Intrinsic response of polymer liquid crystals in photochemical phase transition

Journal Article · Thu Jan 24 04:00:00 EST 1991 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100155a003· OSTI ID:5776539

Ikeda, Tomiki; Sasaki, Takeo; Kim, Haengboo ^[1]

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1. Tokyo Institute of Technology, Yokohama (Japan)

Time-resolved measurements were performed on the photochemically induced isothermal phase transition of polymer liquid crystals (PLC) with mesogenic side chains of phenyl benzoate (PAPB3) and cyanobiphenyl (PACB3) under conditions wherein the photochemical reaction of the doped photoresponsive molecule (4-butyl-4-{prime}-methoxyazobenzene, BMAB) was completed within {approximately} 10 ns, and the subsequent phase transition of the matrix PLC from nematic (N) to isotropic (I) state was followed by time-resolved measurements of the birefringence of the system. Formation of a sufficient amount of the cis isomer of BMAB with a single pulse of a laser lowered the N-I phase transition temperature of the mixture, inducing the N-I phase transition of PLCs isothermally in a time range of {approximately} 200 ms. This time range is comparable to that of low molecular weight liquid crystals, indicating that suppression in mobility of mesogens in PLCs does not affect significantly the thermodynamically controlled process.

• OSTI ID: 5776539
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 95:2; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
AROMATICS
BIPHENYL
CHEMICAL REACTIONS
CRYSTALS
DATA
EXPERIMENTAL DATA
FLUIDS
HYDROCARBONS
INFORMATION
LIQUID CRYSTALS
LIQUIDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHASE TRANSFORMATIONS
PHOTOCHEMICAL REACTIONS
PHYSICAL PROPERTIES
POLYMERS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE