Maghnite‐H⁺ as a cationic catalyst in the synthesis of poly(1,3‐dioxolane) and α,ω‐methacryloyloxy‐poly(1,3‐dioxolane)

Abstract

ABSTRACT:The polymerization of 1,3-dioxolane catalyzed by Maghnite-H ϩ; (Mag-H ϩ ), a montmorillonite sheet silicate clay exchanged with protons, was investigated. The cationic ring-opening polymerization of 1,3-dioxolane was initiated by Mag-H ϩ at different temperatures (20, 30, 50, and 70°C) in bulk and in a solvent (dichloromethane). The effects of the amount of Mag-H ϩ and the temperature were studied. The polymerization rate and the average molecular weights increased with an increase in the temperature and the proportion of the catalyst. These results indicated the cationic nature of the polymerization and suggested that the polymerization was initiated by proton addition to the monomer from Mag-H ϩ . Moreover, we used a simple method, in one step in bulk and in solution at room temperature (20°C), to prepare a telechelic bismacromonomer: ␣,-bisunsaturated poly(1,3-dioxolane).

A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst

“…The mechanism proposed for the reaction of limonene polymerization by Maghnite-H + is based on the cationic aspect of the catalyst. The reaction of polymerization of isobutylene [26] and dioxolane [28], which polymerize only by cationic process by Maghnite confirms this cationic aspect. The initiation step occurs by the protonation of the monomer by Maghnite protons, and the platelets of Maghnite take place as a counter-ion.…”

Chemical Modification of Poly(epichlorohydrin) Using Montmorillonite Clay

“…Additionally, elimination of the catalyst (Mag-H ＋ ) can be realized by simple filtration. 25 In the current work, P1 was prepared by cationic ring opening polymerization of 1 in the presence of acetic anhydride. The chemical modification of P1 with different heterocyclic amines (2-4) in a THF solution led to formation of the corresponding copolymers (P2-P4) in a moderate yield.…”

“…[7][8][9][10][11] Much attention has been paid to the modification of PECH with a large number of nucleophiles such as azides, 12 carbazole, 13 carboxylates, 14,15 sulphur compounds 12,[16][17][18] and phenolates [19][20][21] either under conventional conditions or under phase transfer catalysis (PTC) conditions. [22][23][24] On this basis, the present work deals with the preparation of PECH through cationic ring opening polymerization followed by nucleophilic displacement of chlorine functionality with heterocyclic amines using Mghnite-H ＋ catalyst, a new non-toxic cationic initiator, heterocyclic monomers 25,26 and vinyl monomers. 27,28 The catalyst can be easily separated later from the polymer product and regenerated by heating at a temperature above 100 ℃.…”

Solvent free Cationic Copolymerization of 2-Chloroethyl Vinyl Ether with Styrene Catalyzed by Maghnite-H+, a Green Catalyst

“…Solvent-free techniques, green solvents, water 6 , phase-transfer catalysts, or ionic liquids 7 have replaced hazardous, toxic and volatile organic solvents 8 . On the other hand, enzymes [9][10][11][12][13][14][15] , silica gel and silica-supported reagents 16 , as well as clay minerals [17][18][19][20][21][22][23][24][25] are increasingly being used as catalysts. Furthermore, all reactions in this study are conducted at room temperature [19][20][21][22][23][24][25] .…”