Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 298, Issue 9, Pages 991-1003Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201200199
Keywords
flow-induced crystallisation; nucleating agents; polymer morphology; X-ray scattering
Funding
- Australian Synchrotron Research Program
- Commonwealth of Australia under the Major National Research Facility Program
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This study explored the combined influence of shear flow and nucleating agents on isotactic polypropylene (iPP) crystallisation. The study showed that oriented alpha-iPP crystals were not necessary to form beta-iPP crystals, contrary to the accepted view that the surface of oriented alpha-iPP crystals provides nucleation sites for an alpha-iPP to beta-iPP growth transition. Instead it was proposed that flow-induced mesomorphic point-like nuclei preferentially nucleates beta-iPP. The combined effect of shear flow and nucleant was found to promote gamma-iPP crystals. The surprising gamma-iPP nucleation effect was explained by the high density of flow-induced and heterogeneous nuclei present at the start of crystallisation.
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