An Investigation into the Mechanisms for Styrene-Butadiene Copolymer (SBR) Conversion in Combustion and Gasification Environments
Abstract
The thermal degradation (pyrolysis and combustion) of styrene-butadiene rubber has been studied thermo-gravimetrically using various heating rates (10, 20, 30, 40 K/min) and various atmospheres (pure N2, 3% H2/N2, air, 30% O2/N2). Calculation of apparent kinetic parameters pre-exponential factor, activation energy and reaction order for the different conditions was done to enable modeling efforts. Gas phase chemical species measurement provides some insight into the possible degradation mechanisms and is explained. The outcome of the experiments show under gasification there is a single reaction mechanism occurring whereas in a combustion environment a two-stage reaction sequence (primary and secondary) is present at the tested heating rates. The primary reaction exhibits a thermal degradation that follows diffusion of oxygen to the surface, followed by gas phase oxidation, while the secondary reaction is more representative of a heterogeneous decay mechanism. Testing in a hydrogen-spiked atmosphere, surprisingly, did not have a significant effect on the gasification rates of SBR. In addition, this atmosphere resulted in a carbon residual that remained in the sample crucibles, something that was not observed in other atmospheres, including nitrogen.
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Decomposition of SBS occurs by a free-radical mechanism according to scission of the polymer.
“It can be found that the decomposition of SBS occurs by a free-radical mechanism according to the scission of the polymer.66,67”
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Self-citationGopinath, S., Adarsh, N. N., Nair, P. R., & Mathew, S. (2021) · ACS Omega · doi:10.1021/acsomega.0c05839 · Cited by 39 · see citing works
- Authors
- Castaldi, M. J., & Kwon, E.
- Affiliations
- Columbia University (US)
- Corresponding author
- Castaldi, Marco J.
- Venue
- International Journal of Green Energy
- Publisher
- Informa UK Limited
- Published
- 2007-01-12
- Volume
- 4
- Issue
- 1
- Pages
- 45-63
- ISSN
- 1543-5075 (ISSN-L)
- 1543-5083
- OpenAlex
- W2158691224
- Cited by
- 23
- References
- 34
- Citations by year
- 2026: 1 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 5 · 2018: 1 · 2016: 1 · 2015: 1 · 2013: 1 · 2012: 1
- FWCI
- 1.29
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- International Journal of Green Energy (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Thermal and Kinetic Analysis
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Advanced Combustion Engine Technologies
- Keywords
- styrene-butadiene rubber, thermal degradation, pyrolysis, combustion, gasification, degradation kinetics, activation energy, reaction mechanism, oxygen diffusion, gas-phase oxidation, hydrogen atmosphere, unburned carbon, waste tire recycling
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