The phase dependent photophysics and photochemistry of side-chain substituted liquid crystalline polyaryl cinnamates
- Univ. of Southern Mississippi, Hattiesburg, MS (United States)
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.
- OSTI ID:
- 141671
- Report Number(s):
- CONF-930304-; TRN: 93:003688-1352
- 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
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