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Titolo:
Perfectly alternating ethylene-carbon monoxide copolymer crystallized epitaxially on alkali halides. 3. Lamellar and crystalline core thicknesses
Autore:
Fujita, M; Tsuji, M; Kohjiya, S;
Indirizzi:
Kyoto Univ, Inst Chem Res, Div States & Struct 3, Lab Polymer Condensed States, Kyoto 6110011, Japan Kyoto Univ Kyoto Japan 6110011 er Condensed States, Kyoto 6110011, Japan
Titolo Testata:
MACROMOLECULES
fascicolo: 22, volume: 34, anno: 2001,
pagine: 7724 - 7729
SICI:
0024-9297(20011023)34:22<7724:PAEMCC>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEM; MORPHOLOGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Tsuji, M Kyoto Univ, Inst Chem Res, Div States & Struct 3, Lab Polymer Condensed States, Kyoto 6110011, Japan Kyoto Univ Kyoto Japan 6110011 sed States, Kyoto 6110011, Japan
Citazione:
M. Fujita et al., "Perfectly alternating ethylene-carbon monoxide copolymer crystallized epitaxially on alkali halides. 3. Lamellar and crystalline core thicknesses", MACROMOLEC, 34(22), 2001, pp. 7724-7729

Abstract

Edge-on lamellar crystals of perfectly alternating ethylene-carbon monoxide copolymer (poly(3-oxotrimethylene); POK) were isothermally grown from a dilute solution in nitrobenzene epitaxially on the (001) surface of KI at various crystallization temperatures (T-c = 150-190 degreesC). The resulting crystals were observed by transmission electron microscopy (TEM) in bright-and dark-field imaging modes and also by high-resolution TEM (HRTEM), to measure the lamellar and the crystalline core thicknesses of the POK edge-onlamellae. The dark-field images obtained by conventional TEM and the (110)lattice images obtained by HRTEM showed that the crystalline core thickness of each lamella is inevitably smaller than the corresponding lamellar thickness. For the crystals grown at any Tc, the crystalline core thickness is, roughly speaking, 50-60% of the corresponding lamellar thickness. The crystalline core thickness increases with increasing T, and, of course, with increasing lamellar thickness. Thus, the POK lamella has a surface layer (20-25% of the lamellar thickness) containing folds on each basal side of the lamella.

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Documento generato il 08/04/20 alle ore 11:49:16