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The effect of annealing on the elastoplastic response of isotactic polypropylene

A. D. Drozdov·J. deC. Christiansen
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Abstract

Four series of tensile loading-unloading tests are performed on isotactic polypropylene in the sub-yield domain of deformations at room temperature. In the first series, injection-molded specimens are used as produced, whereas in the other series the samples are annealed for 24 h at 120, 140 and 160 C, which covers the low-temperature region and an initial part of the high-temperature region of annealing temperatures. A constitutive model is developed for the elastoplastic behavior of a semicrystalline polymer. The stress-strain relations are determined by five adjustable parameters that are found by fitting the experimental data. The effect of annealing is analyzed on the material constants.

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A. D. Drozdov, J. deC. Christiansen. 2002-05-17. The effect of annealing on the elastoplastic response of isotactic polypropylene. https://arxiv.org/abs/cond-mat/0205362

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