Cross-Linked Density Determination of Natural Rubber Compounds by Different Analytical Techniques

This paper investigated the formation of crosslinks in natural rubber compounds in the vulcanization systems: conventional (CV), semi-efficient (SEV), and efficient (EV), processed with three types of accelerators: MBTS (dibenzothiazole disulfide), TMTD (tetramethylthiuram disulfide) and CBS (n-cycl...

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Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2021-01, Vol.24 (suppl 1), p.1
Main Authors: Hiranobe, Carlos Toshiyuki, Ribeiro, Gabriel Deltrejo, Torres, Giovanni Barrera, Reis, Elton Aparecido Prado dos, Cabrera, Flávio Camargo, Job, Aldo Eloizo, Paim, Leonardo Lataro, Santos, Renivaldo José dos
Format: Article
Language:English
Subjects:
Accelerators
cross-linked density
Crosslinking
Density
Dynamic mechanical analysis
ENGINEERING, CHEMICAL
Flory-Rehner
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
Mooney-Rivlin
Natural rubber
NMR
Nuclear magnetic resonance
Strain
Vulcanization
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Summary:This paper investigated the formation of crosslinks in natural rubber compounds in the vulcanization systems: conventional (CV), semi-efficient (SEV), and efficient (EV), processed with three types of accelerators: MBTS (dibenzothiazole disulfide), TMTD (tetramethylthiuram disulfide) and CBS (n-cyclohexyl 2-benzothiazole sulfenamide). The cross-linked densities were determined by organic solvent swelling, dynamic mechanical analysis (DMA), stress vs strain, and low-field nuclear magnetic resonance, the latter being the reference technique for comparison with the other results. It was found that the choice of accelerator type influences the processing time and the cross-linked density of the vulcanizate. The four techniques showed close values of cross-linked density for natural rubber compounds, demonstrating that the analytical techniques studied can be applied to determine cross-linked density.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2021-0041