Nuclear Magnetic Resonance Imaging Characterization of Resistance Properties of Polymers to Solvent Diffusion

Nuclear magnetic resonance (NMR) imaging (MRI) was applied to study the penetration of aggressive fluids, used as blowing agents for thermal insulators (polyurethane). The penetration profiles of cyclopentane and fluorotrichloromethane (Freon 11 © ) were obtained through a series of NMR images taken...

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Bibliographic Details
Published in:International journal of polymer analysis & characterization 2006-05, Vol.11 (2), p.147-158
Main Authors: Maddinelli, G., Iwanski, P., Callaioli, A., Ravanetti, G. P.
Format: Article
Language:English
Subjects:
Cyclopentane
Diffusion
Fluorotrichloromethane
Freon 11
High-impact polystyrene
MRI
NMR imaging
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Summary:Nuclear magnetic resonance (NMR) imaging (MRI) was applied to study the penetration of aggressive fluids, used as blowing agents for thermal insulators (polyurethane). The penetration profiles of cyclopentane and fluorotrichloromethane (Freon 11 © ) were obtained through a series of NMR images taken dynamically during saturation of polymer rods. The applied technique allowed efficient observation of radial diffusion of the solvents. The method provides quantitative measurements of the solvent penetration rate by determining the translational diffusion coefficients D TRL . These parameters were applied in evaluating materials with different compositions, and they were useful in understanding the resistance properties to solvent aggression. Significant chemical and physical parameters influencing diffusion were identified.
ISSN:1023-666X
1563-5341
DOI:10.1080/10236660600640557