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Isotactic polypropylene crystallized from the melt. I. Morphological study
Author(s) -
Alraheil Ismail A.,
Qudah Ali M.,
Alshare' Mohammed
Publication year - 1998
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/(sici)1097-4628(19980214)67:7<1259::aid-app15>3.0.co;2-x
Subject(s) - lamellar structure , tacticity , materials science , crystallization , morphology (biology) , spherulite (polymer physics) , scanning electron microscope , composite material , isothermal process , polypropylene , electron microscope , optical microscope , polymer chemistry , chemical engineering , optics , polymer , polymerization , thermodynamics , engineering , physics , biology , genetics
The spherulitic structure of isotactic polypropylene (iPP) from the melt was studied by polarized light and scanning electron microscopy. From the crystallization morphology, it can be observed that crystallization of iPP from the melt below 132°C forms two types of spherulites, termed α‐ and β‐spherulites. The structure of iPP isothermally crystallized above 132°C shows α‐type only. The α‐spherulites have a complex crosshatched array of radial and tangential lamellar structures, while β‐spherulites have, to some extent, simpler lamellar morphology with lower crosshatching content compared with α‐type. However, in α‐spherulites the radial lamellar thickness is greater than that of tangential lamellae, but in β‐spherulites the radial and tangential lamellae have approximately the same thickness. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1259–1265, 1998