What question did this study set out to answer?

To determine the kinetic parameters, initiation efficiencies, and cross-termination behavior during the copolymerization of styrene and p-methoxystyrene.

July 1, 1951Journal of Polymer Science

Studies in copolymerization. Kinetics of the copolymerization of styrene and p‐methoxystyrene

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To determine the kinetic parameters, initiation efficiencies, and cross-termination behavior during the copolymerization of styrene and p-methoxystyrene.
Conducted copolymerization experiments of styrene and p-methoxystyrene at 60°C catalyzed by the thermal decomposition of 2-azobisisobutyronitrile at 1 g/L.
Measured polymer molecular weights, overall copolymerization rates, and initiation rates across varying monomer mixture compositions.
Experimental initiation rates were 3.3 × 10⁻⁸ mol/L/s for styrene and 2.1 × 10⁻⁸ mol/L/s for p-methoxystyrene, well below the calculated radical production rate of 12.2 × 10⁻⁸ mol/L/s.
The kinetic ratio δ (kt^1/2 / kp) was 25 with kf/kp of 1.1 × 10⁻⁴ for styrene, compared to δ = 21 and kf/kp of 0.74 × 10⁻⁴ for p-methoxystyrene, yielding a styrene activation energy (Ep − 1/2Et) of 6.2 kcal.
Copolymerization rates remained practically independent of monomer composition while initiation rates varied directly, yielding a cross-termination factor of ϕ = 1.

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Implication

Kinetic analysis demonstrates constant copolymerization rates across styrene and p-methoxystyrene mixtures, indicating that entropy and polar effects govern cross-termination reactions.

Cite This Study

Bonsall et al. (1951) studied this question.

synapsesocial.com/papers/6a8fe6996419f67990277c01 https://doi.org/10.1002/pol.1951.120070104

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Implication

Kinetic analysis demonstrates constant copolymerization rates across styrene and p-methoxystyrene mixtures, indicating that entropy and polar effects govern cross-termination reactions.

Studies in copolymerization. Kinetics of the copolymerization of styrene and p‐methoxystyrene

Key Points

Discussion

Implication

Cite This Study

Studies in copolymerization. Kinetics of the copolymerization of styrene and p‐methoxystyrene

Key Points

Discussion

Implication

Cite This Study

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