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Polymers containing formamidine groups, 4 . Copolyformamidines prepared from triethyl orthoformate, benzidine and various diamines
Author(s) -
Rillich Mailk,
Jehnichen Dieter,
Komber Hartmut,
Böhme Frank
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960520
Subject(s) - benzidine , triethyl orthoformate , condensation polymer , crystallinity , polymer chemistry , chemistry , polymer , phenylene , organic chemistry , crystallography , catalysis
Fully aromatic and aromatic‐aliphatic polyformamidines were prepared by high‐temperature solution polycondensation of the appropriate diamines with triethyl orthoformate (TEOF). Copolyformamidines of benzidine (4,4′‐biphenyldiamine) with p ‐phenylene and trans ‐1,4‐cyclohexylene units, respectively, showed liquid‐crystalline behaviour. Both series of copolyformamidines differ distinctly in crystallinity. This has been discussed with respect to sequence distribution, which was determined by 13 C NMR spectroscopy.