Andreas C. Cangellaris, Karen M. Coperich, et al.
EMC 2001
The polyimide poly[N, N′-(p-phenylene)-3,3′,4,4′-biphenyltetracarboxylic acid diimide] (BPDA-PDA) is used as a dielectric material in the electronics industry. Although the imidized polymer is insoluble in any organic solvent, the precursor polyamic acid is soluble in amide-type solvents or dimethyl sulfoxide (DMSO). A series of 10 polymers from the polycondensation of 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride (BPDA) and p-phenylenediamine (PDA) with 4800 < Mw < 75 000 have been synthesized by controlling the stoichiometry. The solution properties were investigated in NMP (AT-methylpyrrolidinone) and DMSO by using low-angle light scattering, viscometry, and size exclusion chromatography with a light scattering detector. Estimates of the molecular flexibility from the dilute solution properties are compared with those calculated based on a freely rotating model. © 1991, American Chemical Society. All rights reserved.
Andreas C. Cangellaris, Karen M. Coperich, et al.
EMC 2001
Thomas E. Karis, C. Mark Seymour, et al.
Rheologica Acta
I.K. Pour, D.J. Krajnovich, et al.
SPIE Optical Materials for High Average Power Lasers 1992
Daniel J. Coady, Amanda C. Engler, et al.
ACS Macro Letters