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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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New Route of Tire Rubber Devulcanization Using Silanes
Rounak Ghosh1, Christian Mani2, Roland Krafczyk2
1Department of Solids, Surfaces and Systems, Faculty of Engineering Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Polymers
|July 14, 2023
Summary
This study introduces a sustainable devulcanization process for tire rubber using silanes. The method achieves significant network breakdown and strength recovery, offering an eco-friendly recycling solution.
Area of Science:
- Materials Science
- Sustainable Chemistry
- Polymer Recycling
Background:
- Tire disposal poses environmental challenges, necessitating effective recycling solutions.
- Devulcanization offers a sustainable approach by breaking rubber crosslinks while preserving polymer chains.
- Silanes are promising devulcanization aids due to their established role in tire manufacturing.
Purpose of the Study:
- To develop a sustainable devulcanization process for passenger car tire rubber.
- To evaluate the efficacy of silanes as devulcanization aids.
- To assess the properties of devulcanized and re-vulcanized rubber.
Main Methods:
- A thermo-mechanical-chemical devulcanization process was employed.
- Six potential devulcanization aids (DAs), focusing on silanes, were screened.
- Devulcanization efficiency was measured by network breakdown, material miscibility, and mechanical properties.
Main Results:
- Achieved 55-60% network breakdown in the devulcanized rubber.
- Demonstrated 50-55% tensile strength recovery compared to the original rubber.
- Identified silanes as efficient and safe devulcanization aids.
Conclusions:
- The developed silane-based devulcanization process is highly efficient and sustainable.
- Devulcanized rubber is suitable for high-performance applications like tires and seals.
- This method provides an environmentally compliant alternative to conventional devulcanization agents.
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