New bisamides gelators: relationship between chemical structure and fiber morphology
摘要:
Different dialkoxybenzoic acid derivatives with identical alkyl chain lengths were synthesized and their properties as organogelators evaluated. Only the compounds bearing amide groups behave like gelators. Their gelation abilities and phase diagrams were described. A structural study was conducted by freeze-fracture electron microscopy and showed that the methyl ester formed platelet-like aggregates whereas the corresponding free acid formed thin fibers in the gel. (C) 2003 Elsevier Science Ltd. All rights reserved.
A facile synthetic route affording polycondensable monomers containing alkyl chains connected to a rigid aromatic core allowing chain folding was developed. The stepwise condensation of the monomer was shown to afford dimer, tetramer and was further proved to be applicable to higher oligomers. Such oligomers composed of "tinker toy" building blocks may be of interest for inducing controlled conformations in nanostructured materials. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.