Synthesis and Thermal Properties Study of Copolymers Derive from (Bisphenol-A and bisphenol-S)

Abstract

In this study, resol resins were prepared from the reaction of (bisphenol-A or bisphenol-S) withformalin in the basic medium. Also copolymers of these resin prepared by using different ratios (5-25%) of polyvinyl alcohol with (bisphenol-A or bisphenol-S) with formalin in the basic medium.These resins, copolymers were characterized by FTIR and evalvated by differential scanningcalorimetry (DSC) and thermogravimetric analysis (TGA) techniques. The result from DSCthermograms shows that the glass transition temperature (Tg) for resol resin derived from bisphenol-Ais less than that derived from bisphenol-S. However, the Tg values for the cured copolymers werefound to be less than that for the resin derived from bisphenol-A and bisphenol-S.The TGA thermograms for cured resins and copolymers show more than one thermaldecomposition temperature. Also, higher rates of the char residue especially to resins and copolymersderived from bisphenol-S.