| Acoustic properties of Kel F-800 copolymer up to 85 GPa. | |
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MedLine Citation:
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PMID: 22779672 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Acoustic properties of the fluorinated copolymer Kel F-800 were determined with Brillouin spectroscopy up to pressures of 85 GPa at 300 K. This research addresses outstanding issues in high-pressure polymer behavior, as to date the acoustic properties and equation of state of any polymer have not been determined above 20 GPa. We observed both longitudinal and transverse modes in all pressure domains, allowing us to calculate the C(11) and C(12) moduli, bulk, shear, and Young's moduli, and the density of Kel F-800 as a function of pressure. We found the behavior of the polymer with respect to all parameters to change drastically with pressure. As a result, we find that the data are best understood when split into two pressure regimes. At low pressures (less than ∼5 GPa), analysis of the room temperature isotherm with a semi-empirical equation of state yielded a zero-pressure bulk modulus K(o) and its derivative K(0) (') of 12.8 ± 0.8 GPa and 9.6 ± 0.7, respectively. The same analysis for the higher pressure data yielded values for K(o) and K(0) (') of 34.9 ± 1.7 GPa and 5.1 ± 0.1, respectively. We discuss this significant difference in behavior with reference to the concept of effective free volume collapse. |
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Authors:
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Ari S Benjamin; Muhtar Ahart; Stephen A Gramsch; Lewis L Stevens; E Bruce Orler; Dana M Dattelbaum; Russell J Hemley |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of chemical physics Volume: 137 ISSN: 1089-7690 ISO Abbreviation: J Chem Phys Publication Date: 2012 Jul |
Date Detail:
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Created Date: 2012-07-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375360 Medline TA: J Chem Phys Country: United States |
Other Details:
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Languages: eng Pagination: 014514 Citation Subset: IM |
Affiliation:
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Department of Physics, Williams College, Thompson Physics Laboratory, 33 Lab Campus Drive, Williamstown, Massachusetts 01267, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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