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Initiation of polymerization with substituted ethanes—12. Free radical polymerization of methyl methacrylate and styrene initiated with 3-methoxycarbonyl-3-methyl-2,2,5,5-tetraphenylhexanedinitrile

✍ Scribed by Dietrich Braun; Hans Jörg Lindner; Hartmut Tretner

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
353 KB
Volume
25
Category
Article
ISSN
0014-3057

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✦ Synopsis

The title compound, the first member of a homologous series of oligomers formed by free radical polymerization of methyl methacrylate initiated by tetraphenylbutanedinitrile, was synthesized and its structure was determined by X-ray diffraction. The longest C--C bond of this molecule measures 1.628 A and can be thermally split to give radicals. The activation energy of this dissociation was found to be 150 kJ/mol. The kinetics of the free radical polymerization of methyl methacrylate and styrene initiated with the title compound shows remarkable deviations from the ideal polymerization kinetics, indicating that primary radical termination might be the main chain termination reaction.

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