Abstract
A series of main-chain thermotropic polyesters which have an alternating sequence of mesogenic units and polymethylene spacers as well as their model compounds with two terminal mesogenic units and central spacers were prepared. Their liquid crystalline behavior, especially their thermal transition properties and nature of mesophases were compared with each other. The polymers and the low molecular weight model compounds exhibited in their transition temperatures distinctive odd-even dependence on the number of methylene units in the spacer. All of them formed nematic mesophases in melts. The liquid crystalline properties of the polymers and the model compounds were studied by differential scanning calorimetry and on the hot-stage of a polarizing microscope.
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Jin, JI., Choi, EJ., Ryu, SC. et al. Thermotropic Main Chain Polyesters with Polymethylene Spacers and Their Low Molecular Weight Model Compounds—Odd-Even Effect of Polymethylene Spacers. Polym J 18, 63–70 (1986). https://doi.org/10.1295/polymj.18.63
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DOI: https://doi.org/10.1295/polymj.18.63