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Titolo:
Novel polypyromellitimides and their liquid crystal aligning properties
Autore:
Jung, JC; Lee, KH; Sohn, BS; Lee, SW; Ree, M;
Indirizzi:
Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Polymer Res Inst, Ctr Adv Funct Polymers, Pohang 790784, South Korea Pohang Univ Sci & Technol Pohang South Korea 790784 790784, South Korea Pohang Univ Sci & Technol, Dept Chem, Pohang 790784, South Korea Pohang Univ Sci & Technol Pohang South Korea 790784 790784, South Korea
Titolo Testata:
MACROMOLECULAR SYMPOSIA
, volume: 164, anno: 2001,
pagine: 227 - 238
SICI:
1022-1360(200102)164:<227:NPATLC>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
RIGID-ROD POLYIMIDES; SIDE-CHAINS; MOLECULAR-ORIENTATION; PHASE-BEHAVIOR; ALIGNMENT; SURFACE; DIANHYDRIDES; DISPLAYS; LAYERS; FILMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Jung, JC Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Polymer Res Inst,Ctr Adv Funct Polymers, San 31, Pohang 790784, South Korea Pohang Univ Sci& Technol San 31 Pohang South Korea 790784 Korea
Citazione:
J.C. Jung et al., "Novel polypyromellitimides and their liquid crystal aligning properties", MACRO SYMP, 164, 2001, pp. 227-238

Abstract

Various aromatic poly{3.6-bis[(4-n-alkyloxy)phenyloxy]pyromellitimide}s [poly(Ar-C-m-PMDA)s. m=1, 4, 8, 12] were prepared in film form by routine two-step condensation of 3.6-bis[(4-n-alkyloxy)phenyloxy]pyromellitic dianhydrides (C-m-PMDAs) with various aromatic diamines. After characterization of their chemical structures their solution, thermal and liquid crystal (LC)-aligning properties in terms of pretilt angle at various rubbing densities were measured and discussed with respect to their backbone structures. All polyimide films showed excellent thermal stability and homogeneous LC alignment, but the poly(p-phenylene-C-12-PMDA) exhibited completely homeotropic alignment while the pretilt angle values of poly(p-phenylene-C-8-PMDA) varied with varying rubbing density.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 18:00:31