Elastomeric Nanocomposites for Tyre Applications
ABSTRACT In this study the epoxidized natural rubber (ENR) and organoclay (Cloisite 20A) composites were prepared by solution mixing
process. The obtained nanocomposites were incorporated in natural rubber (NR) and styrene butadiene rubber (SBR) blends in
presence of varying types of carbon black as reinforcing fillers. Morphology, curing characteristics, mechanical and thermal
properties were characterized and analyzed. Also, the wear characteristics of the nanocomposites against Du-Pont and DIN abrader
were determined and discussed. The morphology of the organoclay incorporated in ENR shows a highly intercalated structure.
ISAF type of carbon black shows a significant effect on curing and mechanical properties by reacting at the interface between
SBR and NR matrix. Blends containing ISAF N234 type of carbon black shows high abrasion resistant properties against Du-Pont
and DIN abrader.
- SourceAvailable from: Philippe Dubois[show abstract] [hide abstract]
ABSTRACT: This review aims at reporting on very recent developments in syntheses, properties and (future) applications of polymer-layered silicate nanocomposites. This new type of materials, based on smectite clays usually rendered hydrophobic through ionic exchange of the sodium interlayer cation with an onium cation, may be prepared via various synthetic routes comprising exfoliation adsorption, in situ intercalative polymerization and melt intercalation. The whole range of polymer matrices is covered, i.e. thermoplastics, thermosets and elastomers. Two types of structure may be obtained, namely intercalated nanocomposites where the polymer chains are sandwiched in between silicate layers and exfoliated nanocomposites where the separated, individual silicate layers are more or less uniformly dispersed in the polymer matrix. This new family of materials exhibits enhanced properties at very low filler level, usually inferior to 5wt.%, such as increased Young’s modulus and storage modulus, increase in thermal stability and gas barrier properties and good flame retardancy.Materials Science and Engineering: R: Reports. 01/2000; 28(1-2):1-63.
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ABSTRACT: Epoxidized natural rubber (ENR)-layered silicate composites were produced by melt compounding and sulfur curing. Pristine (sodium bentonite and sodium fluorohectorite) and organophilic modified silicates (organoclays with primary amine and quaternary ammonium modifications) were introduced in 10 parts per hundred rubber (phr) in the recipes and their effect on the curing and (thermo)mechanical properties determined. The dispersion state of the silicates was studied by X-ray diffraction and transmission electron microscopy. Fastest curing and best mechanical properties were found for the ENR containing the organoclay with primary amine modification. This organoclay was partly exfoliated, partly intercalated and partly confined (reaggregated). Due to the high shearing during compounding the pristine fluorohectorite was also intercalated by ENR. The complex dispersion state of the layered silicates was well reflected in the glass transition relaxation, which showed multiple peaks. Intercalation/exfoliation of the silicates were best displayed in stiffness- and strength-related mechanical parameters.Polymer. 01/2003;
Article: Abrasion of rubber by a needle[show abstract] [hide abstract]
ABSTRACT: A detailed study has been made of the scratches produced by a needle on natural rubber vulcanizates of different composition. The surface damage brought about in this way depends markedly on the nature of the rubber. In particular, the traces on unloaded vulcanizates are discontinuous whereas the traces on carbon loaded rubbers of the tire tread type are continuous. It has been found possible to explain the results qualitatively by reference to hardness, friction, and tear resistance of the vulcanizates.Journal of Polymer Science 03/2003; 9(5):385 - 404.