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Cationic Ring Opening Polymerization of Octamethylcyclotetrasiloxane Using a Cost-Effective Solid Acid Catalyst (Maghnite-H+)

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Abstract

The polymerization of octamethylcyclotetrasiloxane (D4) catalyzed by Maghnite-H+, a nontoxic and green solid catalyst, is studied. The Maghnite-H+ is a montmorillonite type 2:1 dioctahedral phyllosilicates whose interlayer ions are exchanged by hydronium ions after activation with sulfuric acid which gives it its catalytic appearance. D4 was polymerized cationically by ring opening at 60 °C without solvent using Maghnite-H+ contents less than 5% by weight. The molecular structure of the polymer obtained was identified by IR, 1H NMR and 13C NMR. The DSC was used to study the thermal properties. The operating conditions were optimized so that we can achieve best performance for obtaining a linear polymer with high average molecular mass. The variation of the molecular mass distribution was verified by GPC. Finally, a reaction mechanism was proposed to show the role of the Maghnite-H+ during the different steps of the reaction.

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Authors and 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

    Djamal Eddine Kherroub, Mohammed Belbachir & Karim Chikh

  2. Institute of Sciences and Technology, University Centre of Relizane Ahmed Zabana, 48000, Relizane, Algeria

    Djamal Eddine Kherroub

  3. Laboratory of Macromolecular Chemistry, Polytechnic Military School (EMP), Bordj El Bahri, 16111, Algiers, Algeria

    Saad Lamouri

Authors
  1. Djamal Eddine Kherroub
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  2. Mohammed Belbachir
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  3. Saad Lamouri
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  4. Karim Chikh
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Correspondence to Djamal Eddine Kherroub.

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Kherroub, D.E., Belbachir, M., Lamouri, S. et al. Cationic Ring Opening Polymerization of Octamethylcyclotetrasiloxane Using a Cost-Effective Solid Acid Catalyst (Maghnite-H+). Iran J Sci Technol Trans Sci 43, 75–83 (2019). https://doi.org/10.1007/s40995-017-0269-y

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  • DOI: https://doi.org/10.1007/s40995-017-0269-y

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