Reduction of tire rolling resistance has been a major technological challenge. As one of potential solutions for this challenge, material technologies to reduce hysteresis loss of the filled elastomer compounds have been intensively studied. Recent development in this field, especially functionalization of polymer to enhance the polymer-to-filler interaction, is the focus of this study. In order to obtain successful polymers for this purpose, chemistry of polymer synthesis and functional group-to-filler interactions are equally important. Such molecular design has been proven beneficial in tire compounds. However, when commercial viability is concerned, availability of such beneficial elastomer has been almost limited to those made by anionic living polymerization process employing functionalization via carbanion chemistry. Recently, thanks to technological advancements, such molecular design has become available in the field of cis-1,4-polybutadiene (CIS-BR), which is the second most important synthetic elastomer for tire industry next to SBR. In this paper, we will present some examples of synthesis of such end-functionalized CIS-BR applying rare-earth catalysis and unique properties of the resulting polymers in silica-filled compounds. This new polymer not only exhibited significant reduction of hysteresis losses in the silica-filled compound, it also promoted significant increase of silica-bound CIS-BR fraction in uncured state. This behavior has shown well correlated to improvement of wear resistance and much reduced temperature dependence of storage modulus. These properties were not achieved simply by facilitating the filler micro dispersion by, for example, additives that promotes hydrophobation of the silica surface, and found useful in tire applications.


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    Title :

    Recent developments in tire elastomers for reduced rolling resistance


    Contributors:


    Publication date :

    2007


    Size :

    20 Seiten, 11 Bilder, 2 Tabellen, 9 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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