(a) Calculate the mole fraction composition of the initial terpolymer which would be formed from the radical polymerization of a feed containing 0.414 mole fraction methacrylonitrile (M1), 0.424 mole fraction styrene (M2), and 0.162 mole fraction a-methyl styrene (M3). (b) What fraction of styrene sequences in this copolymer contain 2 or more styrene units ? Data M/M2 : r1 = 0.44, r2 = 0.37; M1/M3: r1 = 0.38, r2 = 0.53; M2/M3: 1 = 1.124, r2 = 0.627.] [Ans. (a) Fi = 0.443, F2 = 0.403, F3 = 0.154; (b) 0.23] %3D %3D %3D

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