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Non-ideality in vinyl polymerization—IV. Kinetics of polymerization of vinyl acetate in benzene initiated by azo-bis isobutyronitrile (AIBN)

✍ Scribed by Pramil C. Deb; Swati Ray

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
257 KB
Volume
14
Category
Article
ISSN
0014-3057

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✦ Synopsis

Vinyl acetate was polymerized in bulk and in benzene at 50°C using a wide range of concentrations of azobisisobutyronitrile. Values offk (the efficiency of initiator) and kr,,/klk p (the characteristic constant of primary radical termination) were found to be 0.53 and 2.00 x 104 respectively from data for bulk polymerization. In solution polymerization, the initiator exponent is a function of initiator concentration ranging from 0.35 at high concentration to-about 0.65 at low concentration. This result has been explained on the basis of degradative chain transfer to solvent and primary radical termination. The results have been treated according to mathematical formulations already developed; the characteristic constant of degradative chain transfer and the transfer constant of the solvent have been determined. The results have been compared with literature values and discrepancies explained.

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