| The thermal lifetime and degradation kinetics of styrene-diene-styrene triblock copolymers(SIS,SBS and SI/BS) were investigated by thermogravimetry.The results showed that the initial thermal degradation temperatures of SIS,SBS and SI/BS at nitrogen atmosphere were 499.8,630.2 and 582.9 K respectively indicating that the thermal stability of SBS was better than those of SIS and SI/BS;the diffusion process was predominant during the thermal degradation of SIS,the random nucleation and then growth process was predominant during the thermal degradations of SBS and SI/BS,and the activation energies of thermal degradations for SIS,SBS and SI/BS were 196.8,298.3 and 349.9 kJ·mol-1 respectively;and the order of thermal lifetimes was SIS＞SI/BS＞SBS. |
