Effect of low molecular weight substances on the viscosity of polymer melts

Natov, M.; Dzhagarova, Ye.Khr.

doi:10.1016/0032-3950(66)90331-5

Polymer Science U.S.S.R.

1966

DOI: 10.1016/0032-3950(66)90331-5

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Effect of low molecular weight substances on the viscosity of polymer melts

M. Natov¹,

Ye.Khr. Dzhagarova²

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1971

1986

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Cited by 12 publications

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Étude des propriétés rhéologiques des mélanges de polypropylène‐polystyrène et de polystyrène‐polyéthylène basse‐densité

Deri¹,

Genillon²,

May³

1985

Angew. Makromol. Chem.

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Le but de ce travail est d'examiner les propriétés rhéologiques à l'état fondu des mélanges à base de PP/PS et LDPE/PS. Les mélanges ont été examinés dans le domaine des températures 160–210°C. Les courbes des variations de la viscosité apparente en fonction de la composition à tension et vitesse de cisaillement constante pour le PP/PS présentent un minimum, les courbes des variations du facteur de Barus en fonction de la composition passent par un maximum. Il semble que le domaine de faible viscosité est associé à un domaine de forte élasticité pour les matériaux viscoélastiques examinés.

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Étude des propriétés rhéologiques des mélanges de polypropylène‐polystyrène et de polystyrène‐polyéthylène basse‐densité

Deri¹,

Genillon²,

May³

1985

Angew. Makromol. Chem.

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Rheological properties of molten polymers. II. Two‐phase systems

Han¹,

Yu²

1971

J of Applied Polymer Sci

112

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synopsisA study is carried out for characterizing two-phase systems of molten polymers by their viscous and elastic properties. The two-phase systems chosen for study are blends of polystyrene and polypropylene, and blends of polystyrene and high-density polyethylene. For the study, measurements of wall normal stresses are made by use of a capillary melt rheometer described in part I of this series. .The concept of the "exit pressure" is used to determine the elastic properties of the two-phase polymer systems. The present study shows anomalous viscous and elastic properties of two-phase systems, which are dfficult to predict from knowing the viscous and elastic properties of their individual components. A detailed discussion is given on the state of dispersion of two incompatible polymer systems in the molten state, by presenting pictures of the microstructure of the extrudate samples. The state of dispersion appears to vary depending on the blending ratio, extrusion temperature, melt viscosities of individual components, and blending method.

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Measurement of the rheological properties of polymer melts with slit rheometer. II. Blend systems

Han¹

1971

J of Applied Polymer Sci

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synopsisA slit rheometer described in part I of this series was used for characterizing two blend systems by their viscous and elastic properties in the molten state. The blend systems chosen for study were blends of two high-density polyethylenes having widely different molecular weight distributions and blends of polystyrene and polypropylene which are incompatible in the molten state. The present study shows that blends of two highdensity polyethylenes and blends of polystyrene with polypropylene exhibit a minimum in melt viscosity and a maximum and minimum in melt elasticity (in terms of "exit pressure") a t certain blending ratios. These results confirm the author's earlier findings, which were obtained with a capillary rheometer.

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Effect of low molecular weight substances on the viscosity of polymer melts

Cited by 12 publications

References 3 publications

Étude des propriétés rhéologiques des mélanges de polypropylène‐polystyrène et de polystyrène‐polyéthylène basse‐densité

Étude des propriétés rhéologiques des mélanges de polypropylène‐polystyrène et de polystyrène‐polyéthylène basse‐densité

Rheological properties of molten polymers. II. Two‐phase systems

Measurement of the rheological properties of polymer melts with slit rheometer. II. Blend systems

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