Rheological Properties of Polyolefin Blends Containing Long-Chain Branched Polypropylene as Dispersed Phase

Yamaguchi, Masayuki; Fujii, Yoko; Phulkerd, Panitha

doi:10.1678/rheology.48.109

Cited by 5 publications

(1 citation statement)

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“…This is currently one of the main purposes of employing polymer blends. Their purposes can roughly be classified into two categories: (1) to provide strain hardening in the transient elongational viscosity [ 23‐31 ] and (2) to decrease the shear viscosity to enhance flowability. In the latter case, adding low‐molecular‐weight compounds has been employed as a conventional method, which largely reduces the shear viscosity in the low shear rate region.…”

Section: Introductionmentioning

confidence: 99%

Viscosity decrease by interfacial slippage between immiscible polymers

Moonprasith

Nasri

Saari

et al. 2021

Polymer Engineering & Sci

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The rheological behavior under pressure‐driven shear flow was studied using binary blends with a sea‐island structure. The addition of a low‐viscosity dispersion having a high interfacial tension with the continuous phase greatly reduces the shear viscosity, for example, the addition of atactic polystyrene (PS) with a low viscosity to isotactic polypropylene (PP) and the addition of PP with a low viscosity to PS. The interfacial slippage occurs because of the poor adhesive strength with the enlarged interfacial area and is responsible for the viscosity decrease. When the dispersion has a similar viscosity to the continuous phase, the viscosity decrease is barely detected. This is because the deformation of dispersed droplets is restricted, which creates a small interfacial area. The interfacial tension between the continuous and dispersed phases plays a crucial role on the shear viscosity. In the case of PP, the addition of linear low‐density polyethylene with a relatively low interfacial tension to PP has almost no impact on the shear viscosity. This is despite the polyethylene having a low viscosity.

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Section: Introductionmentioning

confidence: 99%