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Evolution of phase morphology and ‘network-like’ structure of multiwall carbon nanotubes in binary polymer blends during melt-mixing

Authors

  • Amrita V. Poyekar,

    1. IITB-Monash Research Academy, Indian Institute of Technology Bombay, Powai, Mumbai, India
    2. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai, India
    3. Department of Materials Engineering, Monash University, Clayton, VIC, Australia
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  • Arup R. Bhattacharyya,

    Corresponding author
    1. IITB-Monash Research Academy, Indian Institute of Technology Bombay, Powai, Mumbai, India
    2. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai, India
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  • Ajay S. Panwar,

    1. IITB-Monash Research Academy, Indian Institute of Technology Bombay, Powai, Mumbai, India
    2. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai, India
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  • George P. Simon

    1. IITB-Monash Research Academy, Indian Institute of Technology Bombay, Powai, Mumbai, India
    2. Department of Materials Engineering, Monash University, Clayton, VIC, Australia
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Abstract

Polyamide6 (PA6)/acrylonitrile butadiene styrene copolymer (ABS) blends with unmodified multiwall carbon nanotubes (MWNTs) were prepared via melt-blending in a conical twin-screw micro-compounder with varying melt-mixing time. To improve the state of dispersion of MWNTs, non-covalent organic modifiers for MWNTs have been utilized: sodium salt of 6-amino hexanoic acid (Na-AHA) and 1-pyrene-carboxaldehyde (PyCHO). PA6/ABS blends with MWNTs have shown a phase morphology transition from ‘matrix-dispersed droplet’ type to ‘co-continuous’ type as a function of melt-mixing time with the exception of 40/60 PA6/ABS blend with PyCHO-modified MWNTs. Non-isothermal crystallization studies revealed the heterogeneous nucleating action of MWNTs through the presence of double crystallization exothermic peaks (at ∼192°C and >200°C) while pure PA6 shows bulk crystallization peak at ∼192°C. 40/60 and 60/40 (wt/wt) PA6/ABS blends with 5 wt% unmodified MWNTs exhibited electrical conductivity values of ∼3.9 × 10−11 S/cm and ∼4.36 × 10−6 S/cm, respectively. A significant enhancement in electrical conductivity was observed with Na-AHA and PyCHO-modified MWNTs (order of ∼10−6 and ∼10−4 S/cm, respectively). POLYM. ENG. SCI., 55:429–442, 2015. © 2014 Society of Plastics Engineers

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