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Crystallization regimes and reptation in polypropylene molecular weight fractions
Author(s) -
Ibhadon A. O.
Publication year - 1999
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(19990124)71:4<579::aid-app9>3.0.co;2-6
Subject(s) - reptation , tacticity , crystallization , nucleation , dispersity , materials science , crystallization of polymers , polyethylene , thermodynamics , polymer , polymer chemistry , molar mass distribution , polypropylene , chemical engineering , polymerization , physics , composite material , engineering
Crystal growth rate data based on the kinetic nucleation theory of chain folding and the effect of reptation, have been used to predict the rate of crystal growth at moderate to high supercoolings in iPP molecular weight fractions. Growth rate data obtained for the fractions seem to be in agreement with the theoretical predictions of the regime theory. However, an extension of the gambler ruin treatment to the iPP data has not been successful with regard to the dominant morphology in regime II. The variable cluster model suggested as the morphology for polyethylene in regime II does not appear to be evident from this study. The effect of polydispersity, molecular weight, and tacticity on the crystallization behavior of iPP fractions have also been studied and correlated with the structure of polymer samples investigated. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 579–584, 1999