Rate-, temperature-, and structure-dependent yield kinetics of isotactic polypropylene

T.B. Erp, van, D. Cavallo, G.W.M. Peters, L.E. Govaert

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The influence of cooling rate on the structure and resulting mechanical performance is explored for a set of isotactic polypropylenes with varying molecular weight, insertion of counits, and addition of a nucleating agent. A continuous variation of crystal type (a–mesomorphic phase competition) and structural features is obtained with cooling rate. These variations are discussed in relation to the strain rate- and temperature-dependent yield stress and time-to-failure kinetics. The deformation kinetics, characterized by constant activation volumes and energies in the Ree–Eyring theory, prove to be the same for various structures. Differences in thermal history are solely captured by two rate constants that are function of the structure. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012
Original languageEnglish
Pages (from-to)1438-1451
Number of pages14
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number20
Publication statusPublished - 2012


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