Poly(butylene-adipate-co-terephthalate)(PBAT)was extensively used in the packaging industry as a biodegradable material.However,it faced challenges,such as,suboptimal thermal stability and environmental degradation.In this study,silicone oil(SO)/PBAT composites with different ratios were prepared by melt blending,and the effects of the heat-resistant additive on the thermal stability and degradability of PBAT were investigated.The results show that the composites have better heat-resistant performance,and the final decomposition temperature is increased to 411.02 ℃ when SO is added up to 0.6％,and the thermal decomposition rate is reduced by 10.34％comparing with that of pure PBAT.The inclusion of SO markedly decelerates the thermo-oxidative aging process of PBAT.Furthermore,it enhances the stability of the degradation of SO/PBAT and results in a higher mechanical property retention rate of 0.6％SO/PBAT after 30 d of thermo-oxidative degradation in comparison to pure PBAT.After 30 d of thermo-oxidative degradation,the incorporation of 0.6％SO into PBAT leads to a 27.48％increase in the retention rate of tensile strength and a 20.78％reduction in the mass loss rate comparing to pure PBAT.Furthermore,the slow down of the decrease in the molecular weight of the composites and the low-field NMR inversion curves demonstrate that the addition of SO could not alter the thermo-oxidative aging mechanism of PBAT.
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