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Title: Solution properties of a CO{sub 2}-soluble fluoropolymer via small angle neutron scattering

Abstract

In this communication, we report the first characterization of solutions of a high molecular weight polymer in supercritical CO{sub 2} by small-angle neutron scattering (SANS). It is shown that small-angle neutron scattering gives key molecular parameters of an amorphous fluoropolymer in supercritical CO{sub 2}, i.e., the molecular weight, radius of gyration, and second virial coefficient, and thereby gives insights into a polymer chain`s behavior in this unique solvent. The positive sign of the second virial coefficients indicate that this medium is a good solvent - there is no evidence of a collapsed chain conformation. In fact, we conclude from the SANS data that, in CO{sub 2}, the poly(FOA) chain dimensions are expanded relative to those characteristic of its melt. 29 refs., 2 figs., 1 tab.

Authors:
; ; ; ; ; ;  [1]; ;  [2]
  1. Univ. of North Carolina, Chapel Hill, NC (United States)
  2. Oak Ridge National Lab., TN (United States)
Publication Date:
OSTI Identifier:
232479
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Journal Article
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 118; Journal Issue: 4; Other Information: PBD: 31 Jan 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 40 CHEMISTRY; 66 PHYSICS; POLYMERS; NEUTRON DIFFRACTION; STRUCTURAL CHEMICAL ANALYSIS; ORGANIC FLUORINE COMPOUNDS; CARBON DIOXIDE; SOLUTIONS; SUPERCRITICAL STATE; SOLUBILITY; DATA ANALYSIS; ACRYLATES

Citation Formats

McClain, J B, Combes, J R, Romack, T J, Canelas, D A, Betts, D E, Samulski, E T, DeSimone, J M, Londono, D, and Wignall, G D. Solution properties of a CO{sub 2}-soluble fluoropolymer via small angle neutron scattering. United States: N. p., 1996. Web. doi:10.1021/ja952750s.
McClain, J B, Combes, J R, Romack, T J, Canelas, D A, Betts, D E, Samulski, E T, DeSimone, J M, Londono, D, & Wignall, G D. Solution properties of a CO{sub 2}-soluble fluoropolymer via small angle neutron scattering. United States. https://doi.org/10.1021/ja952750s
McClain, J B, Combes, J R, Romack, T J, Canelas, D A, Betts, D E, Samulski, E T, DeSimone, J M, Londono, D, and Wignall, G D. Wed . "Solution properties of a CO{sub 2}-soluble fluoropolymer via small angle neutron scattering". United States. https://doi.org/10.1021/ja952750s.
@article{osti_232479,
title = {Solution properties of a CO{sub 2}-soluble fluoropolymer via small angle neutron scattering},
author = {McClain, J B and Combes, J R and Romack, T J and Canelas, D A and Betts, D E and Samulski, E T and DeSimone, J M and Londono, D and Wignall, G D},
abstractNote = {In this communication, we report the first characterization of solutions of a high molecular weight polymer in supercritical CO{sub 2} by small-angle neutron scattering (SANS). It is shown that small-angle neutron scattering gives key molecular parameters of an amorphous fluoropolymer in supercritical CO{sub 2}, i.e., the molecular weight, radius of gyration, and second virial coefficient, and thereby gives insights into a polymer chain`s behavior in this unique solvent. The positive sign of the second virial coefficients indicate that this medium is a good solvent - there is no evidence of a collapsed chain conformation. In fact, we conclude from the SANS data that, in CO{sub 2}, the poly(FOA) chain dimensions are expanded relative to those characteristic of its melt. 29 refs., 2 figs., 1 tab.},
doi = {10.1021/ja952750s},
url = {https://www.osti.gov/biblio/232479}, journal = {Journal of the American Chemical Society},
number = 4,
volume = 118,
place = {United States},
year = {1996},
month = {1}
}