Dynamic-mechanical behavior of highly drawn isotactic polypropylene

Fibers of isotactic polypropylene were obtained by high‐temperature drawing, adopting a two‐stage process. Very high drawing degrees were achieved, more than 40. The physical behavior was analyzed by determining the dynamic‐mechanical relaxation spectra in monoaxial stretching. The results obtained...

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Bibliographic Details
Published in:Journal of applied polymer science 1992-12, Vol.46 (10), p.1799-1806
Main Authors: De Candia, F., Romano, G., Baranov, A. O., Prut, E. V.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fibers and threads
Forms of application and semi-finished materials
Polymer industry, paints, wood
Technology of polymers
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Summary:Fibers of isotactic polypropylene were obtained by high‐temperature drawing, adopting a two‐stage process. Very high drawing degrees were achieved, more than 40. The physical behavior was analyzed by determining the dynamic‐mechanical relaxation spectra in monoaxial stretching. The results obtained show that the elastic modulus reaches a saturation value at deformation degrees of about 20, well below the drawability upper limit, indicating that above 20 any further drawing does not affect the structure. Moreover the α transition appears weak or absent in the drawn samples, while the β transition is still readily detectable. Both effects agree with Peterlin's model of drawing and with the fiber structure. © 1992 John Wiley & Sons, Inc.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.1992.070461011