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Cationic polymerization of poly(α-methylstyrene-block-isobutyl vinyl ether) using Maghnite-H+ clay (Algerian MMT) as catalyst

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Abstract

The synthesis of a new copolymer poly(α-methylstyrene-block-isobutyl vinyl ether) by cationic polymerization is reported. The polymerization was performed in bulk under suitable condition at temperature 0 °C. The copolymer was prepared by the reaction of alpha-methylstyrene (α-MS) with isobutyl vinyl ether (IBVE), in the presence of a natural Algerian montmorillonite clay modified by 0.05–1 M H2SO4, known as Maghnite-H+, as proton source, a non-toxic and an efficient catalyst for cationic polymerization of many vinylic and hetero-cyclic monomers. It was found that H2SO4 concentration allows controlling the chemical composition, the porous structure of the acid-activated clays, and their catalytic performance. The maximal yield of polymer is observed in the presence of Algerian MMT modified by 0.25 M H2SO4. Effects of α-MS/IBVE molar ratio, catalyst concentration, on yield and molecular weight of polymer were revealed in the presence of the most active sample. The structure of the products obtained is confirmed by 1H-NMR, 13C-NMR (nuclear magnetic resonance), Fourier transform infrared spectroscopy, differential scanning calorimetry, and gel-permeation chromatography, finally, a mechanism for the reaction was proposed.

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Acknowledgements

All our gratitude to the anonymous referees for their careful reading of the manuscript and valuable comments helped in shaping this paper to the present form. We thank all laboratory staffs of polymer chemistry from the University of Oran 1 Ahmed Benbella (Algeria) for their kind cooperation.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Sciences, Dr Moulay Taher University, BP 138 City, 20000, Nasr Saida, Algeria

    Moulkheir Ayat

  2. Laboratory of Polymer Chemistry, Department of Chemistry, Faculty of Science, University of Oran 1 Ahmed Benbella, BP No 1524, El M’Naouar, 31000, Oran, Algeria

    Moulkheir Ayat, Mohammed Belbachir & Abdelkader Rahmouni

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  1. Moulkheir Ayat
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Correspondence to Abdelkader Rahmouni.

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Ayat, M., Belbachir, M. & Rahmouni, A. Cationic polymerization of poly(α-methylstyrene-block-isobutyl vinyl ether) using Maghnite-H+ clay (Algerian MMT) as catalyst. Polym. Bull. 75, 5355–5371 (2018). https://doi.org/10.1007/s00289-018-2328-8

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