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Injection molding of polypropylene: X‐ray investigation of the skin–core morphology
Author(s) -
Wenig W.,
Herzog F.
Publication year - 1993
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.1993.070501216
Subject(s) - lamellar structure , small angle x ray scattering , materials science , core (optical fiber) , polypropylene , scattering , morphology (biology) , monoclinic crystal system , crystal (programming language) , composite material , molding (decorative) , x ray , crystallography , optics , crystal structure , chemistry , physics , programming language , biology , computer science , genetics
The skin–core morphology of injection‐molded polypropylene bars has been investigated employing X‐ray small‐and wide‐angle scattering. The small‐angle scattering has been evaluated by means of interface distribution functions. It is found that skin and core exhibit different morphologies. In the skin, the crystal lamellae are oriented primarily around the c axis, but a (small) fraction of a * ‐axis‐oriented lamellae also exists. The lamellar thickness in the skin layer measured from the meridional small‐angle X‐ray scattering shows higher values than in the core. The composition of the monoclinic α 1 , α 2 crystal modifications show dependencies that are typical for the cooling conditions in the mold during injection. © 1993 John Wiley & Sons, Inc.