End-to-end cyclization of a pyrene end-capped poly(bisphenol AF-diethylene glycol carbonate) in solution
✍ Scribed by Jean Duhamel; Yariv Khaykin; Yong Zhong Hu; Mitchell A. Winnik; Sylvie Boileau; Françoise Mechin
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 414 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0014-3057
No coin nor oath required. For personal study only.
✦ Synopsis
A~aetiA pyrene end-labelled poly(bisphenol AF-diethylene glycol carbonate) has been synthesized. Its molecular weight and end-group composition were determined through a combination of u.v. absorption and fluorescence decay measurements of the pyrene end-groups. Through gel permeation chromatography, several fractions were collected. For each fraction, the cyclization dynamics of the polymer in dilute solutions in acetone and toluene were investigated through studies of intramolecular fluorescent excimer formation. Values for (k I ), the end-to-end cyclization rate constant, as well as for k_~ and kE were calculated.