Abstract
Anisotropy of the bridge fraction of middle isoprene block chains in the directions parallel and perpendicular to the shear flow direction in sheared films of sphere-forming polystyrene-b-polyisoprene-b-polystyrene triblock copolymers are examined by breaking stress under simple elongation measurements at a fast draw rate, which reflect the bridge fraction. There was no practical difference between the data obtained in two directions at tested shear rate region (5-15 sec-1). The absolute values are close to the values for non-sheared samples. Thus, we conclude that when flow is applied to sphere-forming triblocks, only small portion of end blocks are pulled out to flow and there is no orientation dependent anisotropy of bridge fractions.
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