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The viscous and elastic behaviour of the saturated triblock copolymer polystyrene‐block‐poly(ethylene‐co‐butylene)‐polystyrene (SEBS) was investigated using a capillary viscometer. The viscous behaviour was evaluated from the variation of viscosity with shear and temperature, and the elastic behaviour from the capillary entrance pressure loss, die swell ratio and surface roughness. The melt behaviour was found to result from the two‐phase structure which existed up to a particular shear and/or temperature and thereafter from the single‐phase structure.
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Mathew et al. (1994) studied this question.
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