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SUMMARY APPLICATION OF THE DESIGN OF EXPERIMENTS  IN THE PREPARATION OF RUBBER BLENDS BASED ON NBR, CR AND PVC The preparation of rubber blends which aims at having higher properties and reasonable cost, based on nitrile butadiene rubber (NBR), choloroprene rubber (CR) and PVC. By using the design of experiments, a mathematical model describing the relationship between the tensile strength y and compositions NBR (x 1 ), PVC (x 2 ), CR (x 3 ) has been found. It has a form as follow: y =  14.2664x 1 –  5.7154x 2 + 13.028x 3 + 2.0824x 1 x 2 + 25.1865x 1 x 3 + 0.925x 2 x 3 + 262.3118x 1 x 2 x 3 in the range of the variables : 0.2 ≤ x 1 ≤ 0.6; 0.1 ≤ x 2 ≤ 0.4, 0.2 ≤ x 3 ≤ 0.5, and x 1 + x 2 + x 3 = 1. The optimal conditions have been determined by the algorithm FLEXIPLEX of nonlinear programming

ÁP D NG PH NG PHÁP QUY HO CH TH C NGHI M TRONG NGHIÊN C U CH T O V T LI U BLEND BA C U T TRÊN C S NBR PVC CR