Self‐interference flow of an isotactic polypropylene melt in a cavity during injection molding. II. Morphology and crystallinity | Zendy

Dai Wenli | Zendy; Lui Pengsheng | Zendy; Wang Xiayu | Zendy

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Self‐interference flow of an isotactic polypropylene melt in a cavity during injection molding. II. Morphology and crystallinity

Author(s) -

Dai Wenli,

Lui Pengsheng,

Wang Xiayu

Publication year - 2003

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/app.12111

Subject(s) - crystallinity , materials science , polypropylene , tacticity , differential scanning calorimetry , scanning electron microscope , composite material , molding (decorative) , morphology (biology) , melt flow index , polymer , copolymer , polymerization , physics , genetics , biology , thermodynamics

This article is principally concerned with the morphology and crystallinity of isotactic polypropylene (iPP) parts molded by injection molding, during which a self‐interference flow (SIF) occurs for the melt in the cavity. Scanning electron microscopy shows that a transverse flow takes place in SIF samples. Wide‐angle X‐ray diffraction and differential scanning calorimetry show that SIF moldings exhibit a γ phase, in addition to α and β phases, and high crystallinity. Meanwhile, the results for iPP moldings made by the conventional flow process, that is, conventional injection molding, are reported for comparison. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2791–2796, 2003

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