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    • Keywords


      Catalyst; maghnite-H$^+$; bentonite; decamethylcyclopentasiloxane; ring opening polymerization.

    • Abstract


      In this study, we propose Maghnite-H$^+$, as an ecological, cost-effective and easily renewable catalyst, for the polymerization of decamethylcyclopentasiloxane (D5). The Maghnite is a clay consisting primarily of smectite minerals (montmorillonite group), which can be activated/reactivated through a simple process, by replacing interlayer cations by protons. Linear polymers with higher molecular mass and narrower molecular mass distribution (MMD) can be obtained with less cyclic by-products, using Maghnite-H$^+$. The reaction was investigated in bulk, taking into account the effect oftime, temperature and amount of catalyst on the monomer conversion and MMD.When the yield rises to 96%, the MMD is broadened, suggesting the formation of cyclic oligomers and/or crosslinking bonds, this was confirmed experimentally by infra-red spectroscopy, proton nuclear magnetic resonance (${}^1$H NMR) and ${}^{13}$C NMR analyses. The kinetics have been also studied; the reaction is first order in the monomer. The proposed reaction mechanism shows clearly the role of Maghnite-H$^+$ for D5 polymerization.

    • Author Affiliations



      1. Laboratory of Polymer Chemistry, Department of Chemistry, Faculty of Exact and Applied Sciences, University of Oran, 1 Ahmed Ben Bella, BP 1524, 31000 El’Menouer Oran, Algeria
      2. Institute of Sciences and Technology, University Centre of Relizane Ahmed Zabana, BP 48000, Relizane, Algeria
      3. Laboratory of Macromolecular Chemistry, Polytechnic Military School (EMP), 16111 Bordj El Bahri, Algiers, Algeria
    • Dates

  • Bulletin of Materials Science | News

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