Recoverable deformation and morphology after uniaxial elongation of a polystyrene/linear low density polyethylene blend |
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Authors: | Ulrich A Handge Kenzo Okamoto Helmut Münstedt |
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Institution: | 1.Department of Materials,ETH Zurich, Institute of Polymers, HCI H 529,Zurich,Switzerland;2.Department of Materials Science,Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg,Erlangen,Germany |
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Abstract: | The transient recoverable deformation ratio after melt elongation at various elongational rates and maximum elongations was
investigated for pure polystyrene and for a 85 wt.% polystyrene/15 wt.% linear low density polyethylene (PS/LLDPE 85:15) blend
at a temperature of 170 oC. The ratio p of the zero shear rate viscosity of LLDPE to that of PS is p = 0.059 ≈ 1:17. Retraction of the elongated LLDPE droplets back to spheres and end-pinching is observed during recovery.
A simple additive rule is applied in order to extract the contribution of the recovery of the elongated droplets from the
total recovery of the blend. In that way, the recoverable portion of the PS/LLDPE blend induced by the interfacial tension
is determined and compared with the results of a theory based on an effective medium approximation. The effective medium approximation
reproduces well the time scale of the experimental data. In addition, the trends that the recoverable deformation increases
with elongational rate and maximum elongation are captured by the theoretical approach. |
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Keywords: | PS/LLDPE blend Recoverable strain after uniaxial elongation Morphology development during recovery Effective medium approximation |
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