J. Phys. II France
Volume 3, Number 1, January 1993
Page(s) 69 - 89
DOI: 10.1051/jp2:1993112
J. Phys. II France 3 (1993) 69-89

Nematic polymers: hairpins, ringlets and excimer fluorescence

D.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

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