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Nanoindentation and dynamic mechanical properties of PP/clay nanocomposites

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Abstract

Polypropylene/clay nanocomposites were prepared by melt blending technique. A PP homopolymer was melt blended with commercial nanoclay masterbatch at different concentration (5, 10 and 15 wt% of nanoclay) using Laboratory Mixing Extruder (LME). The morphology of the nanocomposites was characterized using Scanning Electron Microscope (SEM). The viscoelastic and thermo-mechanical properties were analyzed via Dynamic Mechanical Analysis (DMA). The morphological analysis showed that the nanoclay was well distributed in the PP matrix. The DMA analysis showed an increase in storage modulus of nanocomposites which indicates an enhancement of stiffness and thermal stability of the prepared nanocomposite samples. In addition, a nanoindentation test was performed to determine the dynamic nanomechanical properties of two nanocomposites samples (NS-5 and NS-15). Load sweep test results showed that NS-15 has a slightly higher storage and loss modulus than that of NS-5. Both the samples also showed a decreasing modulus as a function of depth, indicating the presence of a stiffer surface layer in the samples. Frequency sweep tests were also performed on each sample, and display a moderate viscoelasticity with modulus values that increased slightly as a function of frequency. Load-controlled ramping force scratch test was also carried out and the results showed that NS-15 had a greater elastic recovery than sample NS-5 as well as a greater overall scratch resistance.

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Acknowledgments

Author’s like to thank Hysitron, USA for nanomechanical analysis.

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Authors and Affiliations

  1. Department of Chemical Engineering, King Saud University, Riyadh, Saudi Arabia

    Achmad Chafidz & Saeed Al-Zahrani

  2. SABIC Polymer Research Center, King Saud University, Riyadh, Saudi Arabia

    Achmad Chafidz, Ilias Ali, M. E. Ali Mohsin & Saeed Al-Zahrani

  3. Research and Development Department, Printpack Inc, 400 Packets Crt, Williamsburg, VA, 23185, USA

    Rabeh Elleithy

Authors
  1. Achmad Chafidz
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  2. Ilias Ali
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  3. M. E. Ali Mohsin
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  4. Rabeh Elleithy
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  5. Saeed Al-Zahrani
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Correspondence to Ilias Ali.

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Chafidz, A., Ali, I., Mohsin, M.E.A. et al. Nanoindentation and dynamic mechanical properties of PP/clay nanocomposites. J Polym Res 19, 9906 (2012). https://doi.org/10.1007/s10965-012-9906-5

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  • DOI: https://doi.org/10.1007/s10965-012-9906-5

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