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Titolo:
Micromechanics of nanocomposites: comparison of tensile and compressive elastic moduli, and prediction of effects of incomplete exfoliation and imperfect alignment on modulus
Autore:
Brune, DA; Bicerano, J;
Indirizzi:
Dow Chem Co USA, M E Pruitt Res Ctr, Midland, MI 48674 USA Dow Chem Co USA Midland MI USA 48674 ruitt Res Ctr, Midland, MI 48674 USA
Titolo Testata:
POLYMER
fascicolo: 2, volume: 43, anno: 2002,
pagine: 369 - 387
SICI:
0032-3861(200201)43:2<369:MONCOT>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
NYLON-6 CLAY HYBRID; LAYERED SILICATE NANOCOMPOSITES; POLYMER MELT INTERCALATION; MECHANICAL-PROPERTIES; 6-CLAY HYBRID; EPOXY NANOCOMPOSITES; COMPOSITES; BEHAVIOR; MODEL;
Keywords:
nanocomposites; micromechanics; tensile and compressive elastic moduli;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Bicerano, J Dow Chem Co USA, M E Pruitt Res Ctr, 1702 Bldg, Midland, MI 48674 USA Dow Chem Co USA 1702 Bldg Midland MI USA 48674 d, MI 48674 USA
Citazione:
D.A. Brune e J. Bicerano, "Micromechanics of nanocomposites: comparison of tensile and compressive elastic moduli, and prediction of effects of incomplete exfoliation and imperfect alignment on modulus", POLYMER, 43(2), 2002, pp. 369-387

Abstract

This paper addresses three important aspects, neglected in all previous literature, of the micromechanics of nanocomposites reinforced by platelet-shaped fillers. (a) A model was developed to predict the buckling of platelets in reinforced materials under compressive loading. This model predicts a critical strain above which platelet buckling, and hence a reduction in thecompressive modulus relative to the tensile modulus, would be expected to occur. It was used to show that compressive modulus should not be reduced relative to tensile modulus in a typical polypropylene nanocomposite. (b) A model was developed to account for the reduction of the reinforcement efficiency of clay platelets of high aspect ratio in a polymer matrix as a result of the incomplete exfoliation of platelets into 'pseudoparticle' stacks containing polymer layers sandwiched between successive clay platelet layersrather than into individual perfectly exfoliated and well-dispersed platelets. It was shown that incomplete exfoliation has a very significant detrimental effect on the reinforcement efficiency. (c) A model was also developed for the reduction of the reinforcement efficiency as a result of the deviation of the platelet orientation from perfect biaxial in-plane. It was shown that the deviation of the platelet orientation from perfect biaxial in-plane also has a very significant detrimental effect on the reinforcement efficiency. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 01:21:06