Chain extension of ketonic resins

Abstract

AbstractChain extensions of cyclohexanone‐formaldehyde (CF) and acetophenone‐formaldehyde (AF) resins via their hydroxyl groups were studied. The chain extension was regulated by the ratio of hydroxyl groups/reactive reagents. Dimethyl dichlorosilane, phosphorus oxychloride, toluene‐2, 4‐diisocyanate, phthalic anhydride, tetrahydro phthalic anhydride, trimellitic anhydride, 4, 4'‐oxydiphthalic anhydride were used as chain extender reagent. It has been shown that solubilites, melting point and molecular weight of extended resins depended upon the characteristics of chain extender reagents.