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Preparation and Characterization of Morphology and Mechanical Properties of PA6/Nanodiamond Composites

Karami, Pooria | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48078 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shojaei, Akbar
  7. Abstract:
  8. Polyamide or Nylon, due to its remarkable mechanical and tribological properties, has many engineering applications. Hence, improving the properties can develop the polyamide applications. In this study, Polyamide 6 (PA6) has been used as matrix with nanodiamond (ND) reinforcement. Spherical shape, chemically active surface as well as remarkable mechanical properties make nanodiamond an ideal candidate for improving polymers properties. Poor dispersion and agglomeration are present however major problems in achieving improved properties in nanocomposites. To deal with this problem, nanodiamonds were surface modified using Ethylenediamine (EDA) and Hexamethylenediamine (HMD). Nanocomposite samples were prepared by melt mixing at three weight fractions of 0.25, 0.5 and 1% for carboxylated nanodiamonds, and 0.25% wt. for diamine modified nanodiamonds. Based on microscopic images, it was observed that surface modification with Ethylenediamine improves nanodiamond dispersion in the polymeric matrix. DSC analysis showed that the degree of crystallinity and also α-crystalline form increase with an increase in nanodiamond loading. Based on the obtained results from tensile tests, the elastic modulus and tensile strength for PA6/ND-COOH nanocomposite at 0.25 wt% loading are appreciably enhanced. Nonetheless, the tensile properties decrease at higher concentration of carboxylated nanodiamonds, mainly due to nanoparticle agglomeration and less uniform dispersion. Nanocomposite with EDA modified NDs exhibits the highest elastic modulus by 27.3%. Moreover, the results obtained from impact tests indicate an improvement in impact strength for nanocomposites with EDA modified NDs and nanocomposites with carboxylated NDs at lower weight fractions. The wear tests were conducted showing a decrease in coefficient of friction and specific wear rate with increasing nanodiamond weight fraction and also after diamine surface modification
  9. Keywords:
  10. Nanocomposite ; Polyamide 6 ; Nanodiamond ; Mechanical Properties ; Tribological Properties

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