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A rheological method for selecting nano-kaolin powder as filler in sBR rubber

particuology 2010年第3期8卷 245-250页

作者： Alberto Lagazzo sergio Lenzi Rodolfo Botter paolo Cirillo Fabrizio Demicheli Dario T. Beruto Department of Civil Environmental and Architectural Engineering (DICAT) University of Genoa P.le Kennedy (Fiera del Mare) Pad. D 16129 Genoa Italy artigo s.p.a. loc. Carpeneto 17014 Cairo Montenotte (SV) Italy

This paper shows that the stiffness ofstyrene-butadiene solid rubber with added kaolin powder is related to the yield stress of kaolin dispersion in liquid polybutadiene rubber up to the percolation threshold. For five kinds of kaolin powder, the value of τ° spans the range of 100-430 pa, while the corresponding compressive elastic constant of sBR varies from 12 to 21 Mpa. A relationship between τ° and △E^i^＊/ER^＊ is proposed. Critical examination of these data infers that kaolin powder dispersed in solid rubber matrix acts as an additive which decreases the random movement of the polybutadiene chains. Consequently, dispersions of nano-particles in liquid and in solid sBR are considered to be related, thus leading to a theological method for selecting nano-particles as fillers in solid sBR.

关键词： Yield stress Kaolin Filler dispersion stiffness styrene-butadiene rubber (sBR)Liquid polybutadieneRheology

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Yield stress measurements and microstructure of colloidal kaolin powders clusterized and dispersed in different liquids

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particuology 2009年第6期7卷 438-444页

作者： Dario T.Beruto Alberto Lagazzo Rodolfo Botter Roberto Grillo Department of Civil Environmental and Architectural Engineering (DICAT)University of GenoaP.le Kennedy (Fiera del Mare)Pad. D16129-GenoaItaly artigo s.p.a. loc.Carpeneto17014-Cairo Montenotte (SV)Italy

Rheologicat measurements of four colloidal kaolin powders dispersed in water, paraffinic oil and liquid rubber have been done at solid concentration （9 （Vs/VL） in the range 8-33%. In quasi-static conditions the yield stress τ° values were derived. An s-shaped relationship between τ° and （9 exists, that allows to evaluate the percolation threshold θc values. In water θc ranges between 29% and 33%, while it is between 17% and 21% in oil and in liquid rubber. In water the microstructure units, i.e. the primary clusters among kaolin crystallites, are denser and bigger than the ones in the two other liquids. Furthermore, in quasistatic condition, the aqueous microstructure units have less tendency to cling together to form a network that can span all over the liquid phase. The different kaolin dispersions at θ equal to 22% are characterized by yield stress ranging between 7.s pa and 59 pa in water, 66-250 pa in oil and 230-770 pa in liquid rubber. It has been found that for any kaolin types the log τ°/ θ evaluated near to the percolation threshold is a conservative parameter of the three different liquids. These results are useful to design colloidal dispersions with selected microstructure.

关键词： Yield stress Colloid Dispersions Microstructure units Cluster Kaolin Rheology

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