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Multiple melting and crystallization of nylon-66/montmorillonite nanocomposites

Authors

  • Qing-Xin Zhang,

    1. Center for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering (J07), The University of Sydney, Sydney NSW 2006, Australia
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  • Zhong-Zhen Yu,

    Corresponding author
    1. Center for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering (J07), The University of Sydney, Sydney NSW 2006, Australia
    • Center for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering (J07), The University of Sydney, Sydney NSW 2006, Australia
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  • Mingshu Yang,

    1. State Key Laboratory of Engineering Plastics, Center for Molecular Science, Institute of Chemistry, The Chinese Academy of Sciences, P.O. Box 2709, Beijing 100080, China
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  • Jun Ma,

    1. Center for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering (J07), The University of Sydney, Sydney NSW 2006, Australia
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  • Yiu-Wing Mai

    1. Center for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering (J07), The University of Sydney, Sydney NSW 2006, Australia
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Abstract

Nylon-66 nanocomposites were prepared by melt-compounding nylon-66 with organically modified montmorillonite (MMT). The organic MMT layers were exfoliated in a nylon-66 matrix as confirmed by wide-angle X-ray diffraction (WAXD) and transmission electron microscopy. The presence of MMT layers increased the crystallization temperature of nylon-66 because of the heterogeneous nucleation of MMT. Multiple melting behavior was observed in the nylon-66/MMT nanocomposites, and the MMT layers induced the formation of form II spherulites of nylon-66. The crystallite sizes L100 and L010 of nylon-66, determined by WAXD, decreased with an increasing MMT content. High-temperature WAXD was performed to determine the Brill transition in the nylon-66/MMT nanocomposites. Polarized optical microscopy demonstrated that the dimension of nylon-66 spherulites decreased because of the effect of the MMT layers. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 2861–2869, 2003

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