On the thermal degradation of polysulfones IX. The early stages of thermal degradation of poly(1-butene sulfone) and poly(2-methyl-1-pentene sulfone)

Abstract

The early stages of thermal degradation of poly(1-butene sulfone) and poly(2-methyl-1-pentene sulfone) were studied by using a pH meter. The experiments were carried out in the temperature range 110–130 °C in the early conversion range and in a nitrogen atmosphere. The activation energies of early stages of thermal degradation of poly(1-butene sulfone) and poly(2-methyl-1-pentene sulfone) were 270 and 179 kJ/mol in the conversion range 0–0.5%, respectively. Moreover, the activation energies of thermal degradation of SMS sequences of poly(1-butene sulfone) and poly(2-methyl-1-pentene sulfone) were 744 and 601 kJ/mol in the conversion range 0–0.5%, respectively. It was found that poly(2-methyl-1-pentene sulfone) is more sensitive to thermal degradation than poly(1-butene sulfone).