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Studying the Effects of Sintering Parameters on the Microstructure and Properties of Porous Polymeric Products

Salari, Meysam | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49730 (07)
  4. University: Sharif University of Technology
  5. Department: Characterization and Material Selection
  6. Advisor(s): Pircheraghi, Gholamreza
  7. Abstract:
  8. Nowadays filtration process is increasingly used in various areas such as water purification, food industries, filtering the air dust and other separation applications. In this work, the HDPE microporous filters have been fabricated at different temperature, pressure and time conditions via sintering process and then were characterized by different techniques. It can be expected that microstructure and mechanical properties of the samples could be controlled by changing the fabrication parameters of the process and also by changing the properties of the resin such as powder shape, particle size and rheological properties. In the first step, by using DSC, MFI, rheology test and optical microscope, the most suitable polymeric powder for sintering process was chosen and then, the melt coalescence rate of polymeric particles was followed using an optical microscope equipped with a hot stage. Based on the DSC results, the sintering temperature was fixed in the vicinity of melting temperature of the used HDPE powder. In order to evaluate mechanical properties and porosity of the samples, the results obtained from the shear punch test, acetone drop permeability, gas permeability, transition optical microscopy and SEM, have been used. This study has demonstrated that the sintering process can be used for fabrication of a wide range of microstructures with different porosities and by precisely controlling the sintering kinetics, achievement of desirable microstructures is possible. Finally, the sample which is sintered at 128oC, for 210 minutes and under the pressure 73 KPa, revealed the optimized properties through balancing shear strength and permeability
  9. Keywords:
  10. Filtration ; High Density Polyethylene ; Sintering ; Permeability ; Porous Product ; Microstructure

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