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Maryam Mudasir, Riaz Ahmed
An Explanation of Structure-Property Relationships for Polymer/Clay-Nanocomposites through Melt Flow Birefringence and Damping Function
Appl. Rheol. 27:5 (2017) 53700 (11 pages)
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Rheological investigations are reported for pure polyolefin and its clay-nanocomposites to establish structure-properties relationship
with respect to filler concentration. Flow birefringence is performed through an engineering geometry slit-die to
obtain centerline principal stress difference during elongational flow. The centerline stress profile of clay-nanocomposite
revealed additional viscoelastic nature even at low silicate concentrations whereas at the slit entrance no exceptional strain
hardening was reported. Effects of higher filler concentrations are further examined during the simple shearing flow where
non-terminal low frequency strain hardening only at maximum concentration of clay exhibited pseudo solid like response
with improved dynamic moduli. The increase in damping coefficient with increasing clay concentration shows polymernanocomposites
are more strain sensitive. The Wagner exponential damping function could adequately describe the timestrain
separability at all clay concentrations studied. The results of this investigation reveal that the polymers are time-strain
separable at all clay concentrations during elongational and simple shearing flows. But different molecular orientations are
possible according to layers alignment along the flow direction.
► Cite this publication as follows:
Mudasir M, Ahmed R: An Explanation of Structure-Property Relationships for Polymer/Clay-Nanocomposites through Melt Flow Birefringence and Damping Function, Appl. Rheol. 27 (2017) 53700.
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