|Title||Crystal Structure and Thin Film Morphology of BBL Ladder Polymer|
|Publication Type||Journal Article|
|Year of Publication||1995|
|Authors||H.H. Song, A.V. Fratini, M.L. Chabinyc, G.E. Price, A.K. Agrawal, C.S., J. Burkette, D.S. Dudis, and F.E. Arnold|
|Date Published||MAR 1|
Crystal structure and morphology of poly[7-oxo-7H-benz(d,e)imidazo(4',5':5,6)-benzimidazo(2,1-a)isoquinoli ne-3,4:10,11-tetrayl)-10-carbonyl] (BBL) ladder-like polymer were studied. The polymer forms a two-dimensional lattice of nematic liquid crystalline structure, An orthorhombic unit cell with cell parameters of a = 7.87 b = 3.37 c = 11.97 Angstrom was determined from the fiber diffraction pattern. In thin films, the rigid chains spontaneously form a layered structure across the film thickness, but in a very unusual manner, i.e. the very large molecular plane is standing perpendicularly to the film surface plane. The results are identical to our recent results of poly (p-phenylene benzobisthiazole) (PBT) film. The polymer, however, lost its anisotropic order upon extrusion into a film and resulted in a fiber-like structure.