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3D Printing of PVDF Based Polymer Nanocomposites for Piezoelectric and Mechanical Properties

Ali Abed Al-Dulaimi, Hossein | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 57511 (57)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Pircheraghi, Gholamreza; Nemati, Ali
  7. Abstract:
  8. The research focused on developing polyvinylidene fluoride (PVDF) nanocomposites with enhanced piezoelectric and mechanical properties. To achieve this, barium titanate nanoplatelets (BTNPs) were incorporated at varying weight percentages into a PVDF matrix. Fused Deposition Modeling (FDM) 3D printing was employed to control nanoplatelets' orientation, aiming to improve properties. Initially, BTNPs were synthesized using the hydrothermal technique and homogeneously dispersed in a PVDF matrix with an internal mixer. Nanocomposite samples were fabricated using compression molding and analyzed with X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), rheological measurements, Field Emission Scanning Electron Microscopy (FESEM), and Dynamic Mechanical-Thermal Analyses (DMTA). The second step included utilizing FDM 3D printing to control the parameters and promote the orientation of the barium titanate nanoplatelets (BTNPs) in PVDF matrix. The integration of FDM 3D printing with 5% BTNP (PVDF-5) at a 90-degree orientation showed a crystallinity of 78.37% and β-phase content of 45.7%. In contrast, PVDF-10 samples achieved 69.4% crystallinity and 44% β-phase content. The PVDF-5 sample exhibited a maximum unpoled voltage of 995 mV and a current of 0.25 µA, outperforming PVDF-10, which recorded 920 mV and 0.22 µA. Upon poling, PVDF-5 showed increased voltage (2100 mV) and current (0.44 µA), surpassing PVDF-10, which reached 1640 mV and 0.34 µA. PVDF-5 demonstrated a 3.5-fold enhancement over pure PVDF, with a 250% increase in voltage and a 239% rise in current and notable enhancements over PVDF-10 and pure PVDF designed by 3D printing. Tensile tests revealed that the PVDF-5 samples exhibited robust mechanical properties, meeting diverse application requirements
  9. Keywords:
  10. Polyvinylidene Fluoride (PVDF) ; Barium Titanat ; Piezoelectric Peoperties ; Mechanical Properties ; Fused Deposition Modeling (FDM) ; Three Dimentional Printing ; Polymer Nanocomposits

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