A study of the surface anchoring at a polymer/liquid crystal interface in the neighbourhood of the glass transition
作者:
Yimin Ji,
JackR. Kelly,
JohnL. West,
期刊:
Liquid Crystals
(Taylor Available online 1993)
卷期:
Volume 14,
issue 6
页码: 1885-1893
ISSN:0267-8292
年代: 1993
DOI:10.1080/02678299308027724
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Recently, we have observed dramatic changes in the electro-optic properties of PDLC films composed of droplets of the liquid crystal E7 in a matrix of polyvinylformal (PVFM) in the vicinity of the glass transition temperature of the matrix. One plausible explanation for these changes is a decrease in the surface anchoring strength on passing through the glass transition. For this reason, we undertook a study of the surface anchoring strength between E7 and a thin film of PVFM using the technique of Yokoyama and van Sprang. To mimic the properties of the matrix more closely, we dissolved 20 per cent E7 liquid crystal into the PVFM film. The surface anchoring for this film was compared with that of a pure PVFM film. From these data, we observed no obvious changes in the surface anchoring on passing through the glass transition of the matrix. However, the incorporation of liquid crystal into the matrix did cause a decrease in the surface anchoring strength. We discuss the impact of these results on the interpretation of the PDLC electro-optic properties.
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