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Enhanced spherulite growth rates of isotactic polypropylene in incompatible blends
Author(s) -
StJean G.,
Barreto M. C.,
Brown G. R.
Publication year - 1990
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760301714
Subject(s) - spherulite (polymer physics) , tacticity , materials science , miscibility , polypropylene , polyethylene , morphology (biology) , crystallization , isothermal process , composite material , growth rate , polymer chemistry , ionomer , chemical engineering , thermodynamics , polymer , polymerization , copolymer , physics , geometry , mathematics , biology , engineering , genetics
Isothermal radial growth rates ( G ) of isotactic polypropylene (iPP) spherulites in immiscible blends with a polyethylene based ionomer (1) partially neutralized with Zn +2 , (2) completely acidified, and (3) completely esterified have been determined at crystallization temperatures between 118 and 124°C by time‐lapse photomicroscopy. In these blends iPP spherulites grow with increased G as compared to that of pure iPP. This behavior is attributed to increases in the rate of transport, due to limited miscibility induced by mechanical mixing. However, subtle differences in the melting behavior suggest that changes in Spherulite morphology may also be a contributing factor.