التفاصيل البيبلوغرافية
| العنوان: |
Tensile and Flexural Properties of ß-Nucleated Polypropylenes |
| المؤلفون: |
Obadal, M., Cermák, R., Habrová, V., Stoklasa, K., Šimoník, J. |
| المصدر: |
International Polymer Processing; September 2004, Vol. 19 Issue: 3 p308-312, 5p |
| مستخلص: |
Resuming our previous work on ß-nucleated polypropylenes, namely on their impact strength, our present work directs attention towards a flexural and tensile behavior of ß-nucleated polypropylenes (ß-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 ß-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 ß-phase content decreased both tensile and flexural strength; on the other hand, the presence of ß-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 ß-phase is particularly pronounced by faster deformation processes, such as fast drawing or impact load. |
| قاعدة البيانات: |
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