Mmonofunktionelle Silane, die nur Ethoxy-Gruppen oder nur Schwefel-Gruppen tragen, und Silane mit je einer Ethoxy-Gruppe an beiden Silylgruppen wurden synthetisiert. Der Einfluss dieser funktionellen Gruppen auf die mechanischen Eigenschaften von Laufflächenvulkanisaten wurde untersucht und dem von TESPT verglichen. Die Untersuchung zeigt, dass für ein gutes Eigenschaftsprofil von Kieselsäuremischungen beide Funktionalitäten notwendig sind. TESPT war das beste Kupplungsagens, da es sowohl die Primär- und Sekundärreaktionen der Ethoxy-Gruppen mit der Kieselsäure ermöglicht, als auch das Polymer über Schwefelbrücken an die Kieselsäure koppelt.

    Monofunctional coupling agents with only ethoxy groups or only sulphur groups, respectively a coupling agent with only one ethoxy group on each side of the molecule, were synthesised. The effect of these coupling agents on mechanical properties of tire tread vulcanizates was compared to the one of bis-(triethoxysilylpropyl)tetrasulphide (TESPT). The experimental results prove, that a proper balance in functionalities is required for a coupling agent to enhance the properties of silica-reinforced tire tread compounds. TESPT proves to best comply with this balance, because it allows for the primary and secondary coupling reaction towards the silica via its tri-ethoxysilyl groups, resp. for a sulphur donation and a coupling reaction towards the rubber polymer via its sulphur moiety. A coupling agent with only one reactive ethoxy group attached to the silicium atom vs. three for TESPT, performs surprisingly well. This coupling agent can only perform the primary reaction with the silica, which leads to a very quick equilibrium during mixing and consequently low mixer torques. It comes closest to TESPT in vulcanised compound properties, particularly the tan delta at 60 deg C, representative for tire rolling resistance. Only the tensile strength is lower than the one achieved with TESPT.


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    Title :

    Silica reinforced tire tread compounds


    Additional title:

    Eigenschaften kieselsäureverstärkter Laufflächenmischungen


    Contributors:

    Published in:

    Publication date :

    2009


    Size :

    9 Seiten, 12 Bilder, 5 Tabellen, 16 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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