A study on the concentration dependence of excimer formation in pyrenyl labelled polystyrene solutions

Abstract

The fluorescence of pyrenyl labelled polystyrene has been investigated. The ratio of excimer to monomer intensities (Ie/Im) is found to vary tortuously with increasing concentration (C) and displays two critical concentration points, C+ at about 3.2 × 10−2 g ml−1 and Cm at about 0.32 g ml−1. In the region C+ < C < Cm, an abrupt increase of Ie/Im is revealed because of intermolecular interaction. At C > Cm, the sharp decrease of Ie/Im is ascribed to entanglements of polymer chains. © 1999 Society of Chemical Industry

Excimer formation in uniaxially stretched polymer films

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Preparation, Characterization, and Crystallization of Naphthalene-Labeled Polypropylene

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