Cyclic polyesters prepared by poly(oxypropylene oxymaloyl) ring-chain reactions

Abstract

Abstract. The synthesis of cyclic polyesters of poly(oxypropylene oxymaloyl) from a ring-chain reaction was carried out at 40°C with 'Maghnite' an acid exchanged montmorillonite as acid solid ecocatalyst (Mag-H + ). 'Maghnite' is already used as catalyst for polymerization of many vinylic and heterocyclic monomers [1]. The effect of amount of catalyst on yield and molecular weight of polymer was studied. A typical reaction product was analyzed by gel permeation chromatography (GPC) as well as by nuclear magnetic resonance spectroscopy ( 1 H-NMR) and the existence of cyclic species was proven.

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

“…By examining the literature, we find that the studies of the catalytic properties of natural clay for polymerization of Limonene are practically nonexistent. The main purpose of this work is to synthesis a green polymer from a green raw material and to investigate the catalytic properties of a natural clay (Mag-H + ) as new and non-toxic catalyst for the polymerization of Limonene, in our previously published work we have shown the advantage of different applications of this catalyst type in several polymerization reactions [15][16][17][18]. It is preferred for its many advantages such as very low purchase price compared to other catalysts and the easy removal of the reaction mixture, regenerated by heating to a temperature above 100 °C [19][20].…”