Thermal properties of resin copolymers derived from o-hydroxy acetophenone

A variety of crosslinked resin copolymers have been synthesized by condensing o-hydroxy acetophenone with formaldehyde and chloro-substituted benzoic acids and anilines in the presence of acidic and basic catalysts. The physico–chemical properties of the resins are reported. The thermogravimetric analysis method was used to study the thermal behaviour of the resins; the evolution of kinetic parameters and degradation mechanism was also investigated. Resins from chlorobenzoic acids showed clear two-step degradation neglecting moisture loss, whereas those from chloro anilines gave a somewhat continuous sigmoid. The effect of reaction conditions like monomer, molar ratio, and catalyst is also reported. © 1993 John Wiley & Sons, Inc.