English Abstract

Studies on Structures and Properties of Organoclay / Thermoplastic Elastomer Composites, Part 2. Preparation and Mechanical Properties of SBS Composites Using Organoclay Treated with Stearic Acid Tomohiro Yamaguchi Aichi Industrial Technology Institute, Aichi, Japan Eisuke Yamada Department of Applied Chemistry, Aichi Institute of Technology, Aichi, Japan Nippon Gomu Kyokaishi, (2004), 77(7), 238-243 Original Paper in Japanese. Abstract Polystyrene-block-polybutadiene-block-polystyrene (SBS) composites were prepared using organoclay (stearyl ammonium-modified montmollironite, C18-Mt) treated with stearic acid (SA) by the melt-mixing method. In SBS composites using C18-Mt treated with SA (C18-Mt(SA)/SBS composites), the particles of C18-Mt(SA) became smaller and were dispersed more uniformly with increasing the treating amount of SA to C18-Mt. The tensile modulus, the hardness and the tear strength of C18-Mt(SA)/SBS composites were superior to those of SBS composite with untreated C18-Mt (C18-Mt/SBS composite). For example, tear strength of 10wt% C18-Mt(SA)/SBS composite was 2.0 times higher compared to that of pure SBS, when the treating amount of SA to C18-Mt was 0.05 (weight ratio). The tensile strength and the elongation of C18-Mt(SA)/SBS composites were improved compared with those of C18-Mt/SBS composite. It was found that the treatment of C18-Mt with SA was useful to improve the mechanical properties and the dispersion of C18-Mt/SBS composite. Keywords: Stearic acid, Surface treatment, Organoclay, Stearyl ammonium-modified montmollironite, SBS, Nanocomposite, Melt-mixing method, Mechanical properties.

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