Abstract
The local motions of a mesomorphic main-chain copolyester and on hydroquinone, hydrorybenzoic acid, and isophthalic acid units were investigated by using high-resolution solid-states 13 C NMR. The 13 C chemical shift tensor parameters were determined from the spinning side band intensities. The rigid-lattice behavior was obtained from the study of model molecules in the crystalline state. At temperatures below the glass transition temperature, partial motional averaging of the chemical this tensors of the aromatic carbons has shown the existence of oscillations for both para- and meta-substituted rings
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