Preparation and Mechanical Properties of Fluorinated-mica Modified with Dialkyl Dimethyl Ammonium Cation / Poly(styrene-ethelenebuthylene-stylene) Copolymer(SEBS) Nanocomposites

摘要

Styrene-ethelenebuthylene-stylene triblock copolymer(SEBS) nanocomposites were prepared by melt-compounding SEBS pellets with fluorinated-mica modified with dialkyl dimethyl ammonium cation(OFM) powder using the twin-screw extuder. The styrene end group or ethelenebuthylene segment of SEBS was carboxylated. The dispersion state of the composites was evaluated by TEM observation and X-ray diffraction analysis Effect of the carboxyl groups of matrixes on exfoliation of OFM was investigated. The delaminated sheets of OFM were dispersed in end group carboxylated SEBS matrix. The mechanical properties of OFM/ end group carboxylated SEBS composites were superior to ones of ethelenebuthylene segment carboxylated SEBS composites. It is suggested that the excellent tensile strength occur by reason of the orderly microdomain structures of matrix SEBS induced by the exfoliated nano-size silicate layers.