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Organic reactions under high pressure. IX. The effect of pressure on the stereochemistry of methyl methacrylate polymerization

✍ Scribed by Walling, Cheves ;Tanner, Dennis D.

Publisher
Wiley (John Wiley & Sons)
Year
1963
Tongue
English
Weight
304 KB
Volume
1
Category
Article
ISSN
0449-2951

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✦ Synopsis

Abstract

The radical polymerization of methyl methacrylate has been carried out at 51Β°C. over a pressure range of 1–8000 kg./cm.^2^, and the stereochemistry of the polymer analyzed by NMR spectroscopy. Over the entire pressure range, the stereochemistry of addition is independent of the stereochemistry of the growing polymer chain. The percentage of syndiotactic linkages decreases from about 75% to 62%, and the change in the resulting distribution of stereosequences is calculated. It is concluded that the transition state for syndiotactic addition is slightly larger than that for isotactic addition to the growing chain.

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