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Titolo:
Changes in superstructure and mechanical properties of poly(ethylene-2,6-naphthalate) fibers with critical necking tension
Autore:
Suzuki, A; Kawada, T; Hasegawa, T;
Indirizzi:
Yamanashi Univ, Fac Engn, Dept Appl Chem & Biotechnol, Kofu, Yamanashi 4008511, Japan Yamanashi Univ Kofu Yamanashi Japan 4008511 ofu, Yamanashi 4008511, Japan
Titolo Testata:
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
fascicolo: 14, volume: 39, anno: 2001,
pagine: 1629 - 1637
SICI:
0887-6266(20010715)39:14<1629:CISAMP>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZONE-ANNEALING METHOD; DRAWING TEMPERATURE; HIGH-MODULUS; CRYSTALLIZATION; DEFORMATION; BEHAVIOR; FILMS;
Keywords:
zone drawing; poly(ethylene-2,6-naphthalate); drawing temperature; necking; critical necking tension;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Suzuki, A Yamanashi Univ, Fac Engn, Dept Appl Chem & Biotechnol, 4-3-11 Takeda, Kofu, Yamanashi 4008511, Japan Yamanashi Univ 4-3-11 Takeda Kofu Yamanashi Japan 4008511 Japan
Citazione:
A. Suzuki et al., "Changes in superstructure and mechanical properties of poly(ethylene-2,6-naphthalate) fibers with critical necking tension", J POL SC PP, 39(14), 2001, pp. 1629-1637

Abstract

Poly(ethylene-2,6-naphthalate) fibers were zone-drawn under a critical necking tension (sigma (c)) defined as the minimum tension needed to generate a necking at a given drawing temperature (T-d) In the zone drawing under sigma (c) the neck was observed from 110 to 160 degreesC. The superstructure in a neck zone induced at each T-d was studied. The sigma (c) value decreased exponentially with increasing T-d and dropped to a low level at a higherT-d. The draw ratio increased rapidly with T-d increasing above 90 degreesC, but the birefringence and degree of crystallinity decreased gradually. To study the molecular orientation in the neck zone, we measured a dichroic ratio (A(/) /A(perpendicular to)) of a C-O band at 1256 cm(-1) along a drawing direction in the neck zone with a Fourier transform infrared microscope. A(/)/A(perpendicular to) at T-d = 110 degreesC increased rapidly in the narrow neck zone, and that at T-d = 140 degreesC increased in the edge of the wide neck zone. Wide-angle X-ray diffraction patterns of the fibers obtained at T-d = 130 degreesC and lower showed three reflections due to an alpha form, but those at T-d = 140 and 150 degreesC had reflections due to the alpha form and a beta form. (C) 2001 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 13:08:47