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- W9100976 abstract "The polyimides LaRC-TPI, LaRC-IA and LaRC-SI and related model compounds were investigated using 13C and 1H nuclear magnetic resonance (NMR). Magic angle spinning was used to acquire 13C isotropic chemical shift spectra of these materials. The spectra were assigned as completely as possible. In addition, the principal components of some shielding tensors were measured using variable angle correlation spectroscopy (VACSY). Of those studied, LaRC-SI is the only polymer that is soluble. However, after it is heated past its glass transition temperature, LaRC-SI becomes insoluble. Experiments were performed in an attempt to identify causes of this behavior. When magnetization from nuclei in rigid regions of the polymer is suppressed, the 1H and 13C NMR spectra of soluble LaRC-SI are significantly different from those of insoluble LaRC-SI. Hydration studies of LaRC-SI show that absorbed water plasticizes the polymer." @default.
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- W9100976 date "1998-09-01" @default.
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- W9100976 title "Characterization of polyimides by and solid state nuclear magnetic resonance" @default.
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- W9100976 doi "https://doi.org/10.1016/s0926-2040(98)00054-x" @default.
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