Abstract
The fluorescence spectra and fluorescence quenching of a pyrene-labelled poly(vinylsulphobetaine) were measured in the presence of various salts. The extent of excimer fluorescence was found to be only slightly affected by the solubility behaviour of these types of zwitterionic polymers. However, the fluorescence quenching experiments clearly demonstrate the interactions between anions and poly(vinylsulphobetaines) in the solubilization process of these polymers in aqueous salt solutions. Further support for these interactions is provided by the observation of a CT band for the poly(vinylsulphobetaine) derived from 4-vinylpyridine in an aqueous 0.05 M NaI solution. The fluorescence quenching experiments did not provide additional evidence for interactions between cations and poly(vinylsulphobetaines).
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