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Anionic polymerization of methacrylonitrile—I. Polymerization with n-butyllithium as initiator

✍ Scribed by H. Vankerckhoven; M. Van Beylen

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
802 KB
Volume
14
Category
Article
ISSN
0014-3057

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✦ Synopsis

The anionic polymerization of methacrylonitrile has been studied at -75 in toluene and with n-butyllithium as initiator. The kinetics of the polymerization were investigated considering the consumption of both monomer and initiator. BuLi disappears relatively slowly and about 50-60'!,, remains unreacted. A simple kinetic scheme cannot therefore be put forward. All possible side reactions have also been examined. The molecular weight study establishes the living character of this system and gives an initiator efficiency of about 0.2. The contribution of low molecular weight products, typical of the polymerization of polar monomers, is also taken into account. In order to obtain a better understanding of the mechanism of this polymerization, in which unreacted initiator is probably engaged in very stable and inactive mixed associated particles, small amounts of THF (known frequently to break down such aggregates) were added to the system. A rather unexpected slow but complete disappearance of the initiator occurs; the conversion at which the rate of monomer consumption levels off depends on the THF concentration.

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