Abstract
Dynamic moduli of high molecular weight monodisperse polystyrene melts and their binary blends have been measured as a function of frequency. The critical frequency ω c and loss modulus G″( ω c) corresponding to departure from Newtonian behaviour have been determined and related to the moments of molecular weight distribution. The experimental result that the product τ w ω c is independent of molecular weight distribution ( τ w is the weight-average relaxation time, defined as τ w = η o J o e ) has been interpreted by assuming: (1) the validity of the empirical Cox-Merz rule; and (2) that the transition from Newtonian to non-Newtonian behaviour in a steady shear flow occurs for a characteristic recoverable strain.
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