Elongational properties and crystallization of poly (isobutylene) melts probed by synchrotron radiation
A. Gonzalez-Alvareza,*, M. Arellanoa, O. Diatb, J.F. Legrandc and J.M. Piaud
a Departamento de Ingeniería Química, CUCEI, Universidad de Guadalajara, Blvd. Marcelino García Barragán 1451, Guadalajara, Jal. 44430 MEXICO.
b European Synchrotron Radiation Facility BP 220, F-38043, Grenoble FRANCE.
c UMR 585 (CEA-CNRS-Université Joseph Fourier) DRFMC/CEA Grenoble 17 rue des Martyrs, 38054, Grenoble FRANCE.
]]> d Laboratoire de Rhéologie, Université Joseph Fourier. Grenoble 1, Institut National Polytechnique de Grenoble, et CNRS (UMR) 5520 Domaine Universitaire B. P. 53 F-38041 Grenoble, France Cedex 9.
Recibido el 13 de enero de 2004.
Aceptado el 26 de abril de 2004.
Abstract
In this paper, we describe a phase transition in poly(isobutylene) of various molecular weight under elongational stress. Rheometry and wide angle X-ray diffraction have been performed simultaneously to correlate mechanical and structural properties of the material. The low molecular weight samples did not crystallize under the flow in the range of the strain rates applied. On the other hand, as the molecular weight increases the crystallization is always preceded by a strain of the samples under stretching.
Keywords: Elongational viscosity; crystallization; strain hardening; poly(isobutylene).
Resumen
]]> En este trabajo se describe la transición de fases de poliisobutileno de varios pesos moleculares sometidos a esfuerzos elongacionales. Experimentos de reometría y difracción de rayos X de ángulo amplio se realizan simultáneamente para correlacionar las propiedades mecánicas y la estructura del material. Muestras de polímero de bajo peso molecular no cristalizan en el intervalo de velocidades de deformación aplicadas. Al incrementar el peso molecular del polímero la cristalización obtenida es precedida por un endurecimiento del material debido a la deformación.Descriptores: Viscosidad elongacional; cristalización; endurecimiento debido a la deformación; poliisobutileno.
PACS: 83.20.Hn
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