Thermal Stabilities and Thermal Degradation Kinetics of a Styrene-Butadiene-Styrene Star Block Copolymer

摘要

The thermal and thermo-oxidative degradation behaviors of styrene-butadiene-styrene (SBS) star block copolymer were reported using thermogravimetric analysis (TGA). TGA coupled with Fourier Transform Infrared spectroscopy was used to characterize the degradation volatile of SBS in air atmosphere. The thermal degradation kinetics of SBS in nitrogen and air atmospheres was studied in three steps: (1) the activation energies E _α were estimated by iterative method; (2) the proper form of f(α) was deduced by Popescu method; (3) the results obtained by above steps were used in determination pre-exponential factor A.