Devulcanization of Scrap Tire Rubber with Supercritical CO2: A Study of the Effects of Process Parameters on the Properties of Devulcanized Rubber
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M. Meysami
, C. Tzoganakis , P. Mutyala , S. H. Zhu and M. Bulsari
Abstract
A continuous extrusion devulcanization process has been developed by using supercritical CO2. Experiments have been carried out on an industrial scale twin screw extruder to study the effects of processing conditions on the properties of devulcanized rubber. Using a fractional factorial design in three levels, the effects of process temperature, screw speed, and feed rate on the sol fraction, degree of devulcanization, Mooney viscosity, and tensile properties of devulcanized rubber have been investigated. The significance of the effects of the processing conditions decreases in the following order: flow rate, screw speed, and process temperature. Similar trends are noted for different responses with the exception of tensile properties. The observed relationship between the sol fraction and the degree of crosslinking in the rubber samples before and after devulcanization points to a highly selective disruption of the sulfur crosslinks in the rubber network during devulcanization rather than a random network scission. Mooney viscosity has been found to be in excellent agreement with the network structure properties, sol fraction, and degree of devulcanization.
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© 2017, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Regular Contributed Articles
- Swelling Properties and Environmental Responsiveness of a Superabsorbent Composite Microsphere Based on Starch-g-Poly(acrylic acid)/Organo-Mordenite
- Study on Permeability of Porous Ultra-High Molecular Weight Polyethylene (UHMWPE)
- Precise Fabrication of Fresnel Flash Lens Featured with V-Grooved Microstructures
- Ion Etching Induced Surface Patterns of Blend Polymer (Poly Ethylene Glycol – Poly Methyl Methacrylate) Irradiated with Gamma Rays
- Devulcanization of Scrap Tire Rubber with Supercritical CO2: A Study of the Effects of Process Parameters on the Properties of Devulcanized Rubber
- Forming of Thermoplastic Matrix Composites with Gas Pressure – the Influence of Blank Holder and Sheet Temperature on the Forming Pressure and Drawing Ratio
- Time Dependence of Morphology and Mechanical Properties of Injection Molded Recycled PET
- A Generalized 2D Output Model of Polymer Melt Flow in Single-Screw Extrusion
- Flow Behavior of PP-Polymer Nanocomposites in Capillary and Injection Molding Dies
- A Recollection with Respect to Flow Induced Crystallization in Polymer Melt Processing
- Optical Properties of HDPE in Injection Molding and Injection Press Molding for IR System Lenses Part II: Mold Temperature and Surface Roughness Effects on Injection Molding
- Modeling Temperature and Time Dependence of the Wetting of Tool Steel Surfaces by Polymer Melts
- Modification Induced by Gamma Irradiation in Polystyrene/Poly(methyl methacrylate) Blends
- Rapid Communications
- Study on the Influence of Extrusion Temperature and Extrusion Die on the Properties of Self-Reinforced PP Sheets
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
Articles in the same Issue
- Contents
- Contents
- Regular Contributed Articles
- Swelling Properties and Environmental Responsiveness of a Superabsorbent Composite Microsphere Based on Starch-g-Poly(acrylic acid)/Organo-Mordenite
- Study on Permeability of Porous Ultra-High Molecular Weight Polyethylene (UHMWPE)
- Precise Fabrication of Fresnel Flash Lens Featured with V-Grooved Microstructures
- Ion Etching Induced Surface Patterns of Blend Polymer (Poly Ethylene Glycol – Poly Methyl Methacrylate) Irradiated with Gamma Rays
- Devulcanization of Scrap Tire Rubber with Supercritical CO2: A Study of the Effects of Process Parameters on the Properties of Devulcanized Rubber
- Forming of Thermoplastic Matrix Composites with Gas Pressure – the Influence of Blank Holder and Sheet Temperature on the Forming Pressure and Drawing Ratio
- Time Dependence of Morphology and Mechanical Properties of Injection Molded Recycled PET
- A Generalized 2D Output Model of Polymer Melt Flow in Single-Screw Extrusion
- Flow Behavior of PP-Polymer Nanocomposites in Capillary and Injection Molding Dies
- A Recollection with Respect to Flow Induced Crystallization in Polymer Melt Processing
- Optical Properties of HDPE in Injection Molding and Injection Press Molding for IR System Lenses Part II: Mold Temperature and Surface Roughness Effects on Injection Molding
- Modeling Temperature and Time Dependence of the Wetting of Tool Steel Surfaces by Polymer Melts
- Modification Induced by Gamma Irradiation in Polystyrene/Poly(methyl methacrylate) Blends
- Rapid Communications
- Study on the Influence of Extrusion Temperature and Extrusion Die on the Properties of Self-Reinforced PP Sheets
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts