Selective Synthesis, Characterization and Kinetics Studies of poly(α-Methyl styrene) induced by Maghnite-Na+ Clay (Algerian MMT)

Abstract

A new and efficient catalyst of Na-Montmorillonite (Na + -MMT) was employed in this paper for α-methylstyrene (AMS) cationic polymerization. Maghnite clay, obtained from Tlemcen Algeria, was investigated to remove heavy metal ion from wastewater. "Maghnite-Na" is a Montmorillonite sheet silicate clay, exchanged with sodium as an efficient catalyst for cationic polymerization of many vinylic and heterocyclic monomers. The various techniques, including 1 H-NMR, 13 C-NMR, IR, DSC and Ubbelohde viscometer, were used to elucidate structural characteristics and thermal properties of the resulting polymers. The structure compositions of "MMT", "H + -MMT" and "Na + -MMT" have been developed. It was found that the cationic polymerization of AMS is initiated by Na + -MMT at 0 °C in bulk and in solution. The influences of reaction temperature, solvent, weight ratio of initiator/monomer and reaction time on the yield of monomer and the molecular weight are investigated. The kinetics indicated that the polymerization rate is first order with respect to the monomer concentration. A possible mechanism of this cationic polymerization is discussed based on the results of the 1 H-NMR Spectroscopic analysis of these model reactions. A cationic mechanism for the reaction was proposed. From the mechanism studies, it was showed that monomer was inserted into the growing chains.

Polymerization of Ethylene Glycol Dimethacrylate (EGDM), Using An Algerian Clay as Eco-catalyst (Maghnite-H+ and Maghnite-Na+)

“…The novelty of this work is to study the synthesis of ethylene glycol dimethacrylate using a green and recyclable catalyst (Maghnite-H + ), and to study its polymerization initiated directly by Algerian montmorillonite clay (Maghnite-Na + ). This new eco-catalyst has been used successfully to prepare and study several kinds of polymers [35][36][37]. First, we have synthesized the monomer ethylene glycol dimethacrylate (EGDM) by the condensation of ethylene glycol with methacrylic anhydride in bulk; and subsequently the polymerization of the obtained monomer was carried out under suitable and mild conditions.…”

Molecular structure of PANI and its homologue PANI–PEO2000 catalyzed by Maghnite-H+ (Algerian MMT): synthesis, characterization and physical and chemical properties

“…4). According to the work published by Yahiaoui et al [38], 1 H NMR spectroscopy at 300 MHz (Solvent CDCl 3 ) ( Fig. 4) showed different peaks: (a) the methylene groups (CH 2 -) at 2.6 ppm and (b) the methylene (CH 2 O-) at 3.7 ppm.…”

Green anionic polymerization of vinyl acetate using Maghnite-Na+ (Algerian MMT): synthesis characterization and reactional mechanism

“…The advantage of this new method of polymerization is also the use of a catalyst that promotes the synthesis reaction called Maghnite-Na + [19,20]. It is easily available, green, non-toxic, inflammable and inexpensive because it can be separated from the system by simple filtration and reused in other reactions [21,22]. Unlike natural clay minerals Maghnite-Na + has high crystallinity, controllable composition and fewer impurities [23].…”