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International Journal of Automotive Technology > Volume 24(4); 2023 > Article
International Journal of Automotive Technology 2023;24(4): 983-994.
doi: https://doi.org/10.1007/s12239-023-0080-z
MICROMECHANICS MODEL FOR RUBBER BLENDS FILLED BY A NANO-REINFORCED DEVULCANIZED RECYCLED RUBBER: APPLICATION IN THE AUTOMOTIVE INDUSTRY
Seyed Kamal Jalali 1, James Busfield 2, Nicola Pugno 1,2
1Laboratory for Bioinspired, Bionic, Nano, Meta Materials & Mechanics, Department of Civil, Environmental and Mechanical Engineering, Università di Trento
2School of Engineering and Materials Science, Queen Mary University of London
PDF Links Corresponding Author.  Nicola Pugno  , Email. nicola.pugno@unitn.it
ABSTRACT
The present report proposes a micromechanics model for predicting the dynamic modulus of rubber blends consisting of a base rubber and devulcanized recycled rubbers reinforced by nanofillers. A four-step hierarchical homogenization is established to relate the properties of components from the nano-sized reinforcements to the macro-scaled final blend. The developed model accounts for the effect of agglomeration and geometry of nano-fillers, the quality of the devulcanization process, and the properties of the interphase surrounding the nanofillers on the dynamic modulus of the rubber blend. A comprehensive dimensionless parametric study is performed whose output in terms of graphical maps can be used as a design guideline for practical cases in industries like automotive. A case study for recycled end-of-life tires (ELTs) reinforced by nano clays is presented and it is found that the nano reinforcement of devulcanized rubbers has a remarkable potential to compensate for the weakness compared to its virgin counterpart.
Key Words: Nano reinforcement, End-of-life tires (ELTs), Devulcanization, Recycled rubber, Halpin-Tsai (H-T)
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