In a free-radical polymerization of styrene in solution at 600C, carbon tetrabromide was used as a chain transfer agent. The initial concentrations of styrene and CBr4 were 1 mol/L and 0.01 mol/L, respectively. In 1 h, these concentrations dropped to 0.85 mol/L and 0.007 mol/L, respectively. What is the chain transfer constant CS for styrene/CBr4? (Neglect chain transfer to monomer, initiator, and solvent.)

In a free-radical polymerization of styrene in solution at 600C, carbon tetrabromide was used as a chain transfer agent. The initial concentrations of styrene and CBr4 were 1 mol/L and 0.01 mol/L, respectively. In 1 h, these concentrations dropped to 0.85 mol/L and 0.007 mol/L, respectively. What is the chain transfer constant CS for styrene/CBr4? (Neglect chain transfer to monomer, initiator, and solvent.)

Chemistry

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Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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Concept explainers

Polymerization Kinetics

Polymerization is a chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that diverge in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes. Polymerization is generally classified into step-growth and chain polymerization. Polymers are categorized into linear polymer and cross-linked polymers that are produced either by condensation or additional polymerization.

Question

In a free - radical polymerization of styrene in solution at 600C, carbon tetrabromide was used as a
chain transfer agent. The initial concentrations of styrene and CBr4 were 1 mol/L and 0.01 mol/L,
respectively. In 1 h, these concentrations dropped to 0.85 mol/L and 0.007 mol/L, respectively. What
is the chain transfer constant CS for styrene/CBr4? (Neglect chain transfer to monomer, initiator, and
solvent.)

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