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Effects of three surfactant types of anionic, cationic and non-ionic on tensile properties and fracture surface morphology of epoxy/MWCNT nanocomposites

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Abstract

Three types of surfactants were used to enhance the dispersion of multi-wall carbon nanotubes (MWCNTs) in the epoxy matrix. MWCNTs were separately treated with non-ionic (polyoxyethylene octyl phenyl ether, Triton X-100), cationic (hexadecyl-trimethyl-ammonium bromide, CTAB) and anionic (sodium dodecyl sulfate, SDS) surfactants and their effects were evaluated on the dispersion state and surface chemistry, as well as on the tensile properties and tensile fracture surface morphology of MWCNTs/epoxy nanocomposites. The active surfaces of the carbon nanotubes were characterized by FTIR. The non-ionic surfactant, Triton X-100, had the best effect on dispersion of the MWCNT in the epoxy matrix, thus, positively affecting the tensile parameters of the corresponding nanocomposites which were attributed to the “bridging” effects between the MWCNT and epoxy, introduced by the hydrophobic and hydrophilic heads of the corresponding surfactant. Presence of MWCNTs as reinforcing agent increased the elastic modulus of nanocomposites, indicating the improved interfacial adhesion between CNTs and polymer matrix. The regions of nucleation and propagation of cracks were clearly seen in the SEM micrographs of the tensile fracture surface of the nanocomposites. The cracks deviated on reaching the carbon nanotubes. The dispersing aiding capabilities of the three surfactants used in the present study were as follows: cationic < anionic < non-ionic.

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Authors and Affiliations

  1. Polymer Research Center, Department of Chemical Engineering, College of Engineering, University of Razi, 67149, Kermanshah, Iran

    Shima Ghorabi, Laleh Rajabi & Ali Ashraf Derakhshan

  2. Membrane Research Center, Department of Chemical Engineering, University of Razi, Kermanshah, Iran

    Sayed Siavash Madaeni & Sirus Zinadini

Authors
  1. Shima Ghorabi
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  2. Laleh Rajabi
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  3. Sayed Siavash Madaeni
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  4. Sirus Zinadini
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  5. Ali Ashraf Derakhshan
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Correspondence to Laleh Rajabi.

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Ghorabi, S., Rajabi, L., Madaeni, S.S. et al. Effects of three surfactant types of anionic, cationic and non-ionic on tensile properties and fracture surface morphology of epoxy/MWCNT nanocomposites. Iran Polym J 21, 121–130 (2012). https://doi.org/10.1007/s13726-011-0013-y

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  • DOI: https://doi.org/10.1007/s13726-011-0013-y

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