Authors Vaikuntam, S. R. ; Bhagavatheswaran, E. S. ; Stöckelhuber, K.W. ; Wießner, S. ; Heinrich, G. ; Das, A.
Title Development of high performance rubber composites from alkoxide-based silica and S-SBR. - Part 1 and Part 2
Date 08.10.2018
Number 55843
Abstract Solution styrene butadiene rubber (S-SBR) and silica-based composites are prepared by hydrolysis of tetraethylorthosilicate (TEOS) in presence of an organic solution of styrene butadiene rubber and n-butylamine as catalyst. Addition of bis[3-(triethoxysilyl)propyl]tetrasulfide (TESPT), a silane coupling agent, improves the performance and properties of the composites. All the results are compared with composites containing commercial precipitated silica at similar loading. Part 1 describes the investigation of silica flocculation and filler network analysis as well as the rheometric analysis. The silica particles generated from this alkoxide route result in lower Mooney viscosity of the compound and show less filler flocculation compared to standard commercial precipitated silica in reference compounds. In part 2, a detailed dynamic mechanical study indicates that alkoxide silica in model tire compounds could offer a lower rolling resistance and a higher wet skid resistance compared to the reference. Other properties such as heat build-up, rebound resilience and hysteresis loss are found to be very promising for alkoxide silica composites, too. The silica particles (aggregated) developed by the alkoxide method are found to be relatively large, in the range of 150 nm to 200 nm, as compared to the primary particles of precipitated commercial silica. The synthesis of sol-gel silica particles in presence of the polymer allows to trap some polymer molecules inside the filler aggregates and, therefore, offers exceptional mechanical reinforcement of the rubber.
Publisher RFP-Rubber Fibres Plastics International
Citation RFP-Rubber Fibres Plastics International 13 (2018) 3, 201-215 + 4, 210-216

Back to list