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Kinetics of Polyurethane Formation in Polymerization Reactions Using the Organometallic Diol (η5-C5H4CH2CH2OH)2Mo2(CO)6

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Summary

The kinetics of the dibutyltin diacetate (DBTA) – catalyzed polymerization reactions of (η5-C5H4CH2CH2OH)2Mo2(CO)6 with Hypol 2000 (an isocyanate-terminated polyether prepolymer) and with 1,4-butanediol were studied, as were the kinetics of a copolymerization involving (η5-C5H4CH2CH2OH)2Mo2(CO)6 and PEG-1000 (a poly(ethylene glycol)) with Hypol 2000. The purpose was to determine if (η5-C5H4CH2CH2OH)2Mo2(CO)6 appreciably affected the overall rate of the polymerization reaction and if it changed the mechanism of the reaction. The kinetics were analyzed with a fitting program, which allowed extraction of the rate constants for the individual elementary steps in the mechanism. The results showed that (η5-C5H4CH2CH2OH)2Mo2(CO)6 does not significantly alter the timescale of the reaction and that the same reaction mechanism is likely used as with the 1,4-butanediol and PEG-1000. There are some differences in the rate constants of the elementary steps, but these differences can be attributed to the increased steric crowding caused by the bulkier (η5-C5H4CH2CH2OH)2Mo2(CO)6 diol. The effect of the (η5-C5H4CH2CH2OH)2Mo2(CO)6 on the polymers’ physical properties was also investigated. As is the case with other segmented polyurethanes, the hydrogen bonding index (HBI) and the relative amount of soft segments of the (η5-C5H4CH2CH2OH)2Mo2(CO)6-containing polyurethane correlate in a general way with the physical properties of the polymer.

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Authors and Affiliations

  1. Department of Chemistry, University of Oregon, Eugene, OR, 97403, USA

    Rui Chen, Elizabeth Spence & David R. Tyler

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  1. Rui Chen
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  2. Elizabeth Spence
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  3. David R. Tyler
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Correspondence to David R. Tyler.

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Chen, R., Spence, E. & Tyler, D.R. Kinetics of Polyurethane Formation in Polymerization Reactions Using the Organometallic Diol (η5-C5H4CH2CH2OH)2Mo2(CO)6. J Inorg Organomet Polym 15, 221–230 (2005). https://doi.org/10.1007/s10904-005-5538-0

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  • DOI: https://doi.org/10.1007/s10904-005-5538-0

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