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Stereoblock polypropylene/isotactic polypropylene blends. IV. Cocrystallization and phase separation
Author(s) -
Canevarolo S. V.,
De Candia F.
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960711)61:2<217::aid-app4>3.0.co;2-s
Subject(s) - tacticity , materials science , polypropylene , quenching (fluorescence) , mixing (physics) , polymer chemistry , phase (matter) , solvent , composite material , polymer , chemistry , organic chemistry , polymerization , optics , fluorescence , physics , quantum mechanics
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 170°C 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. © 1996 John Wiley & Sons, Inc.