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Abstract:

The architecture of an epoxy matrix was modified by curing the resin with mono-/diamine mixtures having identical chemical structures. Both hole volume and specific volume variations were studied by positron annihilation lifetime spec-troscopy and pressure-volume-temperature/density measurements, respectively. The average hole volume of the networks at room temperature slightly increased when the monoaminic chain extender content increased. The increment in the intermolecu-lar interactions between functional groups of the networks chains, ([0-9]{4})ue to the less hindered nitrogen introduced by the monoamine, appears to be the responsible for the observed behavior. Besides, only small variations on the specific volume were observed on increasing the monoamine content, which points out that for a cured epoxy system, the chemical structure of the curing agent is mainly responsible for chain packing in the networks. On the other hand, intermolecular interactions between chains were considered as the key factor for fixing stiffness and strength. Thus, it was observed that the increase of the intermolecular interactions with the monoamine content produced a decrease in the sub-Tgsmall-range cooperative motions, which increased the low-deformation mechanical properties at temperatures between b and a relaxations. This conclusion could be applied to previous investigations with epoxy matrices not fully crosslinked (nonstoichiometric or noncompletely cured formulations). Finally, it was found that fracture properties do not significantly depend either on the hole volume or on the intermolecular interactions. Fracture properties are more dependent on the crosslink density and the glass transition temperature. © 2009 Wiley Periodicals, Inc.

Registro:

Documento: Artículo
Título:Intermolecular interactions on amine-cured epoxy matrices with different crosslink densities. influence on the hole and specific volumes and the mechanical behavior
Autor:Blanco, M.; Ramos, J.A.; Goyanes, S.; Rubiolo, G.; Salgueiro, W.; Somoza, A.; Mondragon, I.
Filiación:Materials Technologies Group, Dpto Ingeniería Química y M Ambiente, Universidad Paés Vasco/Euskal Herriko Unibertsitatea, Europa 1, 20018 Donostia-San Sebastian, Spain
Laboratorio de Polémeros y Materiales Compuestos, FCEYN, Univiversidad de Buenos Aires, Pabellón 1 Ciudad Universitaria, Buenos Aires 1424, Argentina
CONICET, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Argentina
Unidad de Actividad Materiales, Comisión Nacional de Energía Atómica, Avenida General Paz 1499, B1650KNA San Mart́n, Argentina
Instituto de Física de Materiales Tandil, Universidad Nacional del Centro de la Provincia de Buenos Aires, Pinto 399, B7000GHG, Argentina
Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Pinto 399, B7000GHG, Argentina
Palabras clave:Crosslink density; Crosslinking; Intermolecular interactions; Microstructure-properties relationships; Positron annihilation lifetime spectroscopy; Thermosets; Chain extenders; Chain packing; Chemical structure; Cooperative motion; Cross-link densities; Crosslink density; Crosslinked; Cured epoxy; Curing agents; Epoxy matrices; Fracture property; Glass transition temperature; Intermolecular interactions; Key factors; Mechanical behavior; Nonstoichiometric; Positron annihilation lifetime spectroscopy; Positron annihilation lifetimes; Room temperature; Small variations; Specific volume; Amines; Brittleness; Curing; Fracture; Functional groups; Glass transition; Mechanical properties; Microstructure; Positron annihilation; Positron annihilation spectroscopy; Resins; Structure (composition); Thermosets; Crosslinking
Año:2009
Volumen:47
Número:13
Página de inicio:1240
Página de fin:1252
DOI: http://dx.doi.org/10.1002/polb.21729
Título revista:Journal of Polymer Science, Part B: Polymer Physics
Título revista abreviado:J Polym Sci Part B
ISSN:08876266
CODEN:JPBPE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08876266_v47_n13_p1240_Blanco

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Citas:

---------- APA ----------
Blanco, M., Ramos, J.A., Goyanes, S., Rubiolo, G., Salgueiro, W., Somoza, A. & Mondragon, I. (2009) . Intermolecular interactions on amine-cured epoxy matrices with different crosslink densities. influence on the hole and specific volumes and the mechanical behavior. Journal of Polymer Science, Part B: Polymer Physics, 47(13), 1240-1252.
http://dx.doi.org/10.1002/polb.21729
---------- CHICAGO ----------
Blanco, M., Ramos, J.A., Goyanes, S., Rubiolo, G., Salgueiro, W., Somoza, A., et al. "Intermolecular interactions on amine-cured epoxy matrices with different crosslink densities. influence on the hole and specific volumes and the mechanical behavior" . Journal of Polymer Science, Part B: Polymer Physics 47, no. 13 (2009) : 1240-1252.
http://dx.doi.org/10.1002/polb.21729
---------- MLA ----------
Blanco, M., Ramos, J.A., Goyanes, S., Rubiolo, G., Salgueiro, W., Somoza, A., et al. "Intermolecular interactions on amine-cured epoxy matrices with different crosslink densities. influence on the hole and specific volumes and the mechanical behavior" . Journal of Polymer Science, Part B: Polymer Physics, vol. 47, no. 13, 2009, pp. 1240-1252.
http://dx.doi.org/10.1002/polb.21729
---------- VANCOUVER ----------
Blanco, M., Ramos, J.A., Goyanes, S., Rubiolo, G., Salgueiro, W., Somoza, A., et al. Intermolecular interactions on amine-cured epoxy matrices with different crosslink densities. influence on the hole and specific volumes and the mechanical behavior. J Polym Sci Part B. 2009;47(13):1240-1252.
http://dx.doi.org/10.1002/polb.21729