Abstract
The invention relates to a water-soluble self-acid-doped polyaniline derivatives and in particular, to a water-soluble self-acid-doped polyaniline derivatives obtained by reacting polyaniline derivatives with 2-sulfobenzoic anhydride derivatives, which is composed of structural unit having following formula (I): STR1 wherein, M may be H, Na, K or NH.sub.4 ; R.sub.1, R.sub.2, R.sub.3, R.sub.4 may be --H, --R.sub.o, --F, --Cl, --Br, --OR.sub.o, --COR.sub.o, --OCOR.sub.o, --NHCOR.sub.o, --NO.sub.2, --COOR.sub.o, --CN, --COOH; Q may be --H, --Ro, --F, --Cl, --Br, --OR.sub.o, --COR.sub.o, --OCOR.sub.o, --NHCOR.sub.o, --NO.sub.2, --COOR.sub.o, --CN, --COOH; R.sub.o is a C.sub.1 -C.sub.4 alkyl; n is an integer of 0 to 4; and x+y+2z.ltoreq.1.0, and x.gtoreq.0.1;
and a process for preparing the same.
The water-soluble self-acid-doped polyaniline derivatives exhibits some characteristics as follows:
(1) a high water solubility;
(2) a self-acid-doped property;
(3) a high conductivity which may be up to 10.sup.-3 -10.sup.-4 S/cm; and
(4) an easy synthetic procedure.
The invention relates also a process for preparing the above-said N-2-sulfobenzoic anhydride-substituted polyaniline derivatives by reacting polyaniline derivatives with 2-sulfobenzoic anhydride derivatives in a solvent and, optionally, in the presence of a catalyst, and precipitating and drying the reaction product.