Pyrolysis Process of Poly(etyliminoalane) to AlN

Abstract

The pyrolysis process of cage-type poly(ethyliminoalane) was explored by analyzing evolved gases and pyrolyzed products. Poly(ethyliminoalane) was converted into a cross-linked structure below 300 degree. One possible mechanism involves the formation of ethylene and ethylamine via heterolytic Al-N bond cleavage and attack of terminal nitrogen on an ethyl group, and the other is due to cross-linking involving cage opening without gas evolution. In the temperature range of 300 - 650 degree, the evolution of ethylene, ethane, and methane were observed. The loss of AlH groups up to 400 degree appears to result in the conversion of HAlN₃ environment into cross-linked environments, such as an AlN₄ environment.