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Effects of the structural components on slow crack growth process in polyethylene blends. Composition intervals prediction for pipe applications

Authors

  • Rafael A. García,

    Corresponding author
    1. Department of Chemical and Environmental Technology, ESCET, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Móstoles, Madrid, Spain
    • Department of Chemical and Environmental Technology, ESCET, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Móstoles, Madrid, Spain===

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  • A. Carrero,

    1. Department of Chemical and Energy Technology, ESCET, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Móstoles, Madrid, Spain
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  • C. Martín,

    1. Centro de Tecnologia REPSOL-YPF, Ctra, de Extremadura, Km. 18, 28931 Madrid, Spain
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  • C. Domínguez

    1. Polymer Technology Laboratory (LATEP), Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Móstoles, Madrid, Spain
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Abstract

A linear low density polyethylene (LLDPE) obtained from a metallocene based catalyst, was blended in an extruder with a high density polyethylene (HDPE) homopolymer synthesized with an iron based catalyst. The bimodal polyethylenes, made with blends from 0 to 100 wt % of copolymer were characterized by SEC, DSC, ESEM, SEC-FTIR, and TREF, while their resistance to the slow crack growth (SCG) was evaluated through the PENT test. Results provide that polymer blends with copolymer contents between 47.5 and 72.5 wt % are suitable for pipe applications. Furthermore, a method based on the intercrystalline tie chains calculus is proposed as suitable and attractive, because of its simplicity and novelty, to forecast long term performance and to predict capabilities. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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