Application of a crystallization kinetics model to simulate the effect of operation conditions on Crystaf profiles and calibration curves

Authors

  • Siripon Anantawaraskul,

    Corresponding author
    1. Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, 50 Phaholyothin Rd., Jatujak, Bangkok, Thailand 10900
    2. Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, S&T Postgraduate Education and Research Development Office (PERDO), Bangkok, Thailand 10330
    • Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Jatujak, Bangkok, Thailand 10900
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  • Punnawit Somnukguandee,

    1. Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, 50 Phaholyothin Rd., Jatujak, Bangkok, Thailand 10900
    2. Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, S&T Postgraduate Education and Research Development Office (PERDO), Bangkok, Thailand 10330
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  • João B. P. Soares,

    1. Department of Chemical Engineering, Faculty of Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
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  • Jumras Limtrakul

    1. Department of Chemistry, Faculty of Science, Kasetsart University, 50 Phaholyothin Rd., Jatujak, Bangkok, Thailand 10900
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Abstract

Crystallization analysis fractionation (Crystaf) is a polymer characterization technique used to estimate chemical composition distributions (CCDs) of semicrystalline copolymers. The Crystaf profile can be transformed into a CCD using a calibration curve that relates average comonomer content to peak crystallization temperature. The calibration curve depends on copolymer molecular properties and Crystaf operation conditions. In this investigation, we applied a crystallization kinetics model to simulate Crystaf calibration curves and to quantify how Crystaf calibration curves depend on these factors. We applied the model to estimate the CCDs of three ethylene/1-hexene copolymers from Crystaf profiles measured at different cooling rates and showed that our predictions agree well with the CCDs described by Stockmayer's distribution. We have also used this new methodology to investigate the effects of cooling rate, molecular weight, and comonomer type on Crystaf profiles and calibration curves. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 866–876, 2009

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