Short Chain Branching Effect on the Cloud-Point Pressures of Ethylene Copolymers in Subcritical and Supercritical Propane

Short Chain Branching Effect on the Cloud-Point Pressures of Ethylene Copolymers in Subcritical and Supercritical Propane

The cloud-point pressures of copolymers of ethylene with propylene, butene, hexene, and octene in propane were measured with a variable-volume optical batch cell to investigate the effects of the number and length of branches on the phase behavior in the temperature range from 25 to 200 °C and at pr...

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Veröffentlicht in:Macromolecules 1998-04, Vol.31 (8), p.2533-2538
Hauptverfasser: Han, S. J, Lohse, D. J, Radosz, M, Sperling, L. H
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Sprache:eng
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Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
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container_end_page 2538
container_issue 8
container_start_page 2533
container_title Macromolecules
container_volume 31
creator Han, S. J
Lohse, D. J
Radosz, M
Sperling, L. H
description The cloud-point pressures of copolymers of ethylene with propylene, butene, hexene, and octene in propane were measured with a variable-volume optical batch cell to investigate the effects of the number and length of branches on the phase behavior in the temperature range from 25 to 200 °C and at pressures up to 700 bar. As the degree of branching increased in the ethylene−propylene copolymers, ethylene−butene copolymers, and ethylene−hexene copolymers, the cloud-point pressures decreased. At the same degree of branching, the cloud-point pressures decreased slightly upon increasing branch length. The copolymer SAFT (statistical association fluid theory) equation of state was found to correlate the experimental cloud-point data by adjusting the branch segment energy.
doi_str_mv 10.1021/ma971579x
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subjects Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
title Short Chain Branching Effect on the Cloud-Point Pressures of Ethylene Copolymers in Subcritical and Supercritical Propane
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