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Synthesis and Characterization of Boron Nitride Composites Based on Bio- and Synthetic Polymers and Investigation of Their Applications

Habibi, Navid | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56338 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Pourjavadi, Ali
  7. Abstract:
  8. In recent years, the crude oil spills in the oceans and the excessive emission of electromagnetic waves in the living environment have threatened human health. Therefore, different methods have been considered to deal with each of these two threats. Recently, the use of polymeric boron nitride composites in the production of crude oil absorbents and electromagnetic wave shieldings has received attention due to its thermal conductivity, thermal and chemical stability. In the first step of this research, superhydrophobic composites of polyurethane sponges were prepared by boron nitride and electrically conductive nanomaterials that had photothermal and electrothermal properties. The results showed that these composites could convert light and electricity into heat in the presence of sunlight or by applying an electric current. By heat conduction from absorbents to crude oil with the help of boron nitride nanoparticles, the viscosity of crude oil decreased and the rate of absorption of crude oil into the pores of the absorbent increased. In the next step, electromagnetic waves shieldings based on cellulose and polyurethane/polyimide nanocomposites were prepared. By adding magnetic nanoparticles, carbon nanomaterials and boron nitride to the polymer substrate, the amount of absorption and reflection of electromagnetic wave from the surface of the composite increased and decreased, respectively. It was also shown that by using graphene oxide as a temperature-responsive material, these absorbers could be produced as smart fire alarm sensors. In general, the composites synthesized in this research had very excellent reproducibility, and chemical, thermal and mechanical stability
  9. Keywords:
  10. Oil Pollution ; Boron-Nitride ; Polyurethane ; Superhydrophobicity ; Oil From Water Separation ; Electromagnetic Absorber ; Polyimide

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