An observation on excimer formation in pyrenyl-labelled polystyrene: concentrated solution and solvent-plasticized film

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

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 59 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199908)48:8<630::aid-pi242>3.0.co;2-r

✦ Synopsis

Excimer formation of pyrenyl labels attached to polystyrene has been studied in concentrated solution and solvent-plasticized ®lm. The ratio of excimer to monomer intensities (I e / I m ) is found to vary tortuously with increasing concentration (C) and display a critical concentration point at C g % 0.80 g ml À1 . While C `Cg , the sharp decrease of I e /I m is ascribed to entanglements of polymer chains. In the region C b C g , I e /I m increases slowly because of static excimer formation.