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

  • Djamal Eddine KherroubEmail author
  • Mohammed Belbachir
  • Saad Lamouri
  • Karim Chikh
Research Paper


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.


Maghnite-H+ Catalyst Montmorillonite Octamethylcyclotetrasiloxane Ring opening polymerization 


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Copyright information

© Shiraz University 2017

Authors and Affiliations

  • Djamal Eddine Kherroub
    • 1
    • 2
    Email author
  • Mohammed Belbachir
    • 1
  • Saad Lamouri
    • 3
  • Karim Chikh
    • 1
  1. 1.Laboratory of Polymer Chemistry, Department of Chemistry, Faculty of Exact and Applied SciencesUniversity of Oran 1 Ahmed Ben BellaEl’Menouer OranAlgeria
  2. 2.Institute of Sciences and TechnologyUniversity Centre of Relizane Ahmed ZabanaRelizaneAlgeria
  3. 3.Laboratory of Macromolecular ChemistryPolytechnic Military School (EMP)AlgiersAlgeria

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