| Numéro |
J. Phys. II France
Volume 3, Numéro 1, January 1993
|
|
|---|---|---|
| Page(s) | 69 - 89 | |
| DOI | https://doi.org/10.1051/jp2:1993112 | |
DOI: 10.1051/jp2:1993112
J. Phys. II France 3 (1993) 69-89
Department of Materials, University of California, Santa Barbara, CA 93106, U.S.A.
36.21c - 61.30B - 82.35
© Les Editions de Physique 1993
J. Phys. II France 3 (1993) 69-89
Nematic polymers: hairpins, ringlets and excimer fluorescence
D.R.M. Williams and A. HalperinDepartment of Materials, University of California, Santa Barbara, CA 93106, U.S.A.
(Received 3 July 1992, revised 12 October 1992, accepted 19 October 1992)
Abstract
Short liquid crystalline polymers in a nematic environment are very unlikely to cyclise. Hairpins, abrupt chain folds, favour
cyclisation. As a result the cyclisation rate constant exhibits a maximum as a function of chain length. The maximum corresponds
to a new object, a "ringlet". The rate constant also depends exponentially on temperature. This suggests excimer fluorescence
as a probe of configurations and dynamics of main-chain liquid crystalline polymers.
36.21c - 61.30B - 82.35
© Les Editions de Physique 1993