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Evaluation of The Effect of Molecular Weight, Mixing Approach and Compatibilizer on Morphologhy and Mechanical Properties of PP/PA/Clay Nanocomposite

Orshesh, Ziba | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40622 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Bagheri, Reza
  7. Abstract:
  8. Polypropylene/clay nanocomposites are considered as a group of widely used nanocomposites in industrial applications due to their desired properties, yet reasonable cost. However, dissimmilar chemical nature of polypropylene and clay do not allow perfect dispersion of silicate layeres in the matrix and thus restricts full advantages of these composites.An earlier investigation in this group considered solving this shortcoming through incorporation of PA6 as an intermediate phase to enhance clay platelets dispersion. The current project follows this route via studing the influence of molecular weight of the PP matrix, compatibilzer and the mixing procedure of the compound. To investigate the effect of these parameters on nanostructure of nanocomposites X-Ray diffraction was utilized. Mechanical properties were evaluated via tensile and impact Charpy tests. Differential scanning calorimetry was conducted to investigate the crystallization behavior of the nanocomposites.The results show that the molecular wheight of polypropylene in nanocomposites prepared via different mixing approaches affects nanostructure differently. In addition, introducing compatibilizer disregarding to mixing approach amends clay dispersion. The results of mechanical tests revealed approximately 79% increase in yield stress and 40% in impact strength. Elastic modulus was also improved 18%.

  9. Keywords:
  10. Nanocomposite ; Nanostructure ; Polypropylene ; Polyamides ; Layered Silicate

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