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Titolo:
DYNAMIC RELAXATION BEHAVIOR OF SOLVENT-CRYSTALLIZED POLY(ETHER ETHER KETONE)
Autore:
KALIKA DS; NICKELL JC; KRISHNASWAMY RK; BARTON BF;
Indirizzi:
UNIV KENTUCKY,DEPT CHEM ENGN LEXINGTON KY 40506
Titolo Testata:
Journal of polymer science. Part B, Polymer physics
fascicolo: 4, volume: 32, anno: 1994,
pagine: 759 - 772
SICI:
0887-6266(1994)32:4<759:DRBOSP>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-BEAM IRRADIATION; POLY(ARYL-ETHER-ETHER-KETONE) PEEK; NONREACTIVE LIQUIDS; METHYLENE-CHLORIDE; MATHEMATICAL-MODEL; POLY(ETHYLENE-TEREPHTHALATE); DIFFUSION; SORPTION; ABSORPTION; TRANSPORT;
Keywords:
POLY(ETHER ETHER KETONE) [PEEK]; SOLVENT-INDUCED CRYSTALLIZATION IN; DYNAMIC MECHANICAL THERMAL ANALYSIS OF PEEK; DIELECTRIC RELAXATION OF PEEK;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
D.S. Kalika et al., "DYNAMIC RELAXATION BEHAVIOR OF SOLVENT-CRYSTALLIZED POLY(ETHER ETHER KETONE)", Journal of polymer science. Part B, Polymer physics, 32(4), 1994, pp. 759-772

Abstract

The dynamic relaxation behavior of solvent-crystallized poly (ether ether ketone) (PEEK) has been investigated in the region of the glass-rubber (alpha) relaxation using dynamic mechanical and dielectric methods. Amorphous PEEK films were exposed to saturated methylene chloride and acetone vapor, with solvent-induced crystallization observed for both penetrants. Sample desorption at elevated temperatures (under vacuum) resulted in virtually complete removal of residual penetrant, thusproviding for the measurement of relaxation characteristics independent of plasticization. Both dynamic mechanical and dielectric studies indicated a marked positive offset in the isochronal relaxation temperatures of the solvent-crystallized samples relative to thermally crystallized specimens of comparable bulk crystallinity, and a higher apparent activation energy in the solvent-crystallized case. These results are consistent with the evolution of a tighter crystalline morphology (i.e., smaller crystal long spacing) in the solvent-crystallized samples, the crystallites imposing a greater degree of constraint on the long-range motions of the amorphous chains inherent to the glass-rubber relaxation. (C) 1994 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 03:08:35