TY - JOUR
T1 - Phase separated structure-electro-optical property relationships of (Polymer/Liquid Crystal) composite film
AU - Kajiyama, Tisato
AU - Park, Kwansun
AU - Usul, Fumihiko
AU - Kikuchi, Hirotsugu
AU - Takahara, Atsushi
N1 - Funding Information:
This work was supported in part by a Grant for International Joint Research Project from NEDO, Japan
Publisher Copyright:
© 1993 SPIE. All rights reserved.
PY - 1993/8/13
Y1 - 1993/8/13
N2 - The (polymer/liquid crystal) composite films were prepared from a solution of poly(dipropylfumarate) (Pdi-IPF) and nematic liquid crystal (LC) by a solvent casting method. The phase separated structure of the composite film was controlled by solvent evaporation rate. The light scattering (LS) profile of a (Pdi-iPF/LC: 40/60 w/w) solution during solvent evaporation, exhibited a periodic structure, indicating that the phase separated structure was formed by spinodal decomposition. The aggregation structure of the composite film was investigated on the basis of a scanning electron microscope(SEM). SEM observation of the composite film suggested the presence of periodicity and dual connectivity of polymer and LC phases. The faster the solvent was evaporated, the smaller the LC channel (domain) size in the composite film was. The electro-optical behavior of the composite film was strongly depended on the LC channel (domain) size in the composite film. The transmittance increased, and also the rise and decay response times(tR and tD) decreased and increased, respectively, with an increase in size of LC channel (domain).
AB - The (polymer/liquid crystal) composite films were prepared from a solution of poly(dipropylfumarate) (Pdi-IPF) and nematic liquid crystal (LC) by a solvent casting method. The phase separated structure of the composite film was controlled by solvent evaporation rate. The light scattering (LS) profile of a (Pdi-iPF/LC: 40/60 w/w) solution during solvent evaporation, exhibited a periodic structure, indicating that the phase separated structure was formed by spinodal decomposition. The aggregation structure of the composite film was investigated on the basis of a scanning electron microscope(SEM). SEM observation of the composite film suggested the presence of periodicity and dual connectivity of polymer and LC phases. The faster the solvent was evaporated, the smaller the LC channel (domain) size in the composite film was. The electro-optical behavior of the composite film was strongly depended on the LC channel (domain) size in the composite film. The transmittance increased, and also the rise and decay response times(tR and tD) decreased and increased, respectively, with an increase in size of LC channel (domain).
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U2 - 10.1117/12.151211
DO - 10.1117/12.151211
M3 - Conference article
AN - SCOPUS:0343999070
SN - 0277-786X
VL - 1911
SP - 122
EP - 131
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
T2 - Liquid Crystal Materials, Devices, and Applications II 1993
Y2 - 31 January 1993 through 5 February 1993
ER -