Dynamic Mechanical Property of Kaolinite/Styrene-Butadiene Rubber Composites

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Mechanics, Materials Science & Engineering, March 2017

ISSN 2412-5954

Dynamic Mechanical Property of Kaolinite/Styrene-Butadiene Rubber Composites1 Yinmin Zhang1, Hongli Song2, Qinfu Liu1, a, Shilong Zhang1, Yude Zhang3 1 School of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing, 100083 China 2

School of Geoscience and Engineering, Hebei University of Engineering, Handan, 056000 China

3

School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China

a

pzqm163@163.com DOI 10.2412/mmse.61.54.732 provided by Seo4U.link

Keywords: kaolinite, styrene-butadiene rubber, microstructure, dynamic mechanical properties.

ABSTRACT. The dynamic properties of kaolinite/styrene-butadiene rubber (SBR) composites filled by kaolinite were investigated to evaluate their real-world engineering applications. The results of field emission scanning electron microscopy (SEM), and transmission electron microscopy (TEM) revealed that the rubber chains were confined within the interparticle space of kaolinites, and that the nanoscale kaolinites exhibited a fine and physical dispersion in the SBR matrix. The dynamic properties of kaolinite/SBR composites were investigated by performing dynamic mechanical analysis (DMA) and rubber processing analysis (RPA). Both the decrease in kaolinite particle size and the increase in kaolinite content can greatly improve the storage modulus and reinforcing effect of kaolinite/SBR composites. A small particle size and a low filled content of kaolinite filler is favourable for the dynamic properties of kaolinite/SBR composites for tire products. The filler networking phenomenon attributed to the agglomeration-de-agglomeration of filler particles intensified as the kaolinite particle size was reduced and the kaolinite content was increased, which resulted from the increase in the unit volume fraction of kaolinite in the rubber matrix and the stronger interaction of kaolinite particles in the composite matrix.

Introduction. Layered clay minerals/polymer nanocomposites have received considerable attention from the industry and academic researchers because these materials have exhibited remarkably improved properties, such as improved mechanical properties and thermal ability, enhanced barrier property, and decreased flammability [1-7]. In particular, rubber is an important class of polymer materials because of its outstanding characteristics and special applications [8]. Many researchers have applied different approaches to modify clay minerals, which are then incorporated into rubber matrix by latex blending and simple melt mixing [5, 9]. Such practices have achieved slight improvements in the mechanical, thermal, and barrier properties of clay/rubber composites [6, 8, 10, 11]. The dynamic mechanical property is one of the important physical properties of rubber compounds, particularly for tire applications and for other dynamic rubber products; this property reflects the actual performance of rubber products[12]. Of considerable significance is the dynamic mechanical behavior of rubber materials determined under a wide range of frequencies and temperatures. This behavior can be evaluated by the storage modulus (E/), the loss modulus (E//), and the loss tangent ( ) defined by = E/// E/, where E/ is the storage modulus resulting from the stored elastic energy in the materials and E//is the loss modulus resulting from viscous dissipation [13-15]. Many studies have investigated dynamic mechanical properties of rubber polymer materials based on various modified fillers, including the carbon black, silica, graphite, cellulose, and organoclay [16-18].

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Authors. Published by Magnolithe GmbH. This is an open access article under the CC BY-NC-ND license http://creativecommons.org/licenses/by-nc-nd/4.0/

MMSE Journal. Open Access www.mmse.xyz

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