NDLI: Coil−Globule Transition of Pyrene-Labeled Polystyrene in Cyclohexane: Determination of Polymer Chain Radii by Fluorescence

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Coil−Globule Transition of Pyrene-Labeled Polystyrene in Cyclohexane: Determination of Polymer Chain Radii by Fluorescence

Content Provider	Semantic Scholar
Author	Piçarra, Susana Duhamel, Jean Fedorov, Andrei Martinho, J. M. Gaspar
Copyright Year	2004
Abstract	The coil−globule transition of a polystyrene chain (Mw = 113 000, Mw/Mn = 1.03) randomly labeled with a pyrene derivative was studied in cyclohexane under dilute conditions by fluorescence. The coil−globule transition temperature was found to be around 25 °C from the presence of a break point in the pyrene excimer-to-monomer fluorescence intensity ratio plot with temperature. Analysis of the pyrene monomer fluorescence intensity decays with the fluorescence blob model modified to consider the presence of ground-state pyrene pairs allowed for the determination of the chain radii at several temperatures between 12 and 50 °C and confirmed the occurrence of a coil−globule transition. Fluorescence was found to be a reliable technique for studying the coil−globule transitions in dilute solutions of low-molecular-weight polymers where stable globules exist without the interference of polymer aggregates in a large temperature interval.
Starting Page	12009
Ending Page	12015
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1021/jp048616o
Alternate Webpage(s)	https://web.ist.utl.pt/ist10984/PDF/2004/J%20Phys%20Chem%20B%20108_12009-12015_2004.pdf
Alternate Webpage(s)	https://doi.org/10.1021/jp048616o
Volume Number	108
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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