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Z. Florjańczyk, A. Lasota, M. Leśniewska-Mizak

Telechelic oligomers made from ethylene oxide and phosphoric acid.

Structure and transformation into organoaluminum polymers (in English)

Polimery 2004, No 6, 389


DOI: dx.doi.org/10.14314/polimery.2004.389


Summary

The reaction of phosphoric acid with ethylene oxide (EOX) in organic solvents or water has been studied at -5°C to +30°C by means of NMR and MALDI-TOF spectroscopy. Linear telechelic oligomers comprising 4-25 ethylene oxide monomeric units and 3 terminal hydroxyl groups were found to be the main products of this reaction. Side products include cyclic esters, condensation products containing 2-3 phosphorus atoms in the chain and oligodiols. The esters are stable at temperatures up to 170°C; and in water exhibit strong resistance to hydrolysis up to approx. 80°C. Aqueous medium at 100°C in presence of aluminum oxohydroxide in the form of boehmite leads to hydrolysis of one ester bond, in situ yielding a diester, which reacts with the boehmite to form hybrid phosphate-alumoxane structures; with molar ratio of P:Al in such polymers of approx. 1.1. Atransparent colloidal dispersion with abroad molecular weight spread of the polymer component and low limiting viscosity number (about 0.002 cm3/g) is formed. Lowest molecular weight fractions form true solutions in water and DMSO.


Keywords: phosphoric acid, ethylene oxide, oligomeric phosphates, boehmite, hybrid phosphate-alumoxane polymers, chemical structure, MALDI TOF


Z. Florjańczyk, A. Lasota, M. Leśniewska-Mizak

Telechelic oligomers made from ethylene oxide and phosphoric acid. Structure and transformation into organoaluminum polymers (in English)