[article]
| Titre : |
Drawing of β-crystal nucleator added PP |
| Type de document : |
texte imprimé |
| Auteurs : |
M. Fujiyama, Auteur |
| Année de publication : |
1999 |
| Article en page(s) : |
p. 75-82 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
668.9 Polymères |
| Résumé : |
Fibers and films - Extruded sheets were prepared from homo-isotactic poly-propylenes (PP) with 0 to lOppm of quinacridonequinone which is a β-crystal nucleatorfor PP and the characteristics of drawing behavior and properties of drawn sheets were studied. The sheet without the nucleator consisted of usual α-crystals (hereinafter called α-PP), whereas the sheets with the nucleator contained much β-crystals (hereinafter called β-PP), whose content slightly increased with increasing nucleator content. While the tensile yield stress of the β-PP is lower than that of the α-PP, the drawing stress ofthe former is higher than that of the latter at the higher strain region öfter yielding. Even öfter drawn, the β-crystals remain in the α-crystals with low crystallinity at low drawing temperatures. However, the β-crystals and amorphous phase gradually decrease with increasing drawing temperature, and the α-crystals dominate above 80°C. The resultant tensile modulus and strength of the drawn sheets show maxima at drawing temperatures of 40 to 80°C on a balance between the effects of crystallinity and molecular orientation. The tensile modulus and strength of drawn sheet prepared from the β-PP are higher than those prepared from the α-PP by about 10% at those temperatures. The tensile elongation of drawn sheet prepared from the β-PP is slightly higher than that prepared from the α-PP at low drawing temperatures due to the remained β-crystals. |
| Note de contenu : |
- EXPERIMENTAL : Base resins - Sheet extrusion - Drawing experiment - Measurements
- RESULTS AND DISCUSSION : Characteristics of base resins and extruded sheets - Drawing characteristics - Structure of drawn samples during drawing - Properties of drawn samples |
| DOI : |
10.3139/217.1525 |
| En ligne : |
https://drive.google.com/file/d/1LK97f7ihnSY1TCXdvAU22F1OoL1ems1w/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16115 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 1 (03/1999) . - p. 75-82
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