Article (Scientific journals)
Stretching calorimetry studies of poly(epsilon-caprolactone)/organoclay nanocomposites
Karaman, Vitaly M; Privalko, Eleonora G; Valery, P Privalko et al.
2005In Polymer, 46 (6), p. 1943-1948
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Keywords :
nanostructured material; nanocomposite; clay
Abstract :
[en] Poly(epsilon-caprolactone)/montmorillonite nanocomposites, prepared by bulk ring-opening polymerization of epsilon-caprolactone in the presence of tin(II) 2-ethylhexanoate as a catalyst and hydroxy groups of ammonium tethers of organoclay acting as chain-growth centers, were characterized by the stretching calorimetry technique. In the range of elastic (reversible) deformations, experimental Young's moduli and linear thermal expansivities of both the intercalated and exfoliated nanocomposites could be fitted to the predictions of Chow's model assuming the apparent aspect ratio of clay nanoparticles of the order of 10. In the range of anelastic deformations, the values of the internal energy increments DeltaU/m for the intercalated nanocomposite lay somewhat below those for the corresponding neat polymer, while the DeltaU/m vs. epsilon plots for the exfoliated nanocomposite and for the corresponding neat polymer were nearly identical both in shape and in absolute values over the entire range of strains, up to the breaking strains epsilon(b). These data suggested higher and lower probabilities of interfacial debonding in the range of anelastic deformations for intercalated and exfoliated samples, respectively.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Karaman, Vitaly M;  National Academy of Sciences of Ukraine, Kyiv, Ukraine > Institute of Macromolecular Chemistry
Privalko, Eleonora G;  National Academy of Sciences of Ukraine, Kyiv, Ukraine > Institute of Macromolecular Chemistry
Valery, P Privalko;  National Academy of Sciences of Ukraine, Kyiv, Ukraine > Institute of Macromolecular Chemistry
Kubies, Dana;  Academy of Sciences of the Czech Republic, Prague, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague, Czech Republic > Institute of Macromolecular Chemistry
Puffr, Rudolf;  Academy of Sciences of the Czech Republic, Prague, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague, Czech Republic > Institute of Macromolecular Chemistry
Jérôme, Robert ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Stretching calorimetry studies of poly(epsilon-caprolactone)/organoclay nanocomposites
Publication date :
24 February 2005
Journal title :
Polymer
ISSN :
0032-3861
eISSN :
1873-2291
Publisher :
Elsevier Sci Ltd, Oxford, United Kingdom
Volume :
46
Issue :
6
Pages :
1943-1948
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
The Grand Agency of ASCR (grant No. KJB 4050309)
Commentary :
The authors acknowledge Polymer (Elsevier) for allowing them to archive this paper.
Available on ORBi :
since 26 February 2009

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