Kc. Chuang et al., RIGID-ROD POLYIMIDES BASED ON NONCOPLANAR 4,4'-BIPHENYLDIAMINES - A REVIEW OF POLYMER PROPERTIES VS CONFIGURATION OF DIAMINES, Macromolecules, 30(23), 1997, pp. 7183-7190
X-ray crystal structures of three substituted 4,4'-biphenyldiamines, n
amely, 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 phi = 83 degrees, 75 degrees, and 59 degrees, respectively. A
structure-property relationship between the three-dimensional configu
ration of diamine monomers End the corresponding polyimides is discuss
ed.