Uniaxial extensional flow behavior of immiscible and compatibilized polypropylene/liquid crystalline polymer blends

Filipe, S.; Cidade, M. T.; Maia, João M.

doi:10.1007/s00397-005-0034-6

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…Also the morphology of incompatible blends is strongly dependent on the flow type. In elongational flow, the break‐up of the dispersed particles and its orientation is easily achieved even if the viscosity of the two phases is dramatically different 20–22. This is not true in shear flow when the break‐up of the dispersed particles is possible only when the viscosities of the two phases are similar.…”

Section: Introductionmentioning

confidence: 99%

Morphology and Properties of Polyethylene/Clay Nanocomposite Drawn Fibers

Mantia

Dintcheva

Scaffaro

et al. 2008

Macro Materials & Eng

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The influence of an elongational flow on the morphology of PE/clay nanocomposite drawn fibers was studied. An increase of the elastic modulus and the tensile strength as well as a decrease of the elongation at break are observed with increasing draw ratio. The applied elongational gradient orients the polymer chains and the clay particles along the spinning direction. When the applied flow results in the formation and the orientation of exfoliated nanoparticles, a pronounced increase of the mechanical properties is observed. The dispersed clay particles can be broken and oriented by the extensional flow, which might indicate a flow‐induced intercalated/exfoliated morphology transition.

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Section: Introductionmentioning

confidence: 99%

Morphology and Properties of Polyethylene/Clay Nanocomposite Drawn Fibers

Mantia

Dintcheva

Scaffaro

et al. 2008

Macro Materials & Eng

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“…On the other hand, only a few studies explored rheological properties of polymer blends in elongation. Therefore, theoretical and experimental investigations on the elongation of blends of immiscible polymers in the molten state are presently undertaken in order to elucidate the behavior of polymer blends during this basic mode of deformation (Levitt et al 1997;Mechbal and Bousmina 2004;Heindl 2005;Handge and Pötschke 2004;Handge 2005;Oosterlink et al 2005;Filipe et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Recoverable deformation and morphology after uniaxial elongation of a polystyrene/linear low density polyethylene blend

2007

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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 o C. 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.Keywords PS/LLDPE blend · Recoverable strain after uniaxial elongation · Morphology development during recovery · Effective medium approximation

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