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Cationic Polymerization of Epoxides using Novel Xanthenyl Phosphonium Salts as Thermo-latent Initiator

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Abstract

The present article describes the effect of steric and electronic factors on the efficiency of initiators based on novel xanthenyl phosphonium salts for cationic polymerization of epoxide monomers. 2-substituted (IH, ICl, IMe, and IOMe) xanthenyl phosphonium hexafluoroantimonate were synthesized and characterized by NMR (1H, 13C and 31P) and IR spectroscopy. The order of initiator activity in polymerization of glycidyl phenyl ether (GPE), was found as IH> ICl>IMe>IOMe. To understand the effect of steric factor, the polymerization of cyclohexene oxide (CHO) was performed and the order of activity was found as ICl>IH>IMe >IOMe. All the initiators were found to be latent at ambient temperature and initiates polymerization on thermal initiation. The order of initiator activity was influenced by electronic and steric factors in the system. The thermal stability of these salts was measured by Thermo gravimetric analysis (TGA). The solubility of the initiators in various organic solvents and epoxy monomers is also discussed.

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Authors and Affiliations

  1. Polymer Science and Engineering Division, National Chemical Laboratory, 411 008, Pune, India

    Mukesh Kumar Gupta & Raj Pal Singh

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  1. Mukesh Kumar Gupta
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  2. Raj Pal Singh
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Correspondence to Raj Pal Singh.

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Gupta, M.K., Singh, R.P. Cationic Polymerization of Epoxides using Novel Xanthenyl Phosphonium Salts as Thermo-latent Initiator . Polym. Bull. 60, 755–763 (2008). https://doi.org/10.1007/s00289-008-0910-1

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  • DOI: https://doi.org/10.1007/s00289-008-0910-1

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