Synthesis and properties of organosoluble polyimides based on novel perfluorinated monomer hexafluoro-2,4-toluenediamine
作者:Inna K. Shundrina、Tamara A. Vaganova、Soltan Z. Kusov、Vladimir I. Rodionov、Elena V. Karpova、Evgenij V. Malykhin
DOI:10.1016/j.jfluchem.2011.01.008
日期:2011.3
New highly fluorinated aromatic polyimides based on hexafluoro-2,4-toluenediamine and commercially available dianhydrides (6FDA and ODPA) were synthesized by one-pot high temperature polycondensation in benzoic acid melt. Owing to the CF3 group and fluorine atoms in the meta-linked phenylenediamine fragment, these polyimides combine good solubility in organic solvents including such a low boiling point
Perfluorinated polyimide, perfluorinated poly(amic acid), starting compounds therefor, and methods for preparing them
申请人:NIPPON TELEGRAPH AND TELEPHONE CORPORATION
公开号:EP0480266A2
公开(公告)日:1992-04-15
A perfluorinated polyimide having a repeating unit represented by general formula (1):
and a perfluorinated poly(amic acid) having a repeating unit represented by general formula (6):
wherein R1 is a tetravalent organic group; and R2 is a divalent organic group, provided that chemical bonds between carbon atoms and monovalent elements contained in R1 and R2 are exclusively carbon-to-fluorine bonds; methods for preparing them; and an optical material including the perfluorinated polyimide. 1,4-Bis(3,4-dicarboxytrifluorophenoxy)tetrafluorobenzene dianhydride, 1,4-difluoropyromellitic anhydride, 1,4-bis(3,4-dicar- boxytrifluorophenoxy)tetrafluorobenzene, 1,4-difluoro-pyromellitic acid, and 1,4-bis(3,4-dicyanotrifluorophenoxy)-tetrafluorobenzene as well as methods preparing them. The perfluorinated polyimide has a thermal stability and has a low optical loss in an optical communication wavelength region (1.0 to 1.7 mm).
Design of zigzag-like supramolecular 1D assemblies of polyfluorinated meta-arylenediamines and 18-crown-6
作者:Tamara A. Vaganova、Soltan Z. Kusov、Inna K. Shundrina、Yurij V. Gatilov、Evgenij V. Malykhin
DOI:10.1016/j.molstruc.2011.03.067
日期:2011.5
According to the X-ray crystal data, 1D assemblies formed by alternate arylenediamine and crown ether molecules are the motif of the supramolecular architecture of crystal associates of 18-crown-6 and polyfluorinated rneta-arylenediamines, i.e. 2,4,5-trifluoro-, tetrafluoro-, 2,5,6-trifluoro-4-trifluoromethyl-, 2,5-difluoro-4,6-bis(trifluoromethyl)-1,3-phenylenediamines, and hexafluoro-2,7-naphthylenediamine. Molecules in the assemblies are coordinated by means of the hydrogen bond between the oxygen atoms of the crown ether and the hydrogen atoms of the polyfluoroarene amino groups. Due to the mutual meta-location of amino groups in a rigid aromatic framework, the molecules of the each component are arranged in a zigzag line along the rod axis. The zigzag arrangement of components in the 1D assemblies and the supramolecular architecture of co-crystals persist when the aromatic framework size increases and when one or two bulky CF3 groups are incorporated into ortho-positions to the amino groups. Using differential scanning calorimetry (DSC), specific melting heats of co-crystals have been determined, which trend towards a decrease with an increase of the 1D assembly unit lengths. (C) 2011 Elsevier B.V. All rights reserved.