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Heterogeneity of crystalline structure of injection‐moulded and drawn isotactic polypropylene studied by DSC
Author(s) -
Kratochvil J.,
Kotek J.,
Sikora A.,
Raab M.
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991470115
Subject(s) - tacticity , differential scanning calorimetry , materials science , polypropylene , composite material , polymer , thermodynamics , polymerization , physics
Differential scanning calorimetry (DSC) was used to characterize crystalline structure of injection‐moulded specimens of isotactic polypropylene and corresponding materials prepared by solid‐state drawing at various temperatures. It was shown that the DSC can assess the differences between individual specimens and structural gradients and heterogeneities within one typical test piece. In particular, relative proportions of the crystalline α and β modifications in different locations of an injection‐moulded specimen and structural transformation in the neck shoulder could be established. Variations of the crystalline structure along the edge of drawn specimens were interpreted as a record of temperature and stress fluctuations in the propagating neck shoulder.