R. W. Thies, G. Collins, Turgay Sekin
Jul 1, 1992
Citations
0
Influential Citations
7
Citations
Journal
Macromolecules
Abstract
Two synthetic routes were studied that use nucleophilic aromatic disubstitution of 2,2-bis(4-hydroxyphenyl)propane either with 5-chloro-2,1,3-benzodithiazole or with 5-chloro-2-nitroaniline. Subsequent reductions lead to the tetraamine 2,2-bis[4-(3,4-diaminophenoxy)phenyl]propane that was converted to the corresponding polybenzimidazole by an oxidative heteroaromatization reaction with isophtalaldehyde. Conditions are described which provide η inh = 0.47-0.97 dL/g and tough, flexible films.