Influence of the nature of the peroxide compound on the process of formation of block copolymers in the polystyryl aluminium-peroxide-methylmethacrylate system

Autor:	G.P. Mart'yanova, L.V. Zamoiskaya
Rok vydání:	1987
Předmět:	Reaction rate chemistry.chemical_compound Polymerization chemistry Peroxydicarbonate Polymer chemistry General Engineering Living polymerization Chain transfer Disproportionation Photochemistry Chain termination Peroxide
Zdroj:	Polymer Science U.S.S.R.. 29:490-496
ISSN:	0032-3950
DOI:	10.1016/0032-3950(87)90252-8
Popis:	Initiation systems of the type polystyryl aluminium-dicyclohexyl peroxydicarbonate or di-tert-butylperoxide help in the synthesis of the PS-PMMA block copolymers by the radical mechanism of polymerization at temperatures below thermal breakdown of the peroxide (253–313 K). It is shown that the necessary condition for the effective development of the process is the presence of an electron donor compound, in particular, pyridine. The function of the latter consists in the regulation of the reaction rate between the components of the initiating system and also in the suppression of the chain transfer reaction. The conditions are formulated allowing one to influence in a directed way the M and strucutre of block copolymers of two-block structure formed in the system as a result of dominating chain termination by way of disproportionation and the chain transfer reaction or the three-block PS-PMMA-PS structure formed as a result of the recombination mechanism of chain termination.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::57fac5f4e39b7903fbf1b9ce612fe595 https://doi.org/10.1016/0032-3950(87)90252-8 Zobrazit plný text záznamu