Abstract
The kinetics of creep in polypropylene are compared with those in a rubber-toughened polypropylene “co-polymer” at 20° C. Rate coefficients, defined by fitting the data to the Andrade equation, are shown to increase exponentially with applied stress, in accordance with the Eyring equation. The activation volume for polypropylene is 2.45 nm3. Addition of rubber particles accelerates creep by increasing the Eyring stress concentration factor, which has a value of 1.56 in the co-polymer. The dominant mechanism of creep in both polymers is shear yielding: there is no detectable dilatation in the homopolymer, but the co-polymer shows a small increase in volume with time under load.
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Bucknall, C.B., Page, C.J. Rubber-toughening of plastics. J Mater Sci 17, 808–816 (1982). https://doi.org/10.1007/BF00540378
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DOI: https://doi.org/10.1007/BF00540378