Characterization of polyimides by and solid state nuclear magnetic resonance
作者： Samuel J. Varner , Robert L. Vold , Gina L. Hoatson
DOI: 10.1016/S0926-2040(98)00054-X
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摘要: The polyimides LaRC-TPI, LaRC-IA and LaRC-SI related model compounds were investigated using 13C 1H nuclear magnetic resonance (NMR). Magic angle spinning was used to acquire isotropic chemical shift spectra of these materials. assigned as completely possible. In addition, the principal components some shielding tensors measured variable correlation spectroscopy (VACSY). Of those studied, is only polymer that soluble. However, after it heated past its glass transition temperature, becomes insoluble. Experiments performed in an attempt identify causes this behavior. When magnetization from nuclei rigid regions suppressed, NMR soluble are significantly different insoluble LaRC-SI. Hydration studies show absorbed water plasticizes polymer.
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