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Experimental and Analytical Study of Warpage Reduction in Polypropylene 3d Printing by using Recycled Silica Nanoparticles

Ebadifard, Mohammad Reza | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56273 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Pircheraghi, Gholamreza; Tavakoli, Rohollah
  7. Abstract:
  8. Creating sustainable development in today's society is essential, and one of the most important elements to achieve this is the phenomenon of recycling. Lead-acid batteries are one of the sources of environmental pollution, and their separators contain 50% recyclable silica nanoparticles. In this research, impurities in these separators were removed using two methods: washing with water and sandblasting. The purity of recycled nanoparticles was 85.5% in the first method and 98% in the second method. In addition to the importance of recycling, finding a suitable use for recycled materials is also critical. FDM 3D printing is a new method of producing parts, but polypropylene is not commonly used due to its high warpage. Recycled silica nanoparticles have been used in this research to reduce the warpage of parts in polypropylene 3D printing. The effect of these nanoparticles on crystalline behavior, mechanical properties, melt fluidity, and polymer heat transfer has also been investigated. Based on the results, the addition of nanoparticles significantly reduces the warpage of polypropylene after printing. Final samples printed with different shapes show an improvement in the quality of the printed surface and a reduction in warpage. Adding nanoparticles increases the crystallization temperature and speed, which affects the dimensional uniformity of the filaments. When nanoparticles washed with water are added, β crystals form in the crystal structure of the polymer, increasing the impact resistance by 340%. The rigidity of the nanocomposite is also increased, and the elastic modulus has increased by 15%. Additionally, the fluidity of the polymer melt is reduced by 25% with the presence of nanoparticles, which improves the quality of the printing surface and reduces oozing during printing. The recyclability of nanocomposites was tested by repeating the melt fluidity index test on the samples. The results showed that the addition of nanoparticles did not have any negative effect on the recyclability of nanocomposites, and they can be recycled. The heat transfer coefficient also increased by 95% with the addition of nanoparticles, which helps to reduce resistance. This increase is probably due to the good distribution and dispersion of particles in the field and crossing the thermal diffusion threshold
  9. Keywords:
  10. Three Dimentional Printing ; Polypropylene ; Heat Transfer Coefficient ; Recycled Nanosilica ; Silica Nanoparticles ; Warpage

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