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Radiation induced polymerization of isoprene: A spectroscopic study

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Abstract

Isoprene polymerizes under the action of γ-radiation from a 60Co source yielding a low molecular weight polyisoprene which remains soluble in the unreacted monomer. The electronic absorption spectrum of polyisoprene oligomer in isoprene monomer has been explained using squalene, a polyisoprene hexamer, as model compound. The radiation chemical yield for polyisoprene formation has been estimated from both gravimetric and spectrophotometric data pertaining the amount of polymer formed. An average G value of 35 molecules/100 eV has been determined suggesting that the polymerization mechanism involves free radicals. The chemical structure of the resulting polyisoprene radio-oligomer has been determined by FT-IR spectroscopy and found identical to that of a reference polyisoprene sample prepared by a chemically-initiated free radical polymerization process. The structure determination by FT-IR spectroscopy has been reported in detail.

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Authors and Affiliations

  1. Lupi Chemical Research, Via Casilina 1626/A, 00133, Rome, Italy

    F. Cataldo

  2. Institute of Chemical Methodologies CNR, Via Salaria Km. 29,300, 00016, Monterotondo Stazione (Rome), Italy

    O. Ursini & E. Lilla

Authors
  1. F. Cataldo
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  2. O. Ursini
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  3. E. Lilla
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Correspondence to F. Cataldo.

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Cataldo, F., Ursini, O. & Lilla, E. Radiation induced polymerization of isoprene: A spectroscopic study. J Radioanal Nucl Chem 275, 9–16 (2008). https://doi.org/10.1007/s10967-006-6981-2

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  • DOI: https://doi.org/10.1007/s10967-006-6981-2

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