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

Journal Article · Tue Jan 30 23:00:00 EST 1996 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja952750s· OSTI ID:232479

McClain, J B; Combes, J R; Romack, T J; Canelas, D A; Betts, D E; Samulski, E T; DeSimone, J M ^[1]; Londono, D; Wignall, G D ^[2]

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1. Univ. of North Carolina, Chapel Hill, NC (United States)
2. Oak Ridge National Lab., TN (United States)

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.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 232479
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 4 Vol. 118; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
66 PHYSICS
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CARBON DIOXIDE
DATA ANALYSIS
NEUTRON DIFFRACTION
ORGANIC FLUORINE COMPOUNDS
POLYMERS
SOLUBILITY
SOLUTIONS
STRUCTURAL CHEMICAL ANALYSIS
SUPERCRITICAL STATE