Synthesis and characterization of amino‐terminated telechelic polybutadiene

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Abstract
Butadiene was polymerized with water‐soluble 4,4′‐azobis(amidinopropane)dihydrochloride initiator in an ethanol‐water medium at 60°C. Important variables, such as the initiator concentration, monomer concentration, solvency, and polymerization time and temperature were studied. 13C‐NMR studies showed that no observable chain transfer to ethanol occurred during the polymerization. The conversion of monomer to polymer was significantly increased while maintaining a relatively narrow molecular weight distribution by intermittent feed of the initiator. The amidino end‐groups of the polymer were transformed into amino groups by reduction using lithium aluminum hydride in THF, so that amine‐terminated polybutadiene was obtained. The amino functionality of the polybutadiene was determined by titration to be 2.0. © 1995 John Wiley & Sons, Inc.

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