摘要:

Following the formation of the International Liquid Crystal Society in Vancouver in 1990, a new periodical devoted to liquid crystals was established as the newsletter of the Society. Thus Liquid Crystals Today was born, and over the past four years it has published feature articles, book reviews, conference reports and various news items relating to liquid crystal scientists, events and developments. Liquid Crystals Today has been welcomed by the liquid crystal community, and its popular style has attracted much favourable comment. This success has encouraged the Society to look for ways of enhancing Liquid Crystals Today, and establishing it as an interface between liquid crystal technology and the more fundamental aspects of liquid crystal science. Through an agreement between the International Liquid Crystal Society and Taylor & Francis, publishers of the journal Liquid Crystals, from 1995 the new Liquid Crystals Today will be jointly published in an expanded format by the Society and Taylor & Francis.

ISSN:1358-314X    

DOI:10.1080/13583149508047581

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:1358-314X    

DOI:10.1080/13583149508047582

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The field of polymer liquid crystals is encompassing an increasingly wide range of research areas and applications, as was demonstrated at a recent one day meeting devoted to the subject. The meeting was held in London at the Scientific Societies Lecture Theatre, and was organized by the Institute of Physics Polymer Physics Group and co-sponsored by the British Liquid Crystal Society and the Royal Society of Chemistry.

ISSN:1358-314X    

DOI:10.1080/13583149508047584

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:1358-314X    

DOI:10.1080/13583149508047585

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The “marriage” between low molecular weight liquid crystals and polymers burgeoned in the 1980s with the idea of dispersing liquid crystal droplets in a rigid polymer matrix to create an electrically controllable light scattering medium. The orientation of the liquid crystal droplets, and hence the refractive index match and scattering, can be systematically controlled with an electric field. Today, dispersions of liquid crystals and polymers are found in many forms depending on the concentration of polymer, which can be as large as 70% or as small as 1%. The systems most understood are those of larger concentration where the liquid crystal is segregated out in the form of droplets randomly distributed throughout the surrounding polymer (see page 2). Dispersions of liquid crystals and polymers differ from macroscopic bulk liquid crystals because of the large surface-to-volume ratio and symmetry breaking non-planar geometry imposed by the polymer. Their composite nature profoundly affects the ordering of the liquid crystal, and their susceptibility to external fields makes them suitable for many new electro-optic applications, as well as intellectually challenging to study from the basic science perspective.

ISSN:1358-314X    

DOI:10.1080/13583149508047586

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

A key issue in the area of side chain liquid crystal polymers concerns the conformation of the backbone within the mesophase. In order to resolve this matter, Noirez and co-workers (Liquid Crystals, 1995, 18 129) have studied a wide range of polymers exhibiting both nematic and smectic behaviour using small angle neutron scattering. Their results combined with a survey of those in the literature reveal that if the polymer is solely nematogenic, then the backbone adopts a prolate conformation in which on average it lies along the director. By contrast, in a smectic phase the backbone adopts an oblate shape and on average lies perpendicularly with respect to the director. This arises from a microphase separation in which the backbones are distributed between the mesogenic layers. However, the backbones can cross the mesogenic layers although their ability t o do so depends on, amongst other factors, the degree of polymerization. If the polymer exhibits both nematic and smectic behaviour, then in the nematic phase the backbone adopts a slightly oblate shape resulting from smectic fluctuations.

ISSN:1358-314X    

DOI:10.1080/13583149508047587

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:1358-314X    

DOI:10.1080/13583149508047589

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:1358-314X    

DOI:10.1080/13583149508047580

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor