POLYAMIDE-TYPE HIGH PRETILT SURFACE - EFFECT OF SIDE-CHAIN STRUCTURE AND TYPE OF LIQUID-CRYSTALS ON THE GENERATION OF PRETILT ANGLE

Authors
NOH SH ARAKI K SUGITANI Y SENO M
Citation
Sh. Noh et al., POLYAMIDE-TYPE HIGH PRETILT SURFACE - EFFECT OF SIDE-CHAIN STRUCTURE AND TYPE OF LIQUID-CRYSTALS ON THE GENERATION OF PRETILT ANGLE, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 241, 1994, pp. 159-166
Citations number
12
Categorie Soggetti
Crystallography
Journal title
Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals → ACNP
ISSN journal
1058725X
Volume
241
Year of publication
1994
Pages
159 - 166
Database
ISI
SICI code
1058-725X(1994)241:<159:PHPS-E>2.0.ZU;2-J
Abstract
Highly N-aralkylated poly(p-phenylene terephthalamide) (PPTA) with var ious substituents having benzyl units in their structures were synthes ized in a high yield, and their properties as a liquid crystal alignme nt film were studied. Good liquid crystal alignment and pretilt angles of 0.5 to 8.1 deg were observed on the spin-coated polymer films afte r rubbing when a nematic liquid crystal, ZLI-2293 was used. The induce d pretilt angle showed no correlation with the surface-free energy of the polymer film, but was strongly dependent on the structure of the s ide chain. The effects of the structural difference of the side chain and type of liquid crystals are discussed in more detail.