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By use of an appropriate plot, evaluate the reactivity ratios for free-radical copo- lymerization of styrene with acrylonitrile. b) Expl ain why it was necessary to restrict the copolymerizations to low conversions. A 0.16 mol dm* solution (3.50 cm2) of s-butyllithium in toluene was aded to a solution of sty- ne (8.40 g) in toluene (200 cm2). After complete conversion of the styrene, isoprene (28.00 g) was added. When the isoprene had completely polymerized, the reaction was completed by addi- ion of a 0.10 mol cm-3 solution (2.80 cm3) of dichloromethane in toluene. a) Write down the reactions occurring in each stage of this reaction sequence and b) Evaluate the relevant degrees of polymerization and the corresponding molar show the structure of the final polymer. masses for the final polymer. FURTHER READING Bevington, J.C. (eds), Comprehensive Polymer Science, Vols. 3-5 (Eastmond, G.C., Ledwith, A.. u) Dorgomon Press, Qxford, U.K., 1989
By use of an appropriate plot, evaluate the reactivity ratios for free-radical copo- lymerization of styrene with acrylonitrile. b) Expl ain why it was necessary to restrict the copolymerizations to low conversions. A 0.16 mol dm* solution (3.50 cm2) of s-butyllithium in toluene was aded to a solution of sty- ne (8.40 g) in toluene (200 cm2). After complete conversion of the styrene, isoprene (28.00 g) was added. When the isoprene had completely polymerized, the reaction was completed by addi- ion of a 0.10 mol cm-3 solution (2.80 cm3) of dichloromethane in toluene. a) Write down the reactions occurring in each stage of this reaction sequence and b) Evaluate the relevant degrees of polymerization and the corresponding molar show the structure of the final polymer. masses for the final polymer. FURTHER READING Bevington, J.C. (eds), Comprehensive Polymer Science, Vols. 3-5 (Eastmond, G.C., Ledwith, A.. u) Dorgomon Press, Qxford, U.K., 1989
Patrina SchowalterLv2
18 Mar 2019