Rigid-Rod Polyimides Based on Noncoplanar 4,4‘-Biphenyldiamines: A Review of Polymer Properties vs Configuration of Diamines
journal contributionposted on 17.11.1997, 00:00 by Kathy C. Chuang, James D. Kinder, Diana L. Hull, David B. McConville, Wiley J. Youngs
X-ray crystal structures of three substituted 4,4‘-biphenyldiamines, namely, 2,2‘,6,6‘-tetramethylbenzidine (TMBZ), 2,2‘-dimethylbenzidine (DMBZ) and 2,2‘-bis(trifluoromethyl)benzidine (BFBZ), were determined. The torsional angles between the two phenyl rings for TMBZ, DMBZ, and BFBZ are φ = 83°, 75°, and 59°, respectively. A structure−property relationship between the three-dimensional configuration of diamine monomers and the corresponding polyimides is discussed.