Thermogravimetric analysis of poly(ester-carbonates) and poly(ester-thiocarbonates)

The thermogravimetric behaviour of poly(ester-carbonates) and poly(ester-thiocarbonates) derived from the diphenol esters 4-hydroxy-phenyl-4-hydroxy-benzoate, 3-hydroxy-phenyl-4-hydroxy-benzoate, 4-hydroxy-phenyl-3-hydroxy-benzoate, and 3-hydroxy-phenyl-3-hydroxy-benzoate with phosgene and thiophosgene was studied by dynamic thermogravimetry. The thermal decomposition temperatures were determined, showing that poly(ester-carbonates) are more stable than poly(ester-thiocarbonates). The kinetics parameters, activation energy, reaction order and pre-exponential factor, were determined by using the Arrhenius relationship and a computer program.