In our study the effects of various factors in the reaction of chlorination and copolymerization of fatty acid wastes were investigated and optimum conditions were determined. The first purpose of this study is to investigate the electrochemical chlorination reaction of fatty acid wastes in the electrolysis of HCl, then to obtain composite materials by the products of this reaction, and finally to determine physicomechanical properties, heat resistance, and the effect of chloride to the fire strength of these composite materials. At that time the glycide ester of fatty acid (GEF) was synthesized and used as modificator for the determination of thermal and heat properties of composite materials. And the properties of composite materials that are obtained were compared. Styrene-fatty acid copolymers (SFC) were also synthesized by interacting wasted product with styrene. Molecular weight of copolymer, number of carboxyl groups in its structure, its adhesion capability and thermal properties were investigated. (C) 2008 Wiley Periodicals, Inc.