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

Deri, Fawaz; Genillon, R.; May, Jean‐François

doi:10.1002/apmc.1985.051340102

Cited by 5 publications

References 8 publications

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Influence de la température sur i'écoulement des polymères. Correlation pratique et mathématique de i'énergie d'activation de i'écoulement pour le polyéthylène basse‐densité, polyéthylène haute‐densité, polystyrène et d'autres polyoléfines

Deri¹,

Al-Deyab²,

Majid³

1989

Angew. Makromol. Chem.

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RESUME:Nous avons etudie les propriktes rheologiques des materiaux A l'etat fondu au moyen d'un viscosimetre A capillaire.Nous avons essay6 de relier les valeurs des energies d'activation, a vitesse et tension de cisaillement constantes, avec les valeurs de l'indice d'ecoulement .Les valeurs de l'indice d'ecoulement obtenues selon l'approche mathkmatique ne coincident pas avec les valeurs obtenues experimentalement. L'energie d'activation de LDPE est superieure a celle du HDPE en raison du volume libre de LDPE qui est plus grand. SUMMARY:The behaviour of materials has been studied in molten state. Measurements were made by a capillary viscometer. We have tried to link the values of activation energy at constant shear rate and a constant shear stress with the values of melt flow.The values of melt flow obtained according to the mathematical approach do not coincide with the values obtained experimentally. The activation energy of LDPE is superior to that of HDPE on account of the free volume of LDPE which is greater.

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Influence de la température sur i'écoulement des polymères. Correlation pratique et mathématique de i'énergie d'activation de i'écoulement pour le polyéthylène basse‐densité, polyéthylène haute‐densité, polystyrène et d'autres polyoléfines

Deri¹,

Al-Deyab²,

Majid³

1989

Angew. Makromol. Chem.

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Propriétés rhéologiques à l'état fondu de mélanges binaires de polyéthylène et de polybutène‐1

Deri¹,

Lallam

1991

Makromol. Chem.

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The dynamic rheological study on a series of binary blends obtained from low-density polyethylene and poly(1-butene) was carried out. From our results we can propose an analogical pattern which is able to simulate the rheological behaviour of the blend in the melt state. We have calculated the different parameters of the model and their variations with temperature, composition, mixing and frequency. We have demonstrated that: -The viscosity qo and the mean relaxation time ro decrease with increasing temperature, while the parameter h of the distribution of relaxation times remains independant of the temperature.-Kneading operation gives rise to a drop of the ro, qo and h values compared to those products which have not been kneaded. -The viscosity qo is the weighted sum of the blend components.-The viscosity qo of the blend is a function of the molecular weight.

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Viscoelastic behaviour in the molten state of low density polyethylene‐polybutene 1 blends

Deri

Behar

1992

Polymer International

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The viscoelastic bchaviour in thc molten statc of low density polyethylene-polybutene I blends has been studied according to temperature, shearing stress and shearing rate. Measurements were made with a capillary viscometer for the static properties and a balance-rheometer system of Kepes for the dynamic properties. Correction of experimental data has been performed and flow activation energies at a constant shear stress determined, whilst elasticity was investigated by means of the Barus factor. Furthermore, an investigation has been performed on variations of the real u' and imaginary q" parts of the complex viscosity with regard to the pulsation frequency (I). The Cole-Cole and the Smyth representations were utilised to determine the Newtonian viscosity 'lo. the parameter of distribution of relaxation time / I and the average relaxation time i,. K q , II.OI.L/;Y: Barus factor, real and imaginary part of the complex viscosity, parameter of distribution of relaxation time, average relaxation time.

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

Cited by 5 publications

References 8 publications

Influence de la température sur i'écoulement des polymères. Correlation pratique et mathématique de i'énergie d'activation de i'écoulement pour le polyéthylène basse‐densité, polyéthylène haute‐densité, polystyrène et d'autres polyoléfines

Influence de la température sur i'écoulement des polymères. Correlation pratique et mathématique de i'énergie d'activation de i'écoulement pour le polyéthylène basse‐densité, polyéthylène haute‐densité, polystyrène et d'autres polyoléfines

Propriétés rhéologiques à l'état fondu de mélanges binaires de polyéthylène et de polybutène‐1

Viscoelastic behaviour in the molten state of low density polyethylene‐polybutene 1 blends

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