Synthesis a novel Schiff base and Chalcone derivatives compounds and using as flame retardant for unsaturated polyester and epoxy resins

Abstract

In this work, seven additives were used to reduced the flammability, namely:(1-(4-hydroxy-3-methoxyphenyl)-3-(2-hydroxy-5-(6-nitrobenzothiazoldiazenyl)phenyl)pr op-2-en-1-one)(Add. I),(3-(2-hydroxy-5-(6-nitrobenzothiazoldiazenyl)phenyl)-1-(4-hydroxyphenyl)prop-2-en-1-one)(Add. II),3-(2-hydroxy-5-(6-nitrobenzohiazoldiaze nyl) phenyl)-1-(4-methoxyphenyl)prop-2-en-1-one(Add. III), 2-((2-hydroxy-4-methyl phenyl)imino)methyl)-4-(6-nitrobenzothiazoldiazenyl)phenol(Add. IV),2-(6-methyl pyridin-2-yl)imino)methyl)-4-(6-nitrobenzothiazoldiazenyl)phenol(Add. V) and 2-(4-chlo rophenyl)imino)methyl)-4-(6-nitrobenzothiazol-2-yl)diazenyl)phenol (Add. VI). The effects of these additives on flammability of some types of the thermosetting polymers (unsaturated polyester and epoxy resins), have been studied. Sheets of the specimens (resins with different weight percentages of additives), in dimensions (150×150×3) mm were prepared. Two standard test methods used to measure the flame retardation which are: (ASTM: D-2863) and (ASTM: D-635). Results are obtained from these tests indicated that, additive (Add. VI) has high efficiency as flame retardant, self-extinguishing (S.E.) at the percentage (0.1 %) for unsaturated polyester and the epoxy resins. Also self extinguishing (S.E.) at the percentage (0.1%) for additives (Add. I), (Add. IV) and (Add. V), in unsaturated polyester resin and non-burning occurs in (0.15%) with Additive (Add.VI) and (Add. V) in unsaturated polyester resin but it is occur in (0.2%) with additives (Add. VI) and (Add. V) in epoxy resin.