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An Investigation on the Role of Silica Hybrid Nanoparticles on the Properties of Styrene Butadiene Rubber (SBR)

Mohammadi, Ali | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54910 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shojaei, Akbar; Salkhi Khasraghi, Samaneh
  7. Abstract:
  8. Hybrid nanoparticle comprising of nanosilica (NS) and nanodiamond (ND), as denoted by ND@NS, was synthesized by a two-step chemistry route and then incorporated into styrene-butadiene rubber (SBR) at low concentrations up to 5 phr by a two-roll mill. Physical hybrids of NS and ND, i.e., ND&NS, with a weight ratio similar to chemical hybrid (80:20 for NS:ND), were also incorporated into SBR. Field emission scanning electron microscopy observations revealed very fine dispersion of nanoparticles in the case of physical hybrids (ND&NS); whereas, agglomerations and aggregation of nanoparticles were evidenced for ND@NS. Tensile and dynamic mechanical analyses exhibited a higher reinforcing effect of hybrid nanoparticles with respect to single nanoparticles; however, ND&NS showed even better performance compared with ND@NS due to better filler-rubber interaction caused by improved filler dispersion. So, tensile strength, elastic modulus, and elongation at break of unfilled SBR increased about 23%, 40%, and 110%, respectively, in the case of ND&NS. It was also realized that incorporation of ND@NS and ND&NS enhanced the thermal conductivity of SBR around 46% and 31%, respectively
  9. Keywords:
  10. Nanosilica ; Nanodiamond ; Rubber ; Thermal Conductivity ; Styrene-Butadiene Rubber (SBR) ; Hybrid Nanoparticles

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