New approach for synthesis of poly(ethylglyoxylate) using Maghnite-H + , an Algerian proton exchanged montmorillonite clay, as an eco-catalyst

Souad Bennabi 1, * Nabahat Sahli 1 Mohammed Belbachir 1 Claire-Hélène Brachais 2 Gilles Boni 2 Jean-Pierre Couvercelle 2
* Auteur correspondant
1 Département de Chimie [Université d'Oran]
Université d'Oran 1 Ahmed Ben Bella [Oran]
2 ICMUB - Institut de Chimie Moléculaire de l'Université de Bourgogne [Dijon]
Abstract : In this works, we have explored a new method for a green synthesis of poly(ethylglyoxylate) (PEtG). This method consists on using a montmorillonite clay called Maghnite-H+ as an eco-catalyst to replace triethylamine which is toxic. Cationic polymerization experiments are performed in bulk conditions at three temperatures (-40 degrees C, 25 degrees C, 80 degrees C) and in THF solutions at room temperature (25 degrees C). At 25 degrees C, an optimum ratio of 5 wt% of catalyst leads to molar masses up to 22000 g/mol in THF solutions. Polymerizations in bulk conditions lead to slightly lower masses than experiments conducted in THF solutions. However, bulk polymerization of ethyleglyoxylate remains a preferable method in order to avoid the use of a solvent and therefore to stay in the context of green chemistry. The structure of obtained polymers are characterized and confirmed by H-1 and C-13 NMR. Thermogravimetric Analysis (TGA) shows an enhanced thermal stability for end-capped PEtG compared to non-terminated PEtG. The best conversion rate (92%) is observed in bulk conditions at 25 degrees C for a reaction time of 48h. An activation energy could be calculated from bulk experiments (Ea = 6.9kJ/mol). An interesting advantage of Maghnite-H+ is an easy recoverage by a simple filtration from the polymer solution.
Keywords : Ethylglyoxylate Maghnite-H+ eco-catalyst green chemistry cationic polymerization biodegradable polymer ring-opening polymerization sheet silicates poly(methyl glyoxylate) biodegradable plastics ionic polymerizations epsilon-caprolactone bis-macromonomers alcohols degradation copolymer
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https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01672008
Contributeur : Icmub - Université de Bourgogne <>
Soumis le : vendredi 22 décembre 2017 - 19:26:58
Dernière modification le : vendredi 8 juin 2018 - 14:50:12

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Souad Bennabi, Nabahat Sahli, Mohammed Belbachir, Claire-Hélène Brachais, Gilles Boni, et al.. New approach for synthesis of poly(ethylglyoxylate) using Maghnite-H + , an Algerian proton exchanged montmorillonite clay, as an eco-catalyst. Journal of Macromolecular Science Part A Pure and Applied Chemistry, Taylor & Francis: STM, Behavioural Science and Public Health Titles, 2017, 54 (11), pp.843 - 852. ⟨10.1080/10601325.2017.1339558⟩. ⟨hal-01672008⟩

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