PBAT/PLA复合材料的微孔发泡性能

将PBAT作为增韧剂加入PLA基体中得到复合材料,以超临界CO2流体作为物理发泡剂,采用间歇釜式发泡法成功制备了PBAT/PLA复合微孔发泡材料。DSC和WXRD测试结果表明,PBAT与PLA具有良好的相容性。2种材料的复合可以改变PLA晶型,抑制结晶能力,降低材料对温度的敏感性。超临界CO2发泡实验表明,随着PBAT含量的增加,达到相同发泡效果所需的发泡条件也得到了提高。同时,PBAT的加入使泡孔尺寸分布更集中,材料的泡孔结构更均匀稳定。而且,适中的工艺条件和PBAT含量可以获得性能最佳的发泡材料。

Microcellular Foaming Properties of PBAT/PLA Composite

PLA was carried out by melt blending method with the toughening agent PBAT, and the composite foam was prepared by pressure-quench method and using supercritical CO2 as blowing agent. The influences of PBAT content and foaming temperature on the crystallization performance of the composite and cell structure of the foam were investigated. DSC and WXRD results showed that PBAT had good compatibility with PLA. The combination of the two polymers could inhibit the crystallization ability, reduce the sensitivity to temperature. SEM results showed the cell size of the composite foam decreased became worse with the increase of the PBAT content,at the same time, the uniform cell structure became better. By selecting moderate process conditions and PBAT content, the best foaming materials were prepared.