Abstract
The cationic ring-opening polymerization reaction of tetrahydrofuran at 20 °C was catalyzed by H3PW12O40·13H2O as solid acid catalyst. The effect of the proportions of acetic anhydride and catalyst, reaction time and support on the polymerization reaction was investigated. It has been found that the yield and the viscosity of the polymer depend on the proportion of acetic anhydride, the presence of the latter in the reactant mixture being required for the ring-opening. The catalytic activity of the alumina-supported heteropolyacid results showed that Brønsted acid sites are more effective than Lewis ones for the cationic ring-opening polymerization.
Highlights
Due to their high polarizability and flexibility, polyethers constitute a very important soft segment for producing thermoplastic elastomers such as polyesters (Hytrel®) and polyurethanes (Spandex).They represent a key ingredient in the production of a variety of elastomeric products
In our previous paper [21] we have reported the polymerization of tetrahydrofuran catalyzed by a series of heteropolyanions and initiated by acetic anhydride (AA)
The identity of the synthesized H3PW12O40.13H2O was proven by comparison of its FTIR and thermogravimetric analysis data with those reported in literature [22]
Summary
Due to their high polarizability and flexibility, polyethers constitute a very important soft segment for producing thermoplastic elastomers such as polyesters (Hytrel®) and polyurethanes (Spandex). They represent a key ingredient in the production of a variety of elastomeric products. Increasing environmental concerns in recent years have resulted in a demand for Molecules 2010, 15 more effective catalytic processes. In this regard, studies have been carried out on the development of solid acids to replace aggressive and dangerous homogeneous acids to overcome the problems of separating the catalyst from the products and the disposal of solid/liquid wastes
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