An Acid Exchanged Montmorillonite Clay-Catalyzed Synthesis of Polyepichlorhydrin

Abstract

"Maghnite", a montmorillonite sheet silicate clay, exchanged with protons to produce "H-Maghnite" is an efficient catalyst for cationic polymerisation of many

Polycondensation of pyrrole and benzaldehyde catalyzed by Maghnite–H+

“…As shown in Figure 8, a yield of 66 wt % was reached for 5 wt% of Mag-H + , and the use of a lower or higher amount of clay caused a decrease of the yield of the reaction. Similar results are obtained by Yahiaoui et al [32][33][34][35] in the polymerization of epichlorhydrin, propylene oxide and cyclohexene oxide by Mag-H + and the polymerization of styrene by montmorillonite, respectively. This phenomenon is probably the result of the number of 'initiating active sites' responsible of inducing polymerization, this number is prorating to the catalyst amount used in reaction.…”

A Novel Poly{(2,5-diyl furan) (benzylidene)}: A New Synthetic Approach and Electronic Properties

“…The yield of PFB increased with the amount of Mag-H + , in which the effect of Mag-H + as a cationic catalyst for furan and benzaldehyde copolymerization is clearly shown. Similar results are obtained by Yahiaoui et al [20][21][22] in the polymerization of epichlorhydrin, propylene oxide and cyclohexene oxide by Mag-H + and the polymerization of styrene by montmorillonite, respectively. This phenomenon is probably the result of the number of "initiating active sites" responsible of inducing polymerization, this number is prorating to the catalyst amount used in reaction.…”

Synthesis and Characterization of a new hybrid material (MOF-5/Mag-H+ ) based on a Metal-Organic Framework and a Proton Exchanged Montmorillonite Clay (Maghnite-H+) as catalytic support

“…On all the spectra, two small bands can be distinguished at apparent chemical shifts of 58-60 ppm and 68-71 ppm and which are assigned to AlO 4 octaedric sites in the Maghnite structure as a consequence of isomorphic ions substitution within the silicate layers. Another dominant asymmetric line at apparent chemical shifts of 3-4 ppm is assigned to AlO 6 sites within the octahedral sheets of the clay [19][20][21][22]. All spectra are similar, indicating that the aluminosilicate layers of the clay are not chemically modified by their incorporation in MOF-5 during the polymerization process.…”