Abstract
A new procedure for synthesizing a dimethyl siloxane polymer is addressed in the present work, which is based on the use of Maghnite-H+ as a green and environmentally friendly catalyst in the polymerization of dodecamethylcyclohexasiloxane (D6). The Maghnite-H+ is natural smectite clay, activated by a strong acid, sulfuric acid is generally the most used. The impact of acid activation appears in increasing the basal spacing of the Maghnite, it is confirmed by XRD analysis. The solvent-free polymerization of D6 by cationic route using the Maghnite-H+ has been made, the product obtained was characterized by different methods of analysis as IR, 1H NMR, 13C NMR and GPC. Temperature, time and mass content of catalyst were optimized so to obtain a yield and an average molecular mass large enough and without cyclic structures. Also, the thermal behavior of the polymer was investigated by DSC. At the end, a reaction mechanism was proposed which describes in detail the role played by the Maghnite-H+ during the various stages of the reaction.
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