LrgpV1, Hal, Corpus, bibRecord, 000922

Prediction of the Viscoelastic Behavior of Low-Density Polyethylene Produced in High-Pressure Tubular Reactors

Identifieur interne : 000922 ( Hal/Corpus ); précédent : 000921; suivant : 000923

Prediction of the Viscoelastic Behavior of Low-Density Polyethylene Produced in High-Pressure Tubular Reactors

Auteurs : Prokopios Pladis ; Dimitrios Meimaroglou ; Costas Kiparissides

Source :

Macromolecular Reaction Engineering [ 1862-832X ] ; 2015-06.

RBID : Hal:hal-01267000

Abstract

In the open literature, there is a lack of comprehensive predictive models that can provide detailed information on the distributed molecular properties of LDPE (e.g bivariate molecular weight-long-chain distribution, seniority-priority long-chain branching distributions, etc.) produced in a high-pressure process. To address this problem, Meimaroglou and Kiparissides (2010) developed a novel kinetic-molecular topology Monte Carlo (MC) algorithm to predict the exact molecular architecture of nonlinear polyethylene chains. In the present paper, the molecular information obtained from the kinetic-topology MC algorithm is introduced into a comprehensive rheologicalmodel, the so-called ``branch on branch'' model of Das et al. (2006), to predict the rheological behavior of the LDPE melt in a high-pressure ethylene polymerization tubular reactor. The model uses an ensemble of branched polymer chains generated by the kinetic-chain topology MC algorithm to calculate several important viscoelastic properties, including the viscosity-shear rate curve, the storage and loss moduli, etc. The predictive capabilities of the new proposed computational approach, combining the solutions of kinetic, chain topology, and rheology models, are fully assessed via a direct comparison of model predictions with available experimental measurements on the molecular weight distribution, long-chain branching, and linear viscoelastic properties of two LDPE grades produced in industrial-scale reactors.

Url:

https://hal.univ-lorraine.fr/hal-01267000

DOI: 10.1002/mren.201500008

Links to Exploration step

Hal:hal-01267000

Le document en format XML

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<abstract xml:lang="en">In the open literature, there is a lack of comprehensive predictive models that can provide detailed information on the distributed molecular properties of LDPE (e.g bivariate molecular weight-long-chain distribution, seniority-priority long-chain branching distributions, etc.) produced in a high-pressure process. To address this problem, Meimaroglou and Kiparissides (2010) developed a novel kinetic-molecular topology Monte Carlo (MC) algorithm to predict the exact molecular architecture of nonlinear polyethylene chains. In the present paper, the molecular information obtained from the kinetic-topology MC algorithm is introduced into a comprehensive rheologicalmodel, the so-called ``branch on branch'' model of Das et al. (2006), to predict the rheological behavior of the LDPE melt in a high-pressure ethylene polymerization tubular reactor. The model uses an ensemble of branched polymer chains generated by the kinetic-chain topology MC algorithm to calculate several important viscoelastic properties, including the viscosity-shear rate curve, the storage and loss moduli, etc. The predictive capabilities of the new proposed computational approach, combining the solutions of kinetic, chain topology, and rheology models, are fully assessed via a direct comparison of model predictions with available experimental measurements on the molecular weight distribution, long-chain branching, and linear viscoelastic properties of two LDPE grades produced in industrial-scale reactors.</abstract>
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Prediction of the Viscoelastic Behavior of Low-Density Polyethylene Produced in High-Pressure Tubular Reactors

Prediction of the Viscoelastic Behavior of Low-Density Polyethylene Produced in High-Pressure Tubular Reactors

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Abstract

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri