Synthesis and Properties of Main Chain Discotic Liquid Crystalline Polyethers Based on Rufigallol

摘要: Two series of thermotropic main chain discotic liquid crystalline polyethers, PR4m-n, based on rufigallol were prepared starting from the symmetric tetraethers rufigallol, R4m; m and n represent number carbon atoms in side spacer segment, respectively. The turn readily by selective alkylation under controlled phase-transfer conditions. GPC analysis polymers suggested that they all moderate molecular weights, with Mn varying between 5400 17 000. length segment these polyethers was systematically varied, its effect phase transition temperatures mesophase structure examined using DSC, polarized light microscopy, X-ray diffraction. It is noticed when lengths are relatively long (n ≥ 2m), isotropization temperature (TD-i) decreases as increases, an observation accordance those previously made. However, ...