滑石粉改性PBAT/PLA复合材料的制备及性能研究

Preparation and Properties of Talcum Modified PBAT/PLA Composites

以熔融共混法制备了聚对苯二甲酸-己二酸丁二醇酯/聚乳酸/滑石粉(PBAT/PLA/Talc)复合材料,研究了Talc含量对复合材料力学性能、微观结构、热力学性能及流变性能的影响。结果表明:随着Talc含量的增加,PBAT/PLA/Talc的拉伸强度先下降后上升,标称应变由22.91%升至241.54%,再降至35.11%;弯曲模量从1.57 GPa逐渐提升至2.61 GPa。随着Talc含量的增大,PBAT/PLA/Talc复合材料的结晶温度升高,熔融温度有所降低。体系的黏度随Talc含量的增加呈现先下降后上升的趋势,Talc含量为5份时,PBAT/PLA/Talc复合材料的黏度最低。因此,Talc可改善PBAT、PLA的界面相容性,对复合材料熔体流动具有较大影响。

Poly(butyleneadipate-co-terephthalate)/polylactic acid/talcum(PBAT/PLA/Talc) composites were prepared by melt blending. The effects of Talc content on the mechanical properties, microstructure, thermodynamic properties and rheological properties of the composites were studied. The results show that with the increasing of Talc content, the tensile strength of PBAT/PLA/Talc is decreased first and then increased, and the nominal strain is increased from 22.91% to 241.54%, and then is decreased to 35.11%. The flexural modulus is gradually increased from 1.57 GPa to 2.61 GPa. With the increasing of Talc content, the crystallization temperature of PBAT/PLA/Talc composites is increased and the melting temperature is decreased. The viscosity of the system is decreased first and then increased with the increasing of Talc content. When the Talc content is 5 phr, the viscosity of PBAT/PLA/Talc composite is the lowest. Therefore, Talc can improve the interfacial compatibility of PBAT and PLA, which has a great influence on the melt flow of composites.