Abstract
Reductions of molecular weight dependences of the zero-shear viscosity η0 and the steady-state compliance Je0 for multi-branched star polystyrenes with different numbers (P=7∼40) and molecular weights (Ms=1.3∼20×104) of branches as well as those of small- number (six or less) branched polystyrenes and linear ones have been investigated. The reduction methods of η0 and Je0 ever established both theoretically and experimentally for small-number branched star polymers could not be applied to multi-branched star polymers. We tried to reduce the data of η0 and Je0 for multi-branched star polymers by corrected molecular weights by considering the expansion of molecules. In the course of discussions we proposed a new method to estimate the unperturbed dimensions of star polymers from the rheological measurements.
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