On the use of pressure-volume-temperature data of polyethylene liquids for the determination of their solubility and interaction parameters.: An article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00082RZKS
ISBN-13978B00082RZK6
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MarketplaceUnited States 🇺🇸
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This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on May 1, 2004. The length of the article is 3466 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: Specific volumes of high-density and low-density polyethylene liquids at several elevated temperatures and pressures were measured. The measured specific volumes were then used to estimate the thermal expansion coefficients ([alpha] = [1/[upsilon]]([[[partial derivative][upsilon]]/[[partial derivative]T]])[.sub.P]) and isothermal compressibility ([beta] = [1/[upsilon]]([[[partial derivative][upsilon]]/[[partial derivative]P]])[.sub.T]) of the polymers. Two different approaches were used in which one was simply to fit the raw data by second order polynomials to obtain ([partial derivative][upsilon]/[partial derivative]T)[.sub.P] and ([partial derivative][upsilon]/[partial derivative]P)[.sub.T], while the other by the Sanchez-Lacombe (S-L) equation of state. It was found that the resultant [alpha] and [beta] obtained from the above methods differ significantly, indicating that the S-L equation of state may not be suitable for determining [alpha] and [beta] at elevated temperatures. When these two sets of [alpha] and [beta] were used to calculate the corresponding solubility parameters and then the Flory-Huggins interaction parameters ([chi]) of the polymers, the results also differ considerably. Nonetheless, [chi] obtained from the first method agrees well with the results obtained from small angle neutron scattering measurements while the S-L equation of state method does not. The current results suggest that solubility and interaction parameters obtained from pressure-volume-temperature experiments depend critically on the manner by which the data analysis is performed. Polym. Eng. Sci. 44:853-860, 2004.
Citation Details
Title: On the use of pressure-volume-temperature data of polyethylene liquids for the determination of their solubility and interaction parameters.
Author: L. Zhao
Publication:Polymer Engineering and Science (Refereed)
Date: May 1, 2004
Publisher: Society of Plastics Engineers, Inc.
Volume: 44 Issue: 5 Page: 853(8)
Distributed by Thomson Gale
From the author: Specific volumes of high-density and low-density polyethylene liquids at several elevated temperatures and pressures were measured. The measured specific volumes were then used to estimate the thermal expansion coefficients ([alpha] = [1/[upsilon]]([[[partial derivative][upsilon]]/[[partial derivative]T]])[.sub.P]) and isothermal compressibility ([beta] = [1/[upsilon]]([[[partial derivative][upsilon]]/[[partial derivative]P]])[.sub.T]) of the polymers. Two different approaches were used in which one was simply to fit the raw data by second order polynomials to obtain ([partial derivative][upsilon]/[partial derivative]T)[.sub.P] and ([partial derivative][upsilon]/[partial derivative]P)[.sub.T], while the other by the Sanchez-Lacombe (S-L) equation of state. It was found that the resultant [alpha] and [beta] obtained from the above methods differ significantly, indicating that the S-L equation of state may not be suitable for determining [alpha] and [beta] at elevated temperatures. When these two sets of [alpha] and [beta] were used to calculate the corresponding solubility parameters and then the Flory-Huggins interaction parameters ([chi]) of the polymers, the results also differ considerably. Nonetheless, [chi] obtained from the first method agrees well with the results obtained from small angle neutron scattering measurements while the S-L equation of state method does not. The current results suggest that solubility and interaction parameters obtained from pressure-volume-temperature experiments depend critically on the manner by which the data analysis is performed. Polym. Eng. Sci. 44:853-860, 2004.
Citation Details
Title: On the use of pressure-volume-temperature data of polyethylene liquids for the determination of their solubility and interaction parameters.
Author: L. Zhao
Publication:Polymer Engineering and Science (Refereed)
Date: May 1, 2004
Publisher: Society of Plastics Engineers, Inc.
Volume: 44 Issue: 5 Page: 853(8)
Distributed by Thomson Gale
