Novel composite material structures for large panel displays and controlled transparency windows

Maria Helena Godinho, J. L. Figueirinhas, A. Almeida, A. F. Martins

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Polymer dispersed liquid crystals (PDLC) based on films from cellulose derivatives seem promising composite materials for electro-optic applications such as controlled transparency windows [1]. This kind of materials are composed of a solid film impregnated by a nematic liquid crystal and placed between two transparent conducting substrates. The solid films (12-21 mu m thick) were cast from liquid solutions of the cellulose derivative hydroxypropylcellulose (HPC) with a nominal molecular weight of 100000 in acetone. The electro-optical behaviour of several of these cells was characterised by light transmission for different preparation conditions of the solid films that were obtained on different moulds. Scanning electron microscopy (SEM) was used to characterise the films morphology. The results obtained show that these systems exhibit high transmission coefficients in the on state and that the cell's optical response is very strongly dependent on the free-surface plane rugosity of the solid films.
Original languageEnglish
Title of host publicationEUROMAT 97 - PROCEEDINGS OF THE 5TH EUROPEAN CONFERENCE ON ADVANCED MATERIALS AND PROCESSES AND APPLICATIONS: MATERIALS, FUNCTIONALITY & DESIGN, VOL 2
EditorsL. A. J. Sarton, H. B. Zeedijk
PublisherNetherlands Society of Materials Science
Pages111-114
ISBN (Print)90-803513-2-6
Publication statusPublished - 1997
Event5th European Conference on Advanced Materials and Processes and Applications, EUROMAT 97 - Maastricht, Netherlands
Duration: 21 Apr 199723 Apr 1997

Conference

Conference5th European Conference on Advanced Materials and Processes and Applications, EUROMAT 97
CountryNetherlands
CityMaastricht
Period21/04/9723/04/97

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