English Abstract
Studies on Structures and Properties of Organoclay / Thermoplastic Elastomer Composites, Part 1.
Effects of the Mixing Methods on the Properties of SBS Composites with Organoclay.

Tomohiro Yamaguch
Aichi Industrial Technology Institute,Aichi,Japan
Eisuke Yamada
Department of Applied Chemistry, Aichi Institute of Technology,Aichi,Japan
Nippon Gomu Kyokaishi,(2003),76(11), 399-404 Original Paper in Japanese.

Styrene-butadiene-styrene triblock copolymer (SBS) composites dispersed with organoclay (stearyl ammonium-modified montmollironite, C18-Mt) were prepared by the melt-mixing method, and the solution-mixing (as-cast and melt-press) methods. The structures of the composites were evaluated using X-ray diffractmeter (XRD), scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), and tensile properties of the composites were examined.
The composites by the melt-mixing method have partially intercalated structure. In the composites, large agglomerates (aboutand small aggregates (several hundred nm) were observed. Whereas, the composites with less than 3wt% C18-Mt by the as-cast method have intercalated structure, and those with more than 5wt% C18-Mt have intercalated structure after melt-pressing at. In the composites, small particles (about were dispersed uniformly. As the results of DMA, it was found that C18-Mt inhibited polystyrene aggregate in the composites by the melt-press method. Tensile moduli of the composites by preparing the melt-press method were higher than those of the composites by the melt-mixing method and increased with increasing C18-Mt content. Tensile properties at break of the composites by the both methods decreased with increasing C18-Mt content compared with SBS control.

Styrene-butadiene-styrene triblock copolymer, Organoclay, SBS composites, Mixing method, Tensile property, X-ray diffractmeter, Scanning electron microscopy, Dynamic mechanical analysis.