Synthèses de polytétrahydrofurane catalysées par le kaolin de Tamazert

Abstract

Le kaolin de Tamazert (Mila), Algérie, a été purifié et acidifié (HCl 0,1 M). Après caractérisation par fluorescence X, MAS RMN, FTIR et DRX, son utilisation comme catalyseur dans les réactions de polymérisation cationique par ouverture de cycle en masse du tétrahydrofurane (THF) à température ambiante a été étudiée. La polymérisation du THF n'est possible qu'en présence de l'anhydride acétique (AA), avec des taux de conversion élevés, mais la présence du kaolin améliore nettement ces derniers.

Synthesis of Polytetrahydrofuran Using Protonated Kaolin as A Solid Acid Catalyst

“…The vibrations at 995, 563, and 745 cm -1 were attributed to the crystalline structure of poly(THF) [30]. The results deduced from the 1 H-NMR spectrum (Figure 2) confirm the structure of the poly(THF) resulting from the polymerization and they adapted the results described by Ouis et al [22].…”

“…For this purpose, the use of nontoxic heterogeneous catalysts instead the mentioned homogenous catalysts can be an efficient solution method [10]. Regarding the application of heterogeneous catalysis for the polymerization process, over the last few decades, several research groups have valorized and applied some natural materials based on clays that have been already used as solid catalysts for the polymerization of vinyl, heterocyclic and ester monomers [11][12][13][14][15][16][17][18][19][20][21][22][23]. Among these clay materials, the kaolin, a class of inexpensive and a new non-toxic cationic catalyst, exhibited much higher catalytic reactivities in different organic synthesis processes [10,[24][25].…”

“…Among these clay materials, the kaolin, a class of inexpensive and a new non-toxic cationic catalyst, exhibited much higher catalytic reactivities in different organic synthesis processes [10,[24][25]. Many works have been devoted to the polymerization of heterocyclic monomers, such as: THF using clays as catalysts [22,26]. Recently, Ouis et al [22] have studied the polymerization of THF using the kaolin of Tamazert (Mila, Algeria).…”

“…Many works have been devoted to the polymerization of heterocyclic monomers, such as: THF using clays as catalysts [22,26]. Recently, Ouis et al [22] have studied the polymerization of THF using the kaolin of Tamazert (Mila, Algeria). The results of their research confirmed the high efficiency of kaolin for the THF polymerization where the conversion rate was 56% by the use of 15% of kaolin.…”

Maghnite, a Green Catalyst for Cationic Polymerization of Vinylic and Cyclic Monomers

“…[15] Polymerization of 1,3-DXL The ring-opening polymerizations of heterocyclic monomers such as 1,3-DXL are initiated by Lewis acids, protic acid, and so forth. Recently, Ferrahi and Belbachir [16] and Ouis et al [21] polymerized tetrahydrofuran, and Yahiaoui et al [18] and Harrane [22] polymerized propylene oxide and caprolactone, respectively, with Mag-H as an initiator. Indeed, the first part of this work concerns the synthesis of PDXL with Mag-H.…”