Orientational distribution of parent–daughter structure of isotactic polypropylene: a study using simultaneous synchrotron WAXS and SAXS
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The molecular and lamellar orientations of injection-moulded isotactic polypropylene were investigated using simultaneous wide- and small-angle X-ray scatterings. In order to obtain the meaningful degree of molecular orientation with respect to the flow direction, the axis orientations of parent and daughter lamellae were separately calculated. The molecular orientation of thin material is consistent with the lamellar orientation. However, the decrease in the lamellar orientation of thick material is associated with a constant degree of molecular orientation, which would indicate an intra slip between parent lamellae along the flow direction.
KeywordsFlow Direction Orientation Function Molecular Orientation Isotactic Polypropylene Crystalline Lamella
This work was performed at the Australian National Beamline Facility (ANBF) with support from the Australian Synchrotron Research Program, which is funded by the Commonwealth of Australia under the Major National Research Facilities Program. The authors are grateful to Dr. James Hester of ANSTO and Dr. Peter Farrington of Moldflow for their help in the experiments.