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• W2057156419 endingPage "5482" @default.
• W2057156419 startingPage "5475" @default.
• W2057156419 abstract "A main-chain nonracemic chiral liquid crystalline polymer was synthesized from (R)-(−)-4‘-{ω-[2-(p-hydroxy-o-nitrophenyloxy)-1-propyloxy]-1-decyloxy}-4-biphenylcarboxylic acid. This polymer contained 10 methylene units in each chemical repeating unit and was abbreviated PET(R*-10). On the basis of differential scanning calorimetry, wide-angle X-ray diffraction, and polarized light microscopy experiments, chiral smectic C (SC*) and chiral smectic A (SA*) phases were identified. Both flat−elongated and helical lamellar crystal morphologies were observed in transmission electron microscopy. Of particular interest was the flat−elongated lamellar crystals were constructed via microtwinning of an orthorhombic cell with dimensions of a = 1.42 nm, b = 1.28 nm, and c = 3.04 nm. On the other hand, the helical lamellar crystals were exclusively left-handed, which was opposite to the right-handed helical crystals grown in PET(R*-9) and PET(R*-11) (having 9 and 11 methylene units, respectively). Note that these three polymers had identical right-handed chiral centers (R*-). Therefore, a single methylene unit difference on the polymer backbones on an atomic length scale substantially changed the chirality of the crystals in the micrometer length scale. Furthermore, aggregates of these helical crystals in PET(R*-10) did not generate banded spherulites in polarized light microscopy. Possible reasons for this change and loss of helical senses (handedness) on different length scales in chirality transferring processes were discussed." @default.
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• W2057156419 date "2002-06-04" @default.
• W2057156419 modified "2023-10-17" @default.
• W2057156419 title "Liquid Crystalline Phases, Microtwinning in Crystals and Helical Chirality Transformations in a Main-Chain Chiral Liquid Crystalline Polyester" @default.
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• W2057156419 doi "https://doi.org/10.1021/ma0204453" @default.
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