Xh. Sun et al., SYNTHESIS OF SOLUBLE POLYIMIDES CONTAINING BIPYRIDINIUM DIHYDROGEN PHOSPHATE AND P-TOLUENESULFONATE AND EFFECT OF ANIONS ON PROPERTIES OF POLYIMIDES, Polymer, 40(2), 1999, pp. 429-437
The objective of this research was to investigate the effect of anions
on the properties of soluble polyimides containing bipyridinium salt.
Thus the work began with the synthesis of two new diamines: 1,1'-di[4
-(4-aminophenoxy) phenyl]-4,4'-(1,4-phenylene)bis(2,6-diphenyl pyridin
ium dihydrogen phosphate) and 1,1'-di[4- (4-aminophenoxy)phenyl] -4,4'
-(1,4-phenylene)bis(2,6-diphenyl pyridinium p-toluene-sulfonate). The
two new diamines were polymerized with several dianhydrides to afford
two new series of soluble polyimides. The polyimides have inherent vis
cosities that range from 0.284 to 0.449 dl g(-1) in N,N-dimethylformam
ide at 25 degrees C. These new polymers are soluble in polar aprotic s
olvents. Polymers containing H2PO4- show no glass transition temperatu
re (T-g) and the T(g)s of polymers containing p-toluenesulfonate (PTS-
) are around 240 degrees C. Thermogravimetric analysis showed that the
polymers began to decompose in the range from 390 to 419 degrees C. S
tudies showed that the solubility, T(g)s, thermal stabilities, absorpt
ion in the visible region and photosensitivities of the polymers were
affected by the basicity, structure, thermal stabilities and soft/hard
character of the anions, respectively. (C) 1998 Published by Elsevier
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