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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >New approach for synthesis of poly(ethylglyoxylate) using Maghnite-H+, an Algerian proton exchanged montmorillonite clay, as an eco-catalyst
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New approach for synthesis of poly(ethylglyoxylate) using Maghnite-H+, an Algerian proton exchanged montmorillonite clay, as an eco-catalyst

机译：使用Maghnite-H +合成聚（乙基乙醇氧基化物）的新方法，Algerian质子交换Montmorillonite粘土，作为生态催化剂

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摘要

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.
机译：在这作用中，我们探索了一种新的聚（乙基氧化乙酸酯）（PETG）的绿色合成方法。该方法包括使用称为Maghnite-H +的Montmorillonite粘土作为生态催化剂，以替代毒性的三乙胺。阳离子聚合实验在室温（25摄氏度）的三个温度（-40℃，25℃，80℃）和THF溶液中进行散装条件。在25摄氏度下，5wt％的催化剂的最佳比率导致THF溶液中高达22000g / mol的摩尔质量。散装条件中的聚合导致略低于THF溶液中进行的实验。然而，用于避免使用溶剂并因此保持在绿色化学的背景下，甲炔氧基化物的本体聚合仍然是优选的方法。所得聚合物的结构特征和通过H-1和C-13 NMR证实。与非终止PETG相比，热重分析（TGA）显示了最终封端PETG的热稳定性。在25℃下在散装条件下观察到最佳转化率（92％），以48小时的反应时间。可以从批量实验（EA = 6.9KJ / mol）计算激活能量。 Maghnite-H +的有趣优势是通过来自聚合物溶液的简单过滤来易于回收。

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