双增PLA/PBAT/TiO2复合材料的制备及性能研究

以机械共混的方法制备聚乳酸(PLA)/聚己二酸/对苯二甲酸丁二酯(PBAT)/Ti O2复合材料,对复合材料的热性能、力学性能和晶体结构进行研究与分析。研究发现:PBAT与Ti O2的加入能增韧增强PLA/PBAT/Ti O2复合材料,并能提高复合材料的热稳定性;随着PBAT含量的增加,PLA/PBAT/Ti O2复合材料的断裂伸长率先增后减,拉伸强度先不变后急剧下降,当PBAT含量为40%时样品的断裂伸长率达到极大值,PBAT含量为50%时样品的拉伸强度急剧下降;在熔融过程中,PLA/PBAT/Ti O2复合材料存在玻璃化转变、冷结晶行为和双重熔融转变;且复合材料存在PLA的两种晶型结构-α和β晶型。

Preparations and Properties of Double-strength PLA/PBAT/TiO_2 Composites

PLA/PBAT/Ti O2 composites were prepared by mechanical blending methods. The thermal properties, mechanical properties and crystal structure of the composites were studied and analyzed. The results show that the addition of PBAT and Ti O2 can toughen and strengthen PLA/PBAT/Ti O2 composites and improve the thermal stability of the composites. With the increase of PBAT content, the breaking elongation of PLA/PBAT/Ti O2 composites increases first and then decreases, and the tensile strength of the composites negligibly decreases first and then decreases sharply. When the PBAT content is 40%, the breaking elongation of the samples reaches the maximum value, and when the PBAT content is 50%, the tensile strength drops sharply. Furthermore, during the melting process, the PLA/PBAT/Ti O2 composites exhibit glass transition, cold crystallization behavior and double melt transformation. Moreover, the composites display two crystal structures of PLA - α and β crystal forms.