Synthesis and Characterization of Novel Phosphorus-Containing Polyurethane Elastomers

Abstract

Bis(4-aminophenoxy)phenyl phosphine oxide (BAPPO) was synthesized based on phenyl phosphonic dichloride and 4-nitrophenol and characterized by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). Then BAPPO was used to prepare a series of phosphorus-containing polyurethane elastomers (PPUEs) with different phosphorus contents by changing the soft segments. Combustion behaviours and thermal degradation behaviours of the PPUEs and polyurethane elastomer (PUE) were investigated by thermogravimetric analysis (TGA) and microscale combustion calorimetry (MCC). Thermogravimetric analysis result shows that the thermal degradation of polyurethane elastomers is divided into two stages and the thermal stability of PPUE-1 is poorer than that of PUE. The MCC result reveals that the values of the peak heat release rate and total heat release of PPUE-1 are lower than that of PUE made by 3,3’-dichloro-4,4’-diaminodiphenylmethane (MOCA) when they are obtained from the same soft segment.