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Effect of Carbon Nanoparticle Hybrid on the Properties of Styrene-Butadiene Rubber (SBR)

Jafarpour, Erfan | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51642 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shojaei, Akbar
  7. Abstract:
  8. Flexible polymers (elastomers) are especially suitable for dynamic applications, and carbon fillers are well-known filler for elastomers. These are widely used in elastomer matrices for various commercial applications. Some of carbon nano fillers like Nano Diamond cannot impart such high degree of reinforcement to polymer matrices mainly because of improper filler dispersion and lack of strong filler-polymer interaction. In this effort, we examine the effects of two different nanostructured carbons when they are incorporated in a rubber matric in terms of mechanical, thermal and electrical properties of the nanocomposites. Different ingredients and hybrid nanofillers were added to matric by mechanical mixing in an internal mixer. The isothermal cure of compounds was studied at 150 ˚C temperatures using a MDR type rheometer. Mechanical properties were evaluated by stress-strain measurements at room temperature. Bound rubber percentage was estimated through chemical method by immersing uncured samples in toluene. Electrical conductivity was measured by a Keithley picoammeter 486 Thermal conductivity across the samples determined by standard methods. Uniform distribution of fillers in the composites was studied by Field Emission Scanning Electron Microscopy (FE-SEM). According to the results, hybrid nanocomposites have shown uniform distribution of fillers. These nanocomposites exhibited better electrical resistivity than carbon nanotube nanocomposites and better mechanical behavior than nanodiamonds. The most important result of this study is the observation of the synergistic effect in thermal properties of the hybrid nanocomposite.It is shown that the "K" value improves from 0.13 W/m.K for neat SBR to 0.3 W/m.K for 5 phr hybrid CNT/ND nanocomposites
  9. Keywords:
  10. Styrene-Butadiene Rubber (SBR) ; Nanodiamond ; Carbon Nanotubes ; Synergistic Effect ; Heat Conduction ; Electrical Conductivity ; Elastomer Materials

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