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The Ferry Reduction and the Activation Energy for Viscous Flow

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1 Author(s)
Hopkins, I.L. ; Bell Telephone Laboratories, Inc., Murray Hill, New Jersey

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The relationship proposed by Ferry and his co‐workers for the effects of frequency and temperature on the dynamic properties of certain polymers is shown to lead to a method for calculating the activation energy of viscous flow from relaxation, creep, and dynamic test data, the results agreeing with those obtained in steady‐state flow. The Ferry reduction explains, and is supported by, observed increases in dynamic modulus and viscosity with increasing temperature.

Published in:

Journal of Applied Physics  (Volume:24 ,  Issue: 10 )