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Journal of Materials Science

, Volume 43, Issue 5, pp 1745–1748 | Cite as

Viscoelasticity and macromolecular topology in single-site catalyzed polyethylene

  • Juan F. VegaEmail author
  • Dorian Polo-Cerón
  • Santiago Gómez-Ruíz
  • Sanjiv Prashar
  • Mariano Fajardo
  • Javier Martínez-Salazar
Letter

Introduction

The relationship between polymer chain topology, i.e. long chain branching (LCB), and rheological properties in polyolefins obtained using single-site catalysts has been the topic of major scientific activity since the late 1990s [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]. Indeed, melt-state rheological measurements are being considered as one of the most sensitive methods for detecting sparse LCB in polyethylene (PE) [ 1, 15]. For example the flow activation energy, E a, related to the temperature dependence of viscoelastic properties, is altered by the presence of LCB, and the cross-point frequency between storage and loss moduli, ω x, and the cross-point modulus, G x, are also very sensitive features to the molecular architecture [ 16, 17, 18]. In this context, the study of these properties can give us information about the relationship between polymer chain topology and catalyst structure. In this work, a set of PE samples was synthesized using different metallocene...

Keywords

Metallocene Catalyst Irganox 1010 Long Chain Branch Flow Activation Energy Linear Viscoelastic Regime 

Notes

Acknowledgements

J.F. Vega acknowledges the Ministerio de Educación y Ciencia (MEC), Spain, for a Ramón y Cajal Tenure (2006). We would like to thank the MEC (Projects MAT2006-0400 and CTQ2005-07918-C02-02/BQU), the Comunidad de Madrid (Project S-0505/PPQ-0328), and the Universidad Rey Juan Carlos (graduate fellowship for D. Polo-Cerón) for financial support.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Juan F. Vega
    • 1
    Email author
  • Dorian Polo-Cerón
    • 2
  • Santiago Gómez-Ruíz
    • 2
  • Sanjiv Prashar
    • 2
  • Mariano Fajardo
    • 2
  • Javier Martínez-Salazar
    • 1
  1. 1.Departamento de Física MacromolecularInstituto de Estructura de la Materia, CSICMadridSpain
  2. 2.Departamento de Química Inorgánica y AnalíticaE.S.C.E.T., Universidad Rey Juan CarlosMóstoles (Madrid)Spain

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