Elsevier

Polymer

Volume 37, Issue 11, May 1996, Pages 2077-2085
Polymer

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

https://doi.org/10.1016/0032-3861(96)85852-6Get rights and content

Abstract

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.

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