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Title: The phase dependent photophysics and photochemistry of side-chain substituted liquid crystalline polyaryl cinnamates

Abstract

The photochemical behavior of a polymethacrylate polymer with a side-chain cinnamate ester mesogen has been investigated. Photolysis at 313 nm of the polymer film in the smectic A or smectic B phase results in only a 2+2 cycloaddition reaction at low photolysis times. In contrast, photolysis (313 nm) of the polymer film in the nematic phase yields both 2+2 cycloaddition and photo-Fries products at short photolysis times. The preference for 2+2 cyloaddition product formation in the smectic phases is attributed to preferential reaction of cinnamate ester aggregates. Accordingly, photolysis at 366 nm where only aggregates absorb yields exclusively cycloadducts even after exhaustive photolysis for long time periods.

Authors:
; ;  [1]
  1. Univ. of Southern Mississippi, Hattiesburg, MS (United States)
Publication Date:
OSTI Identifier:
141671
Report Number(s):
CONF-930304-
TRN: 93:003688-1352
Resource Type:
Conference
Resource Relation:
Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 36 MATERIALS SCIENCE; LIQUID CRYSTALS; PHOTOLYSIS; CRYSTAL-PHASE TRANSFORMATIONS; CINNAMIC ACID; POLYMERIZATION; METHACRYLATES; PHOTOCHEMISTRY; ARYL RADICALS; CHEMICAL REACTION YIELD

Citation Formats

Singh, S, Creed, D, and Hoyle, C E. The phase dependent photophysics and photochemistry of side-chain substituted liquid crystalline polyaryl cinnamates. United States: N. p., 1993. Web.
Singh, S, Creed, D, & Hoyle, C E. The phase dependent photophysics and photochemistry of side-chain substituted liquid crystalline polyaryl cinnamates. United States.
Singh, S, Creed, D, and Hoyle, C E. 1993. "The phase dependent photophysics and photochemistry of side-chain substituted liquid crystalline polyaryl cinnamates". United States.
@article{osti_141671,
title = {The phase dependent photophysics and photochemistry of side-chain substituted liquid crystalline polyaryl cinnamates},
author = {Singh, S and Creed, D and Hoyle, C E},
abstractNote = {The photochemical behavior of a polymethacrylate polymer with a side-chain cinnamate ester mesogen has been investigated. Photolysis at 313 nm of the polymer film in the smectic A or smectic B phase results in only a 2+2 cycloaddition reaction at low photolysis times. In contrast, photolysis (313 nm) of the polymer film in the nematic phase yields both 2+2 cycloaddition and photo-Fries products at short photolysis times. The preference for 2+2 cyloaddition product formation in the smectic phases is attributed to preferential reaction of cinnamate ester aggregates. Accordingly, photolysis at 366 nm where only aggregates absorb yields exclusively cycloadducts even after exhaustive photolysis for long time periods.},
doi = {},
url = {https://www.osti.gov/biblio/141671}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 31 00:00:00 EST 1993},
month = {Fri Dec 31 00:00:00 EST 1993}
}

Conference:
Other availability
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