Studies on the modification of poly(ω‐bromoalkyl‐1‐glycidylether)s with 4′‐methoxybiphenyl‐4‐oxy mesogenic groups

Abstract

A series of poly[ω‐(4′‐methoxy‐biphenyl‐4‐oxy)alkyl‐1‐glycidylether]s were synthesized by chemically modifying the corresponding poly(ω‐bromoalkyl‐1‐glycidylether)s with the sodium salt of 4‐hydroxy‐4′‐methoxybiphenyl. New high‐molecular‐weight side‐chain liquid‐crystalline polymers were obtained with excellent yields and almost quantitative degrees of modification. They were all insoluble in THF and other common solvents. Characterization by 13C NMR confirmed that all the polymers had the expected structure. The liquid crystalline behavior of the polymers was analyzed by DSC and polarized optical microscopy, and mesophase assignments were confirmed by X‐ray diffraction studies. Polymers that had alkyl spacers with n = 2 and 4 were smectic C, those that had spacers with n = 6 and 8 were nematic cybotactic, and those that had longer spacers (n = 10 and 12) were smectic C again. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 5998–6006, 2005

Long- and Short-Range Order in the Mesophases of Laterally Substituted Calamitic Mesogens and their Radial Octapodes

“…Similar four-spot reflections have been reported in several instances of conventional, low molar mass nematics – and also for oligomeric and polymeric nematics. ,– They often appear as pretransitional manifestations of a smectic-C phase in the low-temperature end of the nematic phase. This is clearly not applicable in the present case since neither of the two compounds has a stable smectic-C phase and, moreover, the reflections are not pretransitional as they span the entire nematic range.…”

Gold‐Catalyzed Intermolecular Addition of Carbonyl Compounds to 1,6‐Enynes: Reactivity, Scope, and Mechanistic Aspects

“…The conditions used in this work (anhydrous THF as a solvent, stoichiometric amounts of TBAB, and 60 °C) were selected on the basis of our experience in polymer halogen nucleophilic displacements. Under these conditions and with reactions of up to 4 days, modification degrees with various substrates and nucleophiles were high and even almost quantitative 43–45. In this way, the PECH solution in THF was heated with different ratios of potassium carboxylates in the presence of a stoichiometric amount of TBAB.…”

Self‐organized liquid‐crystalline polyethers obtained by grafting tapered mesogenic groups onto poly(epichlorohydrin): Toward biomimetic ion channels 2

“…The conditions used here (anhydrous THF as a solvent, stoichiometric amounts of TBAB, and 60 °C) were selected on the basis of our experience in polymer halogen nucleophilic displacements. Under these conditions and with reactions of up to 4 days, modification degrees with various substrates and nucleophiles were high and almost quantitative 32–34. In this way, the PECH solution in THF was heated with different ratios of potassium carboxylate in the presence of a stoichiometric amount of TBAB.…”