SYNTHESIS AND CHARACTERIZATION OF ANILINE-DOPED MIXED COPOLYMER RESINS .2.

Copolymer resins were synthesized by the mixed condensation of resorci nol-CH2O, resorcinol-aniline-CH2O, resorcinol-aniline-urea-CH2O, resor cinol-aniline-thiourea-CH2O, and resorcinol-aniline-urea-thiourea-CH2O with a view to develop synthetic resins having improved properties an d performance like toughness, mechanical properties, thermal resistanc e, chemical inertness, and adhesion. The resins were characterized by IR and TG analyses. The thermal analysis showed that the mixed copolym er resins have significantly better thermal stability than that of the simple phenol-CH2O, aniline-CH2O, urea-CH2O, and thiourea-CH2O resins . At 600 degrees C, only a 50% weight loss is observed, and even at 80 0 degrees C, the weight loss is about 70%. The resins are insoluble in most of the organic solvents including DMSO-d(6). They too are unaffe cted by diluted HNO3, but dissolve in concentrated HNO3. (C) 1996 John Wiley & Sons, Inc.