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

✍ Scribed by Li, Xinsong; Wang, Guochang; He, Binlin

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
58 KB
Volume
48
Category
Article
ISSN
0959-8103

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✦ Synopsis

The ¯uorescence of pyrenyl labelled polystyrene has been investigated. The ratio of excimer to monomer intensities (I e /I m ) is found to vary tortuously with increasing concentration (C) and displays two critical concentration points, C at about 3.2 Â 10 À2 g ml À1 and C m at about 0.32 g ml À1 . In the region C C Cm , an abrupt increase of I e /I m is revealed because of intermolecular interaction. At C b C m , the sharp decrease of I e /I m is ascribed to entanglements of polymer chains.

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