Magnetic resonance imaging of solvent transport in polymer networks

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The spectroscopic technique of magnetic resonance imaging (MRI) has recently provided a new window into transport of solvents in polymer networks. Diffusion of solvent as a rate-controlling phenomenon is paramount to understanding transport in many important industrial and biological processes, such as upgrading fossil fuels, film casting and coating, development of photoresists, design of drug-delivery systems, development of solvent resistant polymers, etc. By MRI mapping the migration of solvent molecules through various polymer specimens, researchers Robert Botto and George Cody of Argonne National Laboratory, with support from the Division of Chemical Sciences at DOE, were able to characterize and distinguish ... continued below

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6 p.

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Botto, R.E. & Cody, G.D. February 1, 1995.

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Description

The spectroscopic technique of magnetic resonance imaging (MRI) has recently provided a new window into transport of solvents in polymer networks. Diffusion of solvent as a rate-controlling phenomenon is paramount to understanding transport in many important industrial and biological processes, such as upgrading fossil fuels, film casting and coating, development of photoresists, design of drug-delivery systems, development of solvent resistant polymers, etc. By MRI mapping the migration of solvent molecules through various polymer specimens, researchers Robert Botto and George Cody of Argonne National Laboratory, with support from the Division of Chemical Sciences at DOE, were able to characterize and distinguish between different modes of transport behavior associated with fundamentally different types of polymer systems. The method was applied to rubbers, glassy polymers, and coals. In polymers shown to undergo a glass transition from a rigid to rubbery state, a sharply defined solvent front was observed that propagated through specimens in the manner of a constant velocity shock wave. This behavior was contrasted with a smooth solvent concentration gradient found in polymer systems where no glass transition was observed. The results of this analysis have formed the basis of a new model of anomalous transport in polymeric solids and are helping to ascertain fundamental information on the molecular architectures of these materials.

Physical Description

6 p.

Notes

OSTI as DE95007142

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  • Other Information: PBD: [1995]

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  • Other: DE95007142
  • Report No.: ANL/CHM/PP--80411
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/26588 | External Link
  • Office of Scientific & Technical Information Report Number: 26588
  • Archival Resource Key: ark:/67531/metadc667827

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  • February 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 14, 2015, 5:04 p.m.

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Botto, R.E. & Cody, G.D. Magnetic resonance imaging of solvent transport in polymer networks, report, February 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc667827/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.