J. Phys. II France
Volume 3, Numéro 1, January 1993
|Page(s)||69 - 89|
J. Phys. II France 3 (1993) 69-89
Nematic polymers: hairpins, ringlets and excimer fluorescenceD.R.M. Williams and A. Halperin
Department of Materials, University of California, Santa Barbara, CA 93106, U.S.A.
(Received 3 July 1992, revised 12 October 1992, accepted 19 October 1992)
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