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  Kinetics of isothermal crystallization in isotactic polypropylene monitored with rheology and Fourier-transform rheology

Dötsch, T., Pollard, M., & Wilhelm, M. (2003). Kinetics of isothermal crystallization in isotactic polypropylene monitored with rheology and Fourier-transform rheology. Journal of Physics-Condensed Matter, 15(11 Sp. Iss. SI), S923-S931.

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Dötsch, T.1, Autor           
Pollard, M.1, Autor           
Wilhelm, Manfred1, Autor           
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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 Zusammenfassung: Linear and Fourier-transform rheology were used to study the influence of the oscillatory shear amplitude, γ0, on the isothermal crystallization at 140 °C of three commercial isotactic polypropylenes. The development of the crystallization was monitored through the time dependence of the dynamic storage modulus, G'(t), and the normalized intensity of the third harmonic of the stress waveform, I3(t), a quantification of the degree of nonlinearity under oscillatory shear conditions. A change in the exponent, n, of the power law describing growth, according to G'norm(t) similar to tn was observed at t similar to 4 h. For t < 4 h, n was between 3 and 4. This change in growth kinetics was also accompanied by a maximum in I3(t). Below γ0 = 0.05, these results were independent of the applied strain amplitude. Above γ0 = 0.05, failure of the polypropylene in the parallel plate geometry due to stress build-up was often observed in the late stages of crystallization. This was accompanied by a sharp decrease of G'(t), and a simultaneous sharp increase of I3(t). Additionally, the presence of even harmonies in the spectrum was observed after failure. Notably, a plateau of I3(t) at least 1 h before actual failure indicating a greater sensitivity to its onset than that of G'(t).

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Sprache(n): eng - English
 Datum: 2003-03-26
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: eDoc: 28347
ISI: 000182148100017
Anderer: P-03-29
 Art des Abschluß: -

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Titel: Journal of Physics-Condensed Matter
  Alternativer Titel : J. Phys.-Condens. Matter
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 15 (11 Sp. Iss. SI) Artikelnummer: - Start- / Endseite: S923 - S931 Identifikator: ISSN: 0953-8984