Relaxation Nuclear Magnetic Resonance Imaging Investigation of Heterogeneous Aging in a Hydroxy-Terminated Polybutadiene-Based Elastomer
Relaxation nuclear magnetic resonance imaging (R-NMRI) was employed to investigate the effects of thermooxidative aging in a hydroxy-terminated polybutadiene (HTPB)-based elastomer. A series of three-dimensional (3D) Hahn-echo-weighted single-point images (SPI) of the elastomer were utilized to gene...
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Veröffentlicht in: | Macromolecules 2005-12, Vol.38 (26), p.10694-10701 |
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Sprache: | eng |
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Zusammenfassung: | Relaxation nuclear magnetic resonance imaging (R-NMRI) was employed to investigate the effects of thermooxidative aging in a hydroxy-terminated polybutadiene (HTPB)-based elastomer. A series of three-dimensional (3D) Hahn-echo-weighted single-point images (SPI) of the elastomer were utilized to generate a 3D parameter map of the aged material. NMR spin−spin relaxation times (T 2) were measured for each voxel producing a 3D NMR parameter (T 2) map of the aged polymer. These T 2 maps reveal a dramatic reduction of local polymer mobility near the aging surface with the degree of T 2 heterogeneity varying as a function of aging. Using correlations between NMR T 2 and material modulus, the impact of this heterogeneous thermooxidative aging on the material properties is discussed. |
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ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/ma051906y |