- Title
- The effect of waste tyre pyrolysis-derived carbon black on the various properties of natural rubber/styrene-butadiene rubber blends
- Creator
- Ketelo, Sisonke
- Subject
- Rubber chemistry
- Subject
- Rubber Polymers
- Date Issued
- 2020
- Date
- 2020
- Type
- Thesis
- Type
- Masters
- Type
- MSc
- Identifier
- http://hdl.handle.net/10948/49115
- Identifier
- vital:41602
- Description
- Disposal of waste tyres into landfills is common in developing countries, including South Africa. This behaviour is detrimental to human health as well as other living organisms and the environment itself. There are several recycling methods and processes that have been adopted in various countries to mitigate the situation. These include the recovery of materials such as rubber for re-use; shredding of tyres into small crumb particles for secondary applications in various industries such as civil engineering and the automotive sector; and commonly through heating tyres under a controlled environment to produce oil in a process called pyrolysis. The latter is of interest to the study, with a specific interest in valorization of the process’ resultant char/pyrolysis carbon black. In principle, this study considers the advancement of waste tyre material recovery by finding applications for pyrolysis-derived carbon black (pCB) recovered from waste tyres as it is one of the significant products of pyrolysis. The study involved investigating the effectiveness of pyrolysis-derived carbon black in its ability to improve the properties of natural rubber/styrene-butadiene rubber blends for the conveyor belting industry and other related industries. The pyrolysis-derived carbon black was characterized and compared to commercial grades of carbon blacks on properties such as surface area, thermal stability, heat absorption, structure and morphology using various laboratory techniques such as XRD, XRF, TGA, BET, DSC and SEM. It was found that the properties of the unmodified pCB closely matched those of commercial carbon black grade N660. Through internal mixing, rubber compounds were prepared using 40 phr of pCB and of the selected carbon black grades. Improvements were observed in the mechanical properties of the polymer for application specifications, especially tensile properties and abrasion resistance. Pyrolysis-derived carbon black improved tensile properties to a similar magnitude as a reinforcing carbon black grade and produced similar cure times. Partial replacement of a commercial carbon black grade with pCB of 5 to 20 phr in NR/SBR yielded intermediate results. The unmodified pCB can be used to improve the physical properties of natural rubber/styrene-butadiene rubber blends because it exhibits filler behaviour.
- Format
- xv,108 leaves
- Format
- Publisher
- Nelson Mandela University
- Publisher
- Faculty of Science
- Language
- English
- Rights
- Nelson Mandela University
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| Thumbnail | File | Description | Size | Format | |||
|---|---|---|---|---|---|---|---|
| View Details Download | SOURCE1 | Ketelo, S.pdf | 4 MB | Adobe Acrobat PDF | View Details Download |