Relaxation Nuclear Magnetic Resonance Imaging Investigation of Heterogeneous Aging in a Hydroxy-Terminated Polybutadiene-Based Elastomer

Autor:	Todd M. Alam, Brian Ray Cherry, Mat C. Celina, Kevin R. Minard
Rok vydání:	2005
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics Organic Chemistry Relaxation (NMR) Solid-state Modulus Polymer Elastomer Inorganic Chemistry Spin–spin relaxation Nuclear magnetic resonance Polybutadiene chemistry Materials Chemistry Material properties
Zdroj:	Macromolecules. 38:10694-10701
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma051906y
Popis:	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 (T2) were measured for each voxel producing a 3D NMR parameter (T2) map of the aged polymer. These T2 maps reveal a dramatic reduction of local polymer mobility near the aging surface with the degree of T2 heterogeneity varying as a function of aging. Using correlations between NMR T2 and material modulus, the impact of this heterogeneous thermooxidative aging on the material properties is discussed.
Databáze:	OpenAIRE
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