The influence of combined active fillers on the properties of elastomeric materials for eco-friendly tyres
Reinforcing of elastomers by the addition of various nanofillers has led to significant improvements in elastomer properties, and therefore, to the increase of potentials for use as suitable materials for special applications. The aim of this study was to investigate the effects of combi...
Main Authors: | , , , , , , |
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Format: | Article |
Language: | English |
Published: |
Association of Chemical Engineers of Serbia
2018-01-01
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Series: | Hemijska Industrija |
Subjects: | |
Online Access: | http://www.doiserbia.nb.rs/img/doi/0367-598X/2018/0367-598X1805293K.pdf |
Summary: | Reinforcing of elastomers by the addition of various nanofillers has led to
significant improvements in elastomer properties, and therefore, to the
increase of potentials for use as suitable materials for special
applications. The aim of this study was to investigate the effects of
combinations of two active fillers (carbon black and synthesized silica
(50/0; 35/15; 25/25; 15/35; 0/50; phr)) on the morphology, curing, as well
as thermal, dynamic-mechanical and mechanical properties of nanocomposites
based on the styrene-butadiene rubber as the network precursor. Based on SEM
results, the largest agglomerates were observed in the structure of the
nanocomposite containing 25 phr of carbon black and 25 phr of SiO2.
Determination of curing characteristics indicated that the minimum torque at
100, 150 and 160°C had higher magnitudes for the compounds with silica
filler, which is in accordance with the tendency of SiO2 to form
filler-filler interactions. Values of the scorch time and the optimal time
of crosslinking increased by increasing the silica phr content in the
fillers mixture. It could be thus supposed that the fraction of occluded and
trapped chains in the structure of elastomer reinforced by SiO2 is higher
due to the almost 2-fold higher value of the silica NDBP number as compared
to the NDBP number of carbon black particles. On the basis of MDSC results,
it was assessed that the addition of combined active fillers had negligible
effects on the glass transition temperature, registered at about -47°C for
all tested samples. The obtained DMA data, concerning storage moduli in the
temperature range from -20 to 0°C, (characteristic for "Payne" effect) are
very significant for predictions of the properties of the tyre tread such as
the slip resistance on the road on ice and in the wet conditions. The
increase of silica content in the combined filler induced a decrease of the
dynamic mechanical loss factor of prepared nanocomposites in the temperature
range from 40 to 80°C. The obtained results are very important for the
structuring of elastomeric materials aimed for production of tyres with
reduced rolling resistance and fuel consumption. The elastomer containing
the highest content of carbon black showed the highest value of the tensile
strength (21.8 MPa). The abrasion resistance of the synthesized
nanocomposites increased as the silica content was reduced in the combined
fillers. [Project of the Serbian Ministry of Education, Science and
Technological Development, Grant no. III 45022] |
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ISSN: | 0367-598X 2217-7426 |