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9.2 Using the reactivity ratios given in Table 9.1 and the terminal-model copolymer composition equation to calculate data points, plot the variation of copolymer composition with comonomer composition (as in Figure 9.1) for copolymerization of methyl methacrylate with (a) styrene, (b) methyl acrylate and (c) vinyl acetate. Discuss the curves in relation to control of copolymer composition drift for each of these copolymerizations. TABLE 9.1 Some Typical Values of Reactivity Ratios for Free- Radical Copolymerization at 60C FIGURE 9.1 Plots of Equation 9.7 showing the variation of copolymer composition FA with comonomer composition fA for different pairs of rA,rB values