The occurrence of the γ-phase in injection moulded polypropylene in relation to the processing conditions

Wide-angle X-ray diffraction has been used to characterize different grades of conventionally injection moulded and shear-controlled-orientation injection moulded isotactic polypropylene. The occurrence of the γ-phase in injection mouldings was discussed in particular. A newly defined γ-phase index...

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Bibliographic Details
Published in:Polymer (Guilford) 1996-05, Vol.37 (11), p.2077-2085
Main Authors: Kalay, Gürhan, Zhong, Zhaoping, Allan, Peter, Bevis, Michael J.
Format: Article
Language:English
Subjects:
molecular orientation
polypropylene
γ-phase
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Summary:Wide-angle X-ray diffraction has been used to characterize different grades of conventionally injection moulded and shear-controlled-orientation injection moulded isotactic polypropylene. The occurrence of the γ-phase in injection mouldings was discussed in particular. A newly defined γ-phase index is used as a criterion for the characterization of mouldings. The γ-phase was shown to be associated with pronounced molecular orientation while the β-phase is indicative of low modulus. Shear-controlled-orientation injection moulding (SCORIM) provided for a good control on the final properties of the mouldings.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(96)85852-6