Homogeneous Polymerization of Butadiene Catalyzed by Rhodium Salts

Autor:	A. M. North, D. G. T. Cooper, C. E. H. Bawn
Rok vydání:	1967
Předmět:	chemistry.chemical_classification Aqueous solution Polymers and Plastics Hydride Chemistry Iodide chemistry.chemical_element Solution polymerization Photochemistry Catalysis Rhodium chemistry.chemical_compound Polymerization Bromide Polymer chemistry Materials Chemistry
Zdroj:	Rubber Chemistry and Technology. 40:602-613
ISSN:	1943-4804 0035-9475
DOI:	10.5254/1.3539074
Popis:	A study has been made of the solution polymerization of butadiene, to predominantly trans 1, 4 polymer, catalysed by rhodium salts. The reaction is accelerated by protonic acids (including water) and by those reducing agents which in aqueous systems would be capable of reducing RhIII to RhI. Ligands such as organic amines, and also bromide and iodide anions, tend to retard or even inhibit the reaction. The overall process appears to be a chain reaction, but is not free radical in character. The mechanism which best fits all the observations is one in which the active species is a π-allylic rhodium hydride, initiation occurring by hydride shift and propagation occurring by a ligand displacement process.
Databáze:	OpenAIRE
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