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.

Novel Novolac Phenolic Polymeric Network of Chalcones: Synthesis, Characterization, and Thermal–Electrical Conductivity Investigation

“…), 721. NMR spectra of 3c were published in the literature [ 1 ]. FTIR of 3d ( Figure S4 ) showed the characteristic bands at 3112 (C–H str.…”

“…), 849 (C–N str., Ar–NO 2 ). NMR spectra of 3d were published in the literature [ 1 ]. FTIR of 4a showed the characteristic bands for O–H at 3444 cm −1 , olefinic C–H at 2881 cm −1 , aromatic C–H at 2834 cm −1 , C=O at 1680 cm −1 , olefinic C=C at 1650 cm −1 , aromatic C=C at 1600,1527 cm −1 , and C–O at 1225 cm −1 [ 25 ].…”

“…Alkaline catalysts are used to make resole phenolic resins, whereas acidic catalysts are used to make novolac resins. The importance of all polymer materials is represented by the success of their applications in replacing traditional materials such as wood, leather, and metals [ 1 ]. Phenolic has been used in a variety of products because it can be pressure molded into a wide range of shapes with excellent surface properties [ 2 ].…”

“…Chalcone is frequently synthesized via Claisen–Schmidt condensation of benzaldehyde and acetophenone. The chalcones have played an important role as intermediate precursors in the synthesis of many heterocyclic organic derivatives [ 16 , 17 , 18 ] and the synthesis of polymeric compounds [ 1 , 19 , 20 ]. A literature survey showed that novolac phenolic polymeric networks prepared starting from chalcone precursors were not detected.…”

Synthesis and Characterization of Polyphosphonates and Polyurethanes Using Chalcone and DOPO-Chalcone as a Flame Retardant

“…Chalcones possess α,β-unsaturated ketones, which can undergo electron-transfer reactions, making them suitable for preparing phosphorus-containing polymers . Additionally, polymers of chalcone derivatives are widely used in printing materials, photocurable coatings, and the biomedical field and as flame-retardant materials. − Mani and Kathavarayan synthesized chalcone-based polyacrylamides and investigated their photo-cross-linking and flame-resistant properties . They reported that the presence of nitrogen and chalcone in the polymer backbone increases the thermal stability.…”