Study of Influence of Copolymer Vinyl Chloride and Vinyl Acetate on the Properties of Butadiene Nitrile Rubber

Influence of a copolymer of vinyl chloride and vinyl acetate to the properties of butadiene nitrile rubber has been studied. It is shown that the growth of the molecular weight of BNR by mixing latex rubber and copolymer in a ratio 80:20, 75:25, 65:35 leads to obtaining micro heterogeneous systems. Copolymer initially acts as an interstructural amplifier and then depending on their ratio plays the role of the dispersed phase in the plasticization. By the method of rheological analysis it was found out that increase of molecular weight was observed in the interval time (0-90 min), characteristic viscosity increases with the ratio of 75:25 copolymer from 0.6 to 1.4. A sol-gel analysis showed that with increase in the concentration of the copolymer in BNR the number of chains grid (1/Ms) in the rubber decreases. It was found out that consumption of cross linked molecules (1/Mn) for the cross-linking is reduced, it becomes constant at a ratio of 100:65:25. Comparison of the kinetics of thermometallic oxide vulcanization of BNR with the accelerator disulphide chloride benzene (DSCB) increases the yield concentration of the effective cross-links (n `c) in the molecule BNR. Experiment showed that in the presence of the accelerator DSCB and zinc oxide the structuring mainly goes by the double bond.