The effect of the moulding conditions on the semicrystalline structure of polypropylene

The semicrystalline structure of isotactic polypropylene (iPP) moulded by oscillating melt-flow (rheomoulding) has been studied using low-frequency Raman scattering (coupled with optical interference reflection microscopy and wide-angle X-ray scattering). It was compared to the structure of typicall...

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Bibliographic Details
Published in:Polymer (Guilford) 1997-07, Vol.38 (15), p.3957-3965
Main Authors: Minardi, A., Boudeulle, M., Duval, E., Etienne, S.
Format: Article
Language:English
Subjects:
Applied sciences
crystallinity
Exact sciences and technology
Injection moulding
Machinery and processing
Moulding
Plastics
poly(propylene)
Polymer industry, paints, wood
Technology of polymers
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Summary:The semicrystalline structure of isotactic polypropylene (iPP) moulded by oscillating melt-flow (rheomoulding) has been studied using low-frequency Raman scattering (coupled with optical interference reflection microscopy and wide-angle X-ray scattering). It was compared to the structure of typically moulded iPP. We observed that only the relatively narrow central zone of the bar has a spherulitic organization in the rheomoulded specimen, while the external layers on each side have a perfectly oriented crystalline structure. The crystal structure, the orientation, the size of the crystallites and the effect of annealing were determined.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(96)00947-0