A study of the yield and post‐yield behavior of syndiotactic polypropylene |
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Authors: | Claudia Marano Nadia Perillo Marta Rink |
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Institution: | Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Piazza Leonardo da Vinci 32, , 20133 Milano, Italia |
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Abstract: | The strain recovery of three syndiotactic polypropylenes (s‐PPs) differing in the percentage of rrrr] pentad is investigated. A suitable method based on loading–unloading tests at constant displacement rate in tensile loading conditions is adopted to measure the residual and recovered strain components of the applied strain. The method allows to obtain a large amount of data from few tests and to explore a wide strain range. The dependence of the material's strain recovery on the applied strain is analyzed in relation to s‐PP strain‐induced microstructural changes and crystalline form transitions, which are reported in literature. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014 , 52, 1276–1282 |
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Keywords: | crystal structures poly(propylene) (PP) structure‐property relations syndiotactic yielding |
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