Anionic copolymerization of methacrylates

Autor:	P. Vlček, Jiří Trekoval, D. Doskočilová
Rok vydání:	2007
Předmět:	chemistry.chemical_compound Monomer chemistry Tacticity Polymer chemistry General Engineering Copolymer chemistry.chemical_element Reactivity (chemistry) Lithium Methyl methacrylate Methacrylate Benzene
Zdroj:	Journal of Polymer Science: Polymer Symposia. 42:231-238
ISSN:	1936-0959 0360-8905
DOI:	10.1002/polc.5070420125
Popis:	An investigation was carried out of the anionic copolymerization of methyl methacrylate (M1), 2-methoxyethyl methacrylate (M2), and 2-(N, N-dimethylamino) ethyl methacrylate (M3) in benzene solution at 20°C initiated with lithium tert-butoxide. The monomer reactivity ratios (M1–M2) r1 = 1.51 ± 0.05, r2 = 2.10 ± 0.10, (M1–M3) r1 = 1.20 ± 0.10, r3 = 0.40 ± 0.05, (M2–M3) r2 = 1.40 ± 0.15, r3 = 0.60 ± 0.15 show that the reactivities of the individual monomers M1, M2, and M3 do not differ too much from each other. A study of the microstructure of copolymers M1–M2 by the NMR method revealed that at low conversions the tacticity of the copolymers depends on the concentration of 2-methoxyethyl methacrylate in the starting monomer mixture; in the initial stage of copolymerization it is strongly dependent on conversion. Already a low content of M2 in the starting monomer mixture (below 1%) strongly affects the tacticity of the forming copolymer by depressing the content of the isotactic component.
Databáze:	OpenAIRE
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