| Abstract: | Abstract Splitting of resonance signal of CH2 group of spacer was observed in 13C solid state NMR spectra of liquid crystalline (LC) polyester with siioxane spacer [-OC-Pb-OOC-CH = CH-COO-Ph-COO-CH2?? Si(CH3)2-O-Si(CH3)2-CH2-O-]n in LC-state. We consider that there are two conformations of-COO-CH2-Si(CH3)2-group of spacer. These conformations are stabilized by steric interactions of CH2 groups of siioxane fragments with ortho-protons of phenylene rings of mesogene. As a result, there are hindrances to both flips of the phenylene rings and conformational transitions in the spacers. |
