Dynamic rheology and morphology of HDPE-fumed silica composites: Effect of interface modification

Authors

  • Sangita Nandi,

    Corresponding author
    1. GE India Technology Centre Pvt. Ltd., SABIC Innovative Plastics Program, Polymer Science & Technology Department, 122 EPIP Phase II, Bangalore 560066, India
    • GE India Technology Centre Pvt. Ltd., SABIC Innovative Plastics Program, Polymer Science & Technology Department, 122 EPIP Phase II, Bangalore 560066, India
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  • Sanjukta Bose,

    1. Centre for Polymer Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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  • Susanta Mitra,

    1. GE India Technology Centre Pvt. Ltd., SABIC Innovative Plastics Program, Polymer Science & Technology Department, 122 EPIP Phase II, Bangalore 560066, India
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  • Anup K. Ghosh

    1. Centre for Polymer Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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Abstract

In the present study, high density polyethylene (HDPE)-based composites containing different amounts of fumed silica (FS) were prepared by melt compounding in a corotating twin screw extruder. Polyethylene-g-maleic anhydride copolymer (PE-g-MA) containing 1 wt% maleic anhydride was used for interface modification between filler and polymer. The interaction between the surface hydroxyl groups of fumed silica nanoparticles with maleic anhydride groups of PE-g-MA led to a finer dispersion of the filler in the HDPE matrix. The terminal complex viscosity and terminal storage modulus were highest at 1 wt% filler loading due to widely spread network formation by FS nanoparticles. This filler network plausibly got disturbed at higher filler content and/or interface modification which was reflected in their stress relaxation behavior also. The dynamic rheological behavior of the composites was explained in terms of morphological observations. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

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