Hydrotalcite Materials Research Articles

Thermal decomposition of Mg, Al-hydrotalcite material

The effect of by-products obtained during the low-temperature synthesis of Mg, Al- hydrotalcite on further thermal decomposition of hydrotalcite material was studied by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and infrared spectroscopy. By-products, which thermally decomposed below 450°C, led to the formation of α-Al2O3 and MgO; by-products which completely decomposed above 500°C resulted in the formation of MgAl2O4 and a sharp increase in MgO dispersity.

Stereospecific polymerization of propylene oxide on thermally activated synthetic hydrotalcite

The stereodirecting influence of a thermally activated synthetic hydrotalcite material on the polymerization of propylene oxide has been demonstrated. Racemic propylene oxide can be polymerized to yield a crystalline, isotactic polymer fraction and a liquid, atactic fraction. ( S)-(-)propylene oxide, under similar conditions, yields an optically active crystalline fraction and a liquid fraction of considerably reduced optical activity. Both liquid fractions exhibit a high degree of regioirregularity in the polymer chain.