Premium
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