Journal
CHINESE JOURNAL OF POLYMER SCIENCE
Volume 33, Issue 11, Pages 1625-1632Publisher
SPRINGER
DOI: 10.1007/s10118-015-1708-x
Keywords
alpha-Form iPP; Banded spherulites; Vibration injection molding; Oscillatory pressure
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Isotactic polypropylene (iPP) samples obtained by pressure vibration injection molding (PVIM) and conventional injection molding (CIM) were studied by polarized-light microscopy (PLM), respectively. It was found that the alternating bright and dark banded spherulites were generated in the transitional region of PVIM parts. It is the first time that the banded spherulites of isotactic polypropylene were observed in polymer processing. What's more, the banded spherulites were proved to be constituted of alpha-form crystal by hot stage polarized-light microscopy (HT-PLM) and wide angle X-ray diffraction (WAXD). Morphology of the banded spherulites was also studied by scaning electronical microscopy (SEM).
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