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Titolo:
SIMULTANEOUS SAXS WAXS AND DSC ANALYSIS OF THE MELTING AND RECRYSTALLIZATION BEHAVIOR OF QUENCHED POLYPROPYLENE
Autore:
OKANE WJ; YOUNG RJ; RYAN AJ; BRAS W; DERBYSHIRE GE; MANT GR;
Indirizzi:
UNIV MANCHESTER,UMIST,POLYMER SCI & TECHNOL GRP MANCHESTER M60 1QD LANCS ENGLAND UNIV MANCHESTER,UMIST,POLYMER SCI & TECHNOL GRP MANCHESTER M60 1QD LANCS ENGLAND SERC,DARESBURY LAB WARRINGTON WA4 4AD CHESHIRE ENGLAND
Titolo Testata:
Polymer
fascicolo: 7, volume: 35, anno: 1994,
pagine: 1352 - 1358
SICI:
0032-3861(1994)35:7<1352:SSWADA>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
ISOTACTIC POLYPROPYLENE;
Keywords:
QUENCHED POLYPROPYLENE; MONOCLINIC POLYPROPYLENE; SYNCHROTRON RADIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
W.J. Okane et al., "SIMULTANEOUS SAXS WAXS AND DSC ANALYSIS OF THE MELTING AND RECRYSTALLIZATION BEHAVIOR OF QUENCHED POLYPROPYLENE", Polymer, 35(7), 1994, pp. 1352-1358

Abstract

The behaviour of a quenched ethylene-propylene block copolymer cast film has been investigated during melting and recrystallization experiments carried out at heating and cooling rates of 10-degrees-C min-1. The experimental techniques used to follow the melting and recrystallization processes were differential scanning calorimetry (d.s.c.) and simultaneous small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS). In particular, the WAXS results show that the meltingof the material is preceded by a solid-state transition involving transformation of the quenched structure into the monoclinic alpha modification. This transition appears as an exotherm in the range 65-120-degrees-C on the d.s.c. melting trace. SAXS results show that an increasein the amount of long-range order occurs during this transition. The sample was then found to melt at 162-degrees-C. Upon cooling from the melt, recrystallization of the monoclinic alpha modification was foundto occur in the range 123-105-degrees-C without any apparent prior formation of the quenched structure.

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Documento generato il 28/09/20 alle ore 15:24:23