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Solution properties such as viscosity, critical concentration, radius of gyration, and activation energy in aqueous solutions are described for [BPDA/PDA]polyamic acid (PAA) and their salts with various amines (PAS). Although PAA and their salts with Bu 3 N, Hex 3 N, Oct 3 N, and pyridine, were insoluble in H 2 O, only the salt with Et 3 N (PAS(Et 3 ...
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