EFFECT OF GAMMA IRRADIATION ON THE CROSSLINKING PROCESS OF NITRILE- BUTADIENE RUBBER WITH TRIAZINE AND MALEIC COMPOUNDS

Abstract

The effect of γ-irradiation on the crosslinking process of nitrile butadiene rubber (NBR) with the participation of 4-dichloro 6-diethylamino-simmtriazine (DChDEAST) and 2,4- dimethylphenyl maleimide (DMPhM) was investigated. The molecular structure of the binary systems NBR + DChDEAST and NBR + DMPhM was determined by Fourier spectroscopy. Fourier transform infrared spectroscopy (FTIR) was used to determine the molecular structure of binary composite systems NBR + DChDEAST and NBR + DMPhM. The relative concentration of double bonds was predicted by determining its absorption by the optical density at the maximum absorption (967, 912 and 750 cm-1 ). It was found that at radiation doses above 250 kGy, the the number of crosslinks in irradiated blends were 1.05 × 104 and 0.66 × 104 mol /cm3 , respectively. The sensitizing effects of triasine and maleic compounds in radiation-chemical processes was investigated as well. Comprehensive studies of the structure and spatial network parameter of crosslinked NBR showed that the introduction of low molecular weight triazine and maleimide compounds increase the radiation-chemical yield (Gc) and this process also affect to increase the number of crosslinked molecules (1/Mnτ) and molecular weight of elastomers in turn.