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Preparation of Nanocomposites based on Poly (Lactic Acid)/Nano-Diamond

Esfandiari, Atene | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49530 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Forounchi, Masoud
  7. Abstract:
  8. Nanodiamond (ND)/polylactic acid (PLA) nanocomposites have the potential for biomedical applications and bone tissue engineering. In this research, nanodiamond/poly lactic acid nanocomposites were prepared by mechanical mixing solution method and applying ultrasonication. Also, PLA-based nanofiber scaffold reinforced by nanodiamond were prepared by electrospinning methods. To find the optimum value of parameters to prepare this nanocomposite sample, the effect of nanofiller concentration, mixing rate and duration, the role of solute and ultrasonication, and solvent evaporation conditions were investigated and then it compared to the neat polylactic acid sample. By means of Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction, Scanning electron microscopy (SEM) and Differential Scanning Calorimetry (DSC), the ND/PLA nanocomposites were investigated, and thus the effect of nanodiamond on the mechanical and structural properties of polylactic acid has been demonstrated. Experimental results showed that, as nanodiamond was incorporated to the PLA matrix, the mechanical properties of polylactic acid matix were improved. For example by applying 1wt% of nanofiller, the tensile modulus increased 40% and the ultimate strength incread 24%. The initial melting point was delayed 10 0C compared to the neat PLA. Moreover, DSC results showed 4% growth in the crystalinity of the polymer matrix.These improvements could be ascribed to the unique physical properties of nanodimond, its homogeneous dispersion in the matrix, and good adhesion between nanodiamond and PLA matrix in nanodimand/poly lactic acid nanocomposites
  9. Keywords:
  10. Polylactic Acid ; Nanodiamond ; Nanocomposite ; Electrospinning ; Mechanical Properties ; Nanofibrous Scaffold

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