Copolymerization of styrene and diethyl fumarate with zinc bromide. V. Electroinitiated copolymerization at high current strengths

Autor:	D. Colin Phillips, David H. Davies, J. D. B. Smith
Rok vydání:	1973
Předmět:	chemistry.chemical_classification Solvent chemistry.chemical_compound Monomer chemistry Polymer chemistry Copolymer Acid salt Methanol Carboxylate Zinc bromide Styrene
Zdroj:	Journal of Polymer Science: Polymer Chemistry Edition. 11:1867-1879
ISSN:	1542-9369 0360-6376
DOI:	10.1002/pol.1973.170110809
Popis:	The electroinitiated copolymerization of styrene and diethyl fumarate in methanol solvent with zinc bromide as electrolyte has been investigated at high current strengths (200–500 mA). Unlike the copolymerization behavior observed at lower current strengths (< 200 mA), it is found that the cathodically produced copolymers deviate from a 1:1 composition and show a significant deficiency in styrene. The copolymer products can be separated into two well-defined fractions: a toluene-soluble fraction (normal copolymer) and a toluene-insoluble one (styrene-deficient copolymer). These deviations in copolymer composition from a 1:1 monomer ratio are attributed to the occurrence of cathodically induced electroreductive hydrolysis side reactions with diethyl fumarate leading to the formation of carboxylate or acid salt species. Reaction of these hydrolyzed species with diethyl fumarate results in the formation of fumarate-rich copolymers.
Databáze:	OpenAIRE
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