate (DNS) in an aqueous dispersion of the ground PSQA samples. The positions of fluorescence maxima (λf max) for both TNS and DNS are markedly shifted to the shorter wavelengths with increasing divinylbenzene content (x) in PSQA. This shows an increase in the hydrophobicity of microenvironment around cationic sites in PSQA. The blue shift in λf max of TNS and DNS in PSQA corresponds well to the observed marked increase in catalytic activity of PSQA for the decarboxylation of 6-nitrobenzisoxazole-3-carboxylate anion. The emission anisotropy, r, reflecting the immobility of TNS ionically bound to PSQA gradually increases with increasing x in PSQA, while r for DNS ionically and covalently bound to PSQA rapidly increases up to x=8% and then levels off for a further increase in x. Almost free penetration of small molecules can be supposed only for PSQA with 2% divinylbenzene. Non-stationary-state measurements of emission anisotropy gave rotational relaxation times ρ in the range of 50—130 ns for the probes in cross-linked polystyrene beads.
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Horie, K., Mita, I., Kawabata, J. et al. Hydrophobicity and Dynamic Characteristics of Cross-Linked Polystyrene Gels Studied with Fluorescent Probes. Polym J 12, 319–328 (1980). https://doi.org/10.1295/polymj.12.319
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DOI: https://doi.org/10.1295/polymj.12.319
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