HYDROGENATED STYRENE THERMOPLASTIC ELASTOMER AND PREPARATION METHOD THEREFOR

A hydrogenated styrene thermoplastic elastomer with a unique micro-phase structure and a preparation method therefor. The thermoplastic elastomer comprises a hydrogenated styrene-conjugated diene block copolymer and anion polymerization monodispersion irregular polystyrene. Styrene monomers in the block copolymer have a weight percentage content of 50-80%, and a number-average molecular weight of 50000-300000 g/mol. In the thermoplastic elastomer, polystyrene exists in a dispersion phase form in a polymer matrix, a polystyrene dispersion phase with an average particle size of 400-900 nm and a polystyrene dispersion phase with an average particle size of 10-95 nm exist, an obvious internal friction peak (tanδ) is provided at -30-35 °C, a peak value of the internal friction peak is -5-10 °C, and the peak value tanδ ≥ 0.3. The thermoplastic elastomer has an optimum fogging effect when being used for producing products such as thin films, wires, sheets and the like; and moreover, the fogging effect is very exquis