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Titolo:
Structural changes in poly(ethylene terephthalate) induced by mechanical milling
Autore:
Bai, C; Spontak, RJ; Koch, CC; Saw, CK; Balik, CM;
Indirizzi:
N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA N Carolina State Univ Raleigh NC USA 27695 & Engn, Raleigh, NC 27695 USA Hoechst Celanese Corp, Corp Res Ctr, Summit, NJ 07901 USA Hoechst CelaneseCorp Summit NJ USA 07901 p Res Ctr, Summit, NJ 07901 USA
Titolo Testata:
POLYMER
fascicolo: 19, volume: 41, anno: 2000,
pagine: 7147 - 7157
SICI:
0032-3861(200006)41:19<7147:SCIPTI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY(ETHYLENE-TEREPHTHALATE); POLYETHYLENE; POLYMERS; BLENDS;
Keywords:
poly(ethylene terephthalate); mechanical milling; crystallization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Balik, CM N Carolina State Univ, Dept Mat Sci & Engn, Box 7907, Raleigh, NC 27695 USA N Carolina State Univ Box 7907 Raleigh NC USA 27695 NC 27695 USA
Citazione:
C. Bai et al., "Structural changes in poly(ethylene terephthalate) induced by mechanical milling", POLYMER, 41(19), 2000, pp. 7147-7157

Abstract

Poly(ethylene terephthalate) (PET) has been subjected to high-energy ball milling (mechanical milling, MM) at three different temperatures. The resulting milled powder is characterized by molecular weight measurements, differential scanning calorimetry and wide-angle Xray scattering. Regardless of the initial degree of crystallinity or milling temperature employed, MM apparently yields an "oriented amorphous" PET morphology in which the PET chains are locally aligned but rotationally disordered. This conclusion is based on the persistence of the (100) peak in otherwise amorphous x-ray patterns from milled PET. Thermograms of milled PET exhibit a small, broad crystallization exotherm and a large melting endotherm. The unusually small crystallization enthalpy is attributed to the local orientation of PET molecules present in the oriented amorphous morphology. Only minor rotations and translations of oriented PET molecules are needed to put the chains into register and, hence, the crystalline state. Evidence is also presented to suggestthat extended-chain crystals of PET are produced upon crystallization of mechanically milled PET. (C) 2000 Elsevier Science Ltd. All rights reserved.

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Documento generato il 24/11/20 alle ore 09:31:10