Summary
The kinetics of substitution reaction on PVC with sodium benzenethiolate at temperatures from-30°C to 5°C is studied and compared to that of earlier work at temperatures from 5°C to 70°C. The kinetic parameters indicate the occurrence of two overlapping processes having activation energy of 10 and 17 Kcal/mol. Their attribution to the isotactic GTTG− and the heterotactic GTTT triad conformations respectively, is argued on the basis of recent results. A few of substitution experiments were repeated in the presence of diglyme or crown ether. They clearly demonstrate that kinetic features are only dependant on the microstructure of the polymer.
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References
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Martínez, G., Mijangos, C. & Millán, J. Stereospecificity of substitution on PVC. Polymer Bulletin 23, 233–238 (1990). https://doi.org/10.1007/BF00338506
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DOI: https://doi.org/10.1007/BF00338506