Influence of thermal treatments, molecular weight, and molecular weight distribution on the crystallization of β-isotactic polypropylene

Six samples of isotactic polypropylene were examined to study the influence of the thermal treatments and the molecular weights and their distribution on the β‐crystallization of the polymer. The highest amount of the β‐phase was obtained by isothermal crystallization and in correspondence of high a...

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Bibliographic Details
Published in:Journal of applied polymer science 2004-01, Vol.91 (2), p.1008-1012
Main Authors: Marigo, Antonio, Marega, Carla, Causin, Valerio, Ferrari, Paolo
Format: Article
Language:English
Subjects:
Applied sciences
DSC
Exact sciences and technology
isotactic polypropylene
Physicochemistry of polymers
Polymer industry, paints, wood
SAXS
Technology of polymers
WAXS
β-crystallization
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Summary:Six samples of isotactic polypropylene were examined to study the influence of the thermal treatments and the molecular weights and their distribution on the β‐crystallization of the polymer. The highest amount of the β‐phase was obtained by isothermal crystallization and in correspondence of high average molecular weights and wide molecular weight distributions. Small‐angle X‐ray scattering pointed out that a partial β‐crystallization seems not to influence the lamellar morphology parameters. Differential scanning calorimetry measurements, at different heating rates, allowed us to confirm that the multiple melting endotherms behavior of the β‐phase is to be correlated to a melting–recrystallization–melting mechanism. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 1008–1012, 2004
ISSN:0021-8995
1097-4628
DOI:10.1002/app.13260