SYNTHESIS AND CHARACTERIZATION OF SOME NOVEL COPOLYMER RESINS - III

In continuation of our endeavor to develop synthetic resins of improve d properties and performance, we report here the synthesis of mixed co polymer resins by the condensation of resorcinol, aniline, and formald ehyde with ortho-, meta-, and para-phenylenediamine separately. The re sins were characterized by infrared (IR) and thermogravimetric analysi s (TGA). The mixed copolymer resins were found to have superior therma l stability over conventional phenol-CH2O and resorcinol-CH2O resins. The solubility behavior of the resins showed that they are resistant t o common solvents. However, they are soluble in concentrated Ha(2)O(4) and HNO3, but insoluble in concentrated HCl. (C) 1998 John Wiley & So ns, Inc.