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Solvent Effects on Stereoregularity of Poly(vinyl Trifluoroacetate) Obtained by Radical Polymerization by Matsuzawa, Shuji ;Yamaura, Kazuo ;Noguchi, Hiroji ;Hayashi, Hiromichi is a Chemistry article available to read on EtoBox.

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## Abstract Vinyl trifluoroacetate was polymerized by free radicals in various kinds of solvents at temperatures between +60 and ‐40°C. The __syndiotactic__ and __isotactic__ diad contents of the polymer were determined __via__ the triad content, which was obtained by their NMR‐spectra. The differences of the activation enthalpies and those of the activation entropies between __isotactic__ and __syndiotactic__ arrangements were calculated from the temperature dependence of the ratio of __isotactic__ to __syndiotactic__ diads formed in the different solvents. A compensation effect exists between the two differences. The syndiotacticities of the polymers synthesized in alkanes in which the polymers were insoluble were higher than those in esters and ketones in which the polymers were soluble. The syndiotactic diad contents of the polymer synthesized in alkanes and ketones at −40°C amount to 60∼63% and 52∼56% respectively.

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Author

Matsuzawa, Shuji ;Yamaura, Kazuo ;Noguchi, Hiroji ;Hayashi, Hiromichi

Publisher

Wiley (John Wiley & Sons); Wiley (ISSN 0025-116X)

Published

1973

Language

EN

Field

Chemistry (Physical Sciences)