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Rheologica Acta

Erschienen in:

01.07.2003 | Original Contribution

Flow as an effective promotor of nucleation in polymer melts: a quantitative evaluation

verfasst von: H. Janeschitz-Kriegl, Ewa Ratajski, Manfred Stadlbauer

Erschienen in: Rheologica Acta | Ausgabe 4/2003

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Abstract.

An apparatus is presented which enables the application of defined portions of mechanical work to the polymer sample in its state of undercooled melt. For the purpose mainly intermittent shear creep is used. Results are presented for an industrial grade of polypropylene. A three-dimensional picture is presented, in which the resulting numbers of nuclei (per unit volume) are plotted against two responsible parameters: crystallization temperature and mechanical work. With decreasing temperature and with increasing mechanical work the number of nuclei increases by many decades.

At sufficiently high mechanical loads a transition to thread-like precursors ("shishs") has been observed previously. Oriented structures (kind of "shish-kebabs") are formed in this way. The periods of shearing applied have always been extremely short compared with the time until crystallization becomes observable. In this way an accumulation of various processes could be avoided. The description of shear induced crystallization, as previously given, is modified in the light of the present results.

Vorheriger Artikel Stress relaxation after a step strain in uniaxial extension of polyisobutylene and polyethylene

Nächster Artikel Obtaining the shear stress shear rate relationship and yield stress of liquid foods from Couette viscometry data

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Titel: Flow as an effective promotor of nucleation in polymer melts: a quantitative evaluation
verfasst von: H. Janeschitz-Kriegl
Ewa Ratajski
Manfred Stadlbauer
Publikationsdatum: 01.07.2003
Verlag: Springer Berlin Heidelberg
Erschienen in: Rheologica Acta / Ausgabe 4/2003
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-002-0247-x

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