| Publication Type |
Journal Article |
| Title |
Coil-globule transition of pyrene-labeled polystyrene in cyclohexane: Determination of polymer chain radii by fluorescence |
| Authors |
Susana Gonçalves J Duhamel Alexander Fedorov J. M. G. Martinho |
| Groups |
|
| Journal |
JOURNAL OF PHYSICAL CHEMISTRY B |
| Year |
2004 |
| Month |
August |
| Volume |
108 |
| Number |
32 |
| Pages |
12009-12015 |
| Abstract |
The coil-globule transition of a polystyrene chain (M-w = 113 000, M-w/M-n = 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 degreesC 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 degreesC 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. |
| DOI |
http://dx.doi.org/10.1021/jp048616o |
| ISBN |
|
| Publisher |
|
| Book Title |
|
| ISSN |
1520-6106 |
| EISSN |
|
| Conference Name |
|
| Bibtex ID |
ISI:000223182900021 |
| Observations |
|
