Influence of molecular weight on the fracture properties of aliphatic polyketone terpolymers


Zuiderduin, W.C.J. and Homminga, D.S. and Huetink, H.J. and Gaymans, R.J. (2003) Influence of molecular weight on the fracture properties of aliphatic polyketone terpolymers. Polymer, 44 (20). pp. 6361-6370. ISSN 0032-3861

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Abstract:The influence of polymer molecular weight on the mechanical properties of aliphatic polyketones was investigated. The molecular weight
varied from 100,000 to 300,000 g mol21. The crystallinity was found to be independent of polymer molecular weight, as was the glass
transition temperature. The yield strength and stiffness of the aliphatic polyketone terpolymers were also found to be independent of
molecular weight. The post yield behaviour showed strong dependency on polymer chain length. The draw stress was increased significantly
with higher molecular weight material. The impact resistance was increased with molecular weight, resulting in ductile fractures with large
energy consumption upon fracture. The brittle-to-ductile transition temperature was lowered with increasing chain length. The difference in
material deformation was linked to the higher mechanical connectivity and more stable post yield behaviour of the polymers with an
increased molecular weight
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Copyright:© 2003 Elsevier
Engineering Technology (CTW)
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