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Licensed Unlicensed Requires Authentication Published by De Gruyter May 2, 2013

Tensile and Flexural Properties of β-Nucleated Polypropylenes

  • M. Obadal , R. Cermák , V. Habrová , K. Stoklasa and J. Šimoník


Resuming our previous work on β-nucleated polypropylenes, namely on their impact strength, our present work directs attention towards a flexural and tensile behavior of β-nucleated polypropylenes (β-iPP). For the purposes of this work, commercially available isotactic polypropylene was modified using various amounts of a specific nucleating agent based on N, N′-dicyclohexylnaphtalene-2,6-dicarboxamide (NU100). From the prepared blends test specimens were prepared by injection molding. Structural characterization (crystallinity and the content of β-phase) was carried out by X-ray diffractometry. A multipurpose mechanical property tester was used for determination of tensile and flexural properties. It was found that β-phase content decreased both tensile and flexural strength; on the other hand, the presence of β-phase dramatically raised cold drawability of the injection-molded specimens; addition of 0.03 wt.% of NU100 in the injection-molded parts led to a more than 800 % increase of the draw ratio of specimens tested at the testing speed of 100 mm/min. Furthermore, tensile testing carried out using various strain speeds (10 and 100 mm/min) revealed that higher ductility of the material containing β-phase is particularly pronounced by faster deformation processes, such as fast drawing or impact load.

Mail address: M. Obadal, Tomas Bata University in Zlín, Faculty of Technology, Department of Polymer Engineering, TGM 275, 76272 Zlín, Czech Republic E-mail:


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Received: 2004-7-8
Accepted: 2004-7-15
Published Online: 2013-05-02
Published in Print: 2004-09-01

© 2004, Carl Hanser Verlag, Munich

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