Properties of Hydrogenated Polystyrene-block-poly(styrene-co-butadiene)-block-polystyrene (SSEBS) and its Miscibility in the blends with Polypropylene

Abstract

Physical properties and morphology of a series of hydrogenated polystyrene-block-poly styrene-co-butadiene-block-polystyreneSSEBSwere investigated using tensile test, transmission electron micro-scopeTEMand pulse NMR. Physical properties and miscibility of the blends of SSEBS with isotactic polypropylenePPalso were investigated using the same methods. These SSEBS were prepared by hy-drogenation of anionically polymerized polystyrene-block-poly styrene-co-butadiene-block-polystyrene S-SB-S. The content of styrene in the SB block was varied from to 25 % in order to examine effects of styrene content. The total styrene contents of two end polystyrene blocks were about 15 %. Tensile strengths and scratch hunting resistance of the blends of those S-SEB-Ss with PP increased with increase in styrene content of SEB block. However, the miscibility of the blends slightly decreased with increase in the styrene content.