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A time‐resolved SAXS study on the crystalline morphology of long‐term stored isotactic polypropylene
Author(s) -
Xu JunTing,
Zhang YuJin,
Fan ZhiQiang
Publication year - 2004
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889804002791
Subject(s) - small angle x ray scattering , tacticity , differential scanning calorimetry , materials science , crystallography , crystal (programming language) , polypropylene , crystal structure , morphology (biology) , scattering , diffraction , polymer , chemistry , optics , composite material , polymerization , thermodynamics , physics , genetics , biology , computer science , programming language
The crystalline morphology of a long‐term stored metallocene isotactic polypropylene (mPP) has been studied with time‐resolved small‐angle X‐ray scattering (SAXS), differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction (WAXD), and compared with that of the freshly crystallized sample. It was found that both α and γ crystal forms occur in the long‐term stored mPP, whereas freshly crystallized mPP contains only the α crystal form. Double SAXS peaks were observed for the long‐term stored mPP, which can be assigned to the α and γ crystals. Based on the SAXS result, it is inferred that the crystal stacks of the α and γ forms in the long‐term stored mPP are arranged according to the block mode.