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Stereoblock polypropylene/isotactic polypropylene blends. IV. Cocrystallization and phase separation

✍ Scribed by S. V. Canevarolo; F. De Candia

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 307 KB
Volume: 61
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19960711)61:2<217::aid-app4>3.0.co;2-s

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✦ Synopsis

The blending process of stereoblock isotactic polypropylene and isotactic polypropylene (sbiPP/iPP) including a well distribution of the components (by solvent mixing), posterior hot pressing (shear mixing), and a final quenching into ice water freezing these blends at room temperature in a particular flow oriented cocrystallized structure. This structure gives rise to a birefringent pattern which is stable up to 17OoC when it disappears by melting. In the molten state the two components segregate destroying the original flow oriented structure. In the following cooling the iPP crystallizes in a spherulitic form and the sbiPP phase crystallizes only partially disturbed by the restrictions imposed by the iPP crystals.

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