3 years ago

Correlation of silane grafting density with rheological properties of silica filled rubber: Coupling of flow and temperature

Correlation of silane grafting density with rheological properties of silica filled rubber: Coupling of flow and temperature
The structure and rheological properties of butadiene rubber / silica / silane nanocomposites were investigated in this paper. The structure of the nanocomposites was characterized by NMR analysis which allowed the quantification of silane grafting rates. A time temperature equivalence parameter was defined as a unique mixing conditions parameter taking into consideration both temperature and mixing speed. A direct law between grafting rates and mixing conditions was found. Rheological properties were characterized by creep and elongation measurements, and the influence of mixing speed and temperature on these properties was determined. A competition between grafting and breaking mechanisms on elastic entities, respectively promoted by the increase of temperature and of speed, was highlighted. Therefore this paper shows correlations between temperature and speed process conditions, the mixture’s structure and its rheological properties. Thanks to these results, a model of the structure of the silica-filled rubber was proposed; unusual rheological properties stem from the formation of clusters of connected aggregates by way of grafted rubber.

Publisher URL: www.sciencedirect.com/science

DOI: S0014305717304901

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