Nitroxide‐mediated polymerization of 1,3‐butadiene in the presence of diphenylamine with hydrogen peroxide as initiator |
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Authors: | Hassan Rezaei Haghighat Mehdi Barikani Jalil Morshedian |
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Institution: | 1. Engineering Research Institute, Department of Chemistry, P.O. Box: 13445‐754, Tehran, Iran;2. Iran Polymer and Petrochemical Institute, Faculty of Science, Department of Polyurethane, P.O. Box: 14965/115, Tehran, Iran |
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Abstract: | Living behavior of a nitroxide‐mediated polymerization of 1,3‐butadiene in the presence of diphenyl nitroxide (DPN) as counter radical and hydrogen peroxide (H2O2) as initiator has been studied to elucidate the bimodal molar mass distribution of the product by four approaches such as hydrolyzation of the oligomeric product, peak separation technique, which defines the oligobutadiene molar mass dependency in relation to α as a ratio of nitroxide] to H2O2], variation of hydroxyl value with respect to α, and para‐substituted DPN. It is demonstrated that the synthesized DPN shows efficient control of the polymerization of 1,3‐butadiene, but because of the formation of difunctional nitroxide during the oxidation process of aromatic diphenylamine, a bimodal distribution in the final product is observed. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 |
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Keywords: | diphenyl nitroxide gel permeation chromatography hydrogen peroxide living polymerization nitroxide‐mediated polymerization polybutadiene radical polymerization |
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