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Titolo:
Correlation between molecular structure, free volume, and physical properties of a wide range of main chain thermotropic liquid crystalline polymers
Autore:
Hsieh, TT; Tiu, C; Simon, GP;
Indirizzi:
UMC, Adv Technol Dev, Hsinchu 30077, Taiwan UMC Hsinchu Taiwan 30077UMC, Adv Technol Dev, Hsinchu 30077, Taiwan Monash Univ, Dept Mat Engn, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 Engn, Clayton, Vic 3168, Australia Monash Univ, Dept Chem Engn, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 Engn, Clayton, Vic 3168, Australia
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 9, volume: 82, anno: 2001,
pagine: 2252 - 2267
SICI:
0021-8995(20011128)82:9<2252:CBMSFV>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON-ANNIHILATION LIFETIME; CURED EPOXY POLYMERS; MECHANICAL-PROPERTIES; PRESSURE-DEPENDENCE; BLENDS; POLYESTERS; COPOLYESTER; COPOLYMERS; POLYCARBONATE; SPECTROSCOPY;
Keywords:
thermotropic liquid crystalline polymer; glass transition; positron annihilation; free volume;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Simon, GP Monash Univ, Dept Mat Engn, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 ton, Vic 3168, Australia
Citazione:
T.T. Hsieh et al., "Correlation between molecular structure, free volume, and physical properties of a wide range of main chain thermotropic liquid crystalline polymers", J APPL POLY, 82(9), 2001, pp. 2252-2267

Abstract

Physical phenomena such as glass transition temperatures, melting points, and relaxational behavior have been determined for a wide range of thermotropic liquid crystalline polymers (TLCPs) and polycarbonate (PC). Damping intensities of rigid TLCPs during glass transition are greater than those of semirigid and semiflexible TLCPs. Positron annihilation lifetime spectroscopy was also employed to evaluate free volume parameters of polymers, In general, the positron annihilation lifetime spectroscopy (PALS) free volume parameters show that all TLCPs have much smaller, fewer free volume sites compared with PC. Correlations were found between PALS free volume parameters and glass transition temperature, dynamic mechanical damping strength, and bulk density where greater free volume parameters corresponded to higher glass transition temperatures, greater damping strength, and lower density. (C) 2001 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 13:14:46