Electro-optical effect without hysteresis for (polymer/liquid crystal) composite films

Hirotsugu Kikuchi, Hwan Kyeong Jeong, Tisato Kajiyama

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Phase-separation behavior of the composite films composed of polymer of a three dimensional network and low molecular weight liquid crystals (LCs) embedded in the network was studied on the basis of the evolution of optical heterogeneity in a casting solution during a film formation process and the morphology of the polymer networks. The electro-optical properties of the composite films based on electric field controlled light scattering were strongly dependent on the size of LC domains which was controlled by the solvent evaporation rate. When poly(diisopropyl fumarate), which is incompatible with the LC, was used as the matrix polymer, no electro-optical hysteresis was detected, while considerable electro-optical hysteresis was done for the composite film consisting of poly(methyl methacrylate), which is fairly compatible with the LC. However, when poly(methyl methacrylate) with high molecular weight (996k) was used as the matrix polymer, hysteresis decreased due to a decrease of compatibility.

Original languageEnglish
Pages (from-to)209-223
Number of pages15
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume318
Publication statusPublished - 1998

Fingerprint

electro-optical effect
Liquid Crystals
Liquid crystal polymers
Composite films
Electrooptical effects
Liquid crystals
Hysteresis
hysteresis
liquid crystals
composite materials
polymers
Polymethyl Methacrylate
Polymer matrix
Polymethyl methacrylates
polymethyl methacrylate
Polymers
Molecular weight
Fumarates
evaporation rate
low molecular weights

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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AU - Kajiyama, Tisato

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