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The effect of shear controlled orientation in injection moulding on the mechanical properties of an aliphatic polyketone

✍ Scribed by Gürhan Kalay; Michael J. Bevis

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
762 KB
Volume
35
Category
Article
ISSN
0887-6266

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✦ Synopsis

This article relates to an investigation of injection moulding a new commercial polymer, an aliphatic polyketone (PK). A terpolymer and a 30% glass-filled grade were used as study materials together with an isotactic polypropylene that was used as a basis for comparison. Both conventional injection moulding and shear-controlled orientation injection moulding (SCORIM) were employed in processing. Tensile testing was carried out at 80ЊC as well as at room temperature. Polarized light microscopy and wide-angle x-ray diffraction were used in the characterization of the mouldings. An increase of up to 30% in Young's modulus and 35% in ultimate tensile strength, and a 70-90% increase in strain at peak were gained for the terpolymer (PK) at room temperature, as a result of SCORIM processing. A substantial improvement at 80ЊC was also recorded for unfilled SCORIM PK mouldings, and is attributed to the pronounced molecular alignment that was induced in SCORIM mouldings, as shown by Debye patterns. It is notable that the SCORIM mouldings of PK exhibit a greater tensile strength at 80ЊC than the SCORIM mouldings of isotactic polypropylene at 23ЊC.

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