基于双转子连续混炼挤出机的聚乳酸/淀粉共混物的制备及性能
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华东理工大学 绿色高效过程装备与节能教育部工程研究中心,上海 200237

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Preparation and Compatibility of PLA/Starch Composites based on Twin-rotor Continuous Mixing Extruder
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    摘要:

    以淀粉和PLA为原料,甘油为增塑剂,采用双转子连续混炼挤出机通过熔融共混法制备了PLA/淀粉共混物,研究不同转子转速和甘油含量下共混物的微观结构、流变性能、结晶性能和力学性能,得到剪切作用以及增塑剂含量对共混物两相相容性的影响。对共混物的SEM照片、FTIR谱图以及动态频率扫描曲线进行分析,结果表明适当提高转子转速以及甘油含量有利于提高淀粉的塑化程度,改善淀粉与PLA之间的相容性。DSC曲线表明共混物的结晶度随着甘油含量的提高而降低。当甘油含量为20%,转速为300r/min时,淀粉分散相与PLA基体的相容性最好,共混物具有良好的力学性能,拉伸强度达到25.1MPa,弯曲强度达到33.1MPa。

    Abstract:

    Polylactic acid (PLA)/Starch composites were prepared by melting blending method using a twin-rotor continuous mixing extruder, with starch and PLA as raw materials and glycerin as plasticizer. The microstructure, rheological properties, crystallinity and mechanical properties of the blends under different rotor speed and glycerol content were studied. The effects of shear force and plasticizer content on the two-phase compatibility of the blends were obtained. SEM, FTIR and dynamic frequency scanning curves of the composites were analyzed. The results showed that appropriate increase of rotor speed and glycerol content could improve the plasticization degree of starch and improve the compatibility between starch and PLA. DSC curve showed that the crystallinity of the blend decreased with the increase of glycerol content. When the glycerol content was 20% and the rotation speed was 300r/min, the compatibility between starch dispersed phase and PLA matrix was the best. The blend has good mechanical properties, with tensile strength of 25.1MPa and bending strength of 33.1MPa.

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  • 收稿日期:2022-05-18
  • 最后修改日期:2022-09-14
  • 录用日期:2022-09-21
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