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In: Chemistry

The reactivity of a combination of monomers depends a great deal on the nature of the...

The reactivity of a combination of monomers depends a great deal on the nature of the polymerizing center. For example, the reactivity ratios of butadiene (1) and styrene (2) are quite different in an anionic copolymerization (r1 = 5, r2 = 0.04) and in a radical copolymerization (r1 = 1.39, r2 = 0.78). If a copolymerization is performed with a 50/50 mixture of the two, what are the initial compositions of the polymers formed in the two different copolymerization reactions?

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Expert Solution

For the anionic copolymerization, the mole fractions  of butadiene and styrene in the copolymer composition are respectively F1 = 0.85 and F2 = 0.15 .

For the radical polymerization, the mole fractions of butadiene and styrene in the copolymer composition are respectively F1 = 0.56 and F2 = 0.44 .

The detail calculation is shown below.

queen_honey_blossom answered 3 months ago
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