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Synthesis of the acetylacetone telechelate of polydimethylsiloxane and its gelation with Cr(III) and Fe(III)

✍ Scribed by I-Wei Liao; B. E. Eichinger

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
809 KB
Volume
28
Category
Article
ISSN
0887-624X

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✦ Synopsis

Abstract

The batch synthesis of acetylacetone end‐capped polydimethylsiloxane is described. Efforts to end‐link the telechelic polymer with several simple metal salts yielded poorly gelled systems, except for the cases where FeCl~3~ and CrCl~3~ Β· 3THF were used. With these salts, low but nonetheless appreciable, gel fractions of 45 and 40%, respectively, were obtained. The difficulty experienced in obtaining high gel fractions is traced to incomplete ligand exchange reactions in low polarity media.

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The reaction rates of Cr(III) oligomers with partially hydrolyzed (PAAm) polyacrylamide were measured. The oligomers were prepared in relatively pure form using liquid chromatography, allowed to react with polymer, quenched, and then separated using equilibrium dialysis. In the pH range of 4-5, Cr(I