硅油/PBAT复合材料的制备及耐热性能研究

Preparation and Heat Resistance of SO/PBAT Composites

聚己二酸-对苯二甲酸丁二醇酯(PBAT)作为生物可降解材料在包装领域应用广泛,但存在耐热稳定性差、易受环境影响发生老化等问题。本文采用熔融共混的方法,制备了不同添加比的端羟基硅油(SO)/PBAT复合材料,探讨耐热添加助剂对PBAT热稳定性和可降解性能的影响。结果表明,复合材料具有更好的耐热性,当SO质量分数达0.6%时,最终分解温度提高到411.02℃,热分解速率较纯PBAT降低了10.34%。SO的添加显著延缓了PBAT的热氧老化,SO/PBAT降解稳定性得到提升,热氧降解30 d后0.6%SO/PBAT的拉伸强度保持率较纯PBAT提高了27.48%,质量损失率较纯PBAT降低了20.78%。此外,复合材料的分子量下降幅度减缓,低场核磁反演曲线说明SO的添加并未改变PBAT的热氧老化机理。

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.