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Novel results on the thermomechanical and rheological properties of poly (Styrene-b-Ethylene-co-Butylene-b-Styrene) (SEBS) copolymers of molecular weight close to Mw = 200,000 g/mol, with varying styrene content and ethylene/butylene proportion, are presented. DSC and DMTA tests reveal that only the sample which contains more ethylene than butylene in PEB midblock chains is able to crystallize. Small...
Poly(styrene)-poly(ethylene-co-butylene)-poly(styrene) (SEBS) triblock copolymers with a PS volume fraction ϕ=0.30 are investigated. The analysis of the loss tangent at low frequencies leads to define a mechanical relaxation associated to the blocking effect of ordered PS cylinders on PEB chains motion. Submitting SEBS to a shear flow at 250°C an orientation of the cylinders is observed. The effect...
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