Abstract
Main-chain liquid crystalline PB-18 polyester composed of 4,4'-dihydroxybiphenyl and octadecanedioic acid forms two distinct crystalline phases, K 1 and K 2, and smectic H ( S H) phase in the order of increasing temperature. The detailed structures of the three phases were studied by 13C solid-state NMR spectroscopy with variable temperature accessories. With a comparison of the observed 13C chemical shifts to the calculated 13C NMR shieldings by FPT-INDO method, the conformations of the mesogenic moiety and alkylene spacer are discussed among these three phases.
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