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GTR/NBR/Silica Composites Performance Properties as a Function of Curing System: Sulfur versus Peroxides

1
Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland
2
Department of Chemical Engineering, Universitat Politècnica de Catalunya Barcelona Tech, Colom 1, Terrassa, 08222 Barcelona, Spain
*
Authors to whom correspondence should be addressed.
Academic Editor: Michal Sedlačík
Materials 2021, 14(18), 5345; https://doi.org/10.3390/ma14185345
Received: 3 August 2021 / Revised: 31 August 2021 / Accepted: 13 September 2021 / Published: 16 September 2021
In this work, conventional sulfur and two types of organic peroxides (dicumyl peroxide (DCP) and di-(2-tert-butyl-peroxyisopropyl)-benzene (BIB)) curing systems were used to investigate the possibility for tailoring of the performance properties of GTR/NBR blends reinforced with a variable content of highly dispersive silica (0–30 phr). The curing characteristics, static mechanical and acoustical properties, swelling behavior, thermal stability, and microstructure of the prepared composites were investigated. The results show that regardless of the curing system used, increasing the content of highly dispersive silica resulted in the improvement of the mechanical properties of the studied materials. It was observed that sulfur-based systems are the best choice in terms of cross-linking efficiency determined based on torque increment and cross-link density parameters. However, further analysis of the physico-mechanical properties indicated that the cross-linking efficiency does not match the performance of specimens, and the materials obtained using organic peroxides show higher tensile properties. This is due to the improved physical interactions between the GTR/NBR matrix and highly dispersive silica when using peroxide systems. It was confirmed using the analysis of the Wolff activity coefficient, indicating the enhanced synergy. View Full-Text
Keywords: recycling; ground tire rubber; composites; curing system; structure-property relationship recycling; ground tire rubber; composites; curing system; structure-property relationship
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MDPI and ACS Style

Zedler, Ł.; Colom, X.; Cañavate, J.; Formela, K. GTR/NBR/Silica Composites Performance Properties as a Function of Curing System: Sulfur versus Peroxides. Materials 2021, 14, 5345. https://doi.org/10.3390/ma14185345

AMA Style

Zedler Ł, Colom X, Cañavate J, Formela K. GTR/NBR/Silica Composites Performance Properties as a Function of Curing System: Sulfur versus Peroxides. Materials. 2021; 14(18):5345. https://doi.org/10.3390/ma14185345

Chicago/Turabian Style

Zedler, Łukasz, Xavier Colom, Javier Cañavate, and Krzysztof Formela. 2021. "GTR/NBR/Silica Composites Performance Properties as a Function of Curing System: Sulfur versus Peroxides" Materials 14, no. 18: 5345. https://doi.org/10.3390/ma14185345

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