Abstract
A nonracemic chiral main-chain liquid crystalline (LC) polyester was synthesized from (R)-(−)-4‘-{ω-[2-(p-hydroxy-o-nitrophenyloxy)-1-propyloxy]-1-undecyloxy}-4-biphenylcarboxylic acid via an A−B type condensation polymerization. The polymer was abbreviated as PET(R*-11), where 11 is the number of methylene units in the chain backbone. Other PETs(R*-n) (n = 7−11) in this series were also studied. PET(R*-11) exhibited a LC chiral smectic C (SC*), a chiral smectic A (SA*), and a twist grain boundary smectic A (TGBA*) phase with increasing temperatures as identified by differential scanning calorimetry, polarized light microscopy, and wide-angle X-ray diffraction (WAXD). Flat-elongated lamellae were observed in transmission electron microscopy (TEM) for thin-film melt crystallized samples. Its crystal structure was determined to be a monoclinic basic unit cell with a = 1.03 nm, b = 0.47 nm, c = 6.43 nm, and γ = 83° via selected area electron diffraction (SAED), and these measurements were confirmed by two-di...
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