Improvements of Nanofiller-Elastomer Systems by Filler Modification and Tailored Mixing Techniques
|Kustantaja||Tampere University of Technology|
|Tila||Julkaistu - 12 lokakuuta 2017|
|Nimi||Tampere University of Technology. Publication|
The objective of this thesis was to study the ability of the new filler systems to tailor the properties of elastomeric materials for applications requiring good mechanical and dynamic properties, in this case tyre tread. The experiments were performed by replacing the small amounts of carbon black by layered silicates, halloysite nanotubes and carbon nanotubes. The effect of replacement on the dispersion of the filler system and on the vulcanization, mechanical and dynamic properties of rubber was analysed. The approach was to improve the compatibility of filler and polymer by the surface modification of nanofillers.
It was observed that the partial replacement of very reinforcing carbon black by the nanofillers using traditional mixing techniques has only minor effect on the mechanical properties of rubber. Therefore, nanoclays and carbon nanotubes have a comparable reinforcing effect to carbon black, but additionally the partial replacement of carbon black by those reduces stiffness and improves dynamic properties such as the loss factor of rubber. Moreover, it was found that a blend of two fillers improves the dispersion and distribution of fillers, and that, with these hybrid fillers, sufficient dispersion of nanofiller loadings up to 5 phr can be achieved by traditional mixing methods. Masterbatch mixing is a way to facilitate the dispersion of carbon nanotubes and to prevent health and environmental risks possible during the mixing of nanoparticles.