RT info:eu-repo/semantics/article
T1 Setting relationships between structure and devulcanization of ground tire rubber and their effect on self-healing elastomers
A1 Pastor Barajas, José María
A1 Alonso Pastor, Luis Eduardo
A1 Nuñez Carrero, Karina Carla
A1 Araujo Morera, Javier
A1 Hernández Santana, Marianella
K1 Reciclaje (Residuos, etc.)
K1 Mechanics
K1 End-of-life tires (ELTs)
K1 Ground tire rubber (GTR)
K1 Grinding process
K1 Devulcanization
K1 Neumáticos fuera de uso (ELT)
K1 Caucho de neumáticos molido (GTR)
K1 Proceso de trituración
K1 Desvulcanización
K1 2210.28-1  Preparación y Caracterización de Materiales Inorgánicos
AB The use of devulcanized tire powder as an effective reinforcement in self-healing styrene-butadiene rubber (SBR) compounds has been investigated for the first time in this work. For this purpose, the evolution of the microstructure of the rubber from end-of-life tires (ELTs) was studied during granulation, grinding and devulcanization through an exhaustive characterization work in order to relate the final microstructure with the mechanical response of the repaired systems. Different morphologies (particle size distribution and specific surface area) obtained by cryogenic and water jet grinding processes, as well as different devulcanization techniques (thermo-mechanical, microwave, and thermo-chemical), were analyzed. The results demonstrated the key influence of the morphology of the ground tire rubber (GTR) on the obtained devulcanized products (dGTR). The predictions of the Horikx curves regarding the selectivity of the applied devulcanization processes were validated, thereby; a model of the microstructure of these materials was defined. This model made it possible to relate the morphology of GTR and dGTR with their activity as reinforcement in self-healing formulations. In this sense, higher specific surface area and percentage of free surface polymeric chains resulted in better mechanical performance and more effective healing. Such a strategy enabled an overall healing efficiency of more than 80% in terms of a real mechanical recovery (tensile strength and elongation at break), when adding 30 phr of dGTR. These results open a great opportunity to find the desired balance between the mechanical properties before and after self-repair, thus providing a high technological valorization to waste tires.
PB MDPI
YR 2021
FD 2021
LK https://uvadoc.uva.es/handle/10324/59093
UL https://uvadoc.uva.es/handle/10324/59093
LA eng
NO Polymers, 2022, vol. 14, n. 1, 11
NO Producción Científica
DS UVaDOC
RD 08-feb-2025