CROSS-LINKING OF COPOLYMERS FROM METHYL VINYL KETONE AND n-BUTYL ACRYLATE

Autor:	W. Cooper, E. Catterall
Rok vydání:	1956
Předmět:	chemistry.chemical_classification Acrylate Organic Chemistry chemistry.chemical_element General Chemistry Zinc Polymer Sulfur Catalysis chemistry.chemical_compound chemistry Methyl vinyl ketone Polymer chemistry Copolymer Organic chemistry N-butyl acrylate
Zdroj:	Canadian Journal of Chemistry. 34:387-405
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v56-057
Popis:	Copolymers of n-butyl acrylate and methyl vinyl ketone can be cross-linked by a combination of sulphur and zinc oxide; the reaction is associated with the methyl vinyl ketone units in the polymer chain. From studies on the copolymers and model compounds, it is suggested that adjacent pairs or groups of methyl vinyl ketone units in the polymer cyclize to give αβ unsaturated ketone groups. These contain reactive hydrogen which is attacked by sulphur; disulphide or zinc mercaptide cross-links are then formed. Water is produced in the cyclization reaction and hydrolyzes some of the ester groups; additional cross-links are thus formed by reaction of the acid groups with zinc oxide. The ease of cyclization and, therefore, the extent of cross-linking is dependent on the method of preparing the copolymers, emulsion copolymers being much more reactive than those prepared in solution. A comparison has been made between the sulphur + zinc oxide system and other cross-linking agents which may be used for polyacrylates.
Databáze:	OpenAIRE
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