POE-g-MAH对PLA/PP共混材料界面状态及机械性能的影响

Effect of POE-g-MAH on the Interfacial State and Mechanical Properties of PLA/PP Blends

聚乳酸(PLA)与聚丙烯(PP)的相容性较差,界面相互作用较弱,导致PLA/PP共混材料的力学性能较差。本文通过引入界面增容剂马来酸酐接枝乙烯-辛烯共聚物(POE-g-MAH)以改善PLA/PP共混材料的相容性。并使用转矩流变仪、差示扫描量热仪、扫描电子显微镜、旋转流变仪及电子万能试验机等研究了POEg-MAH对PLA/PP共混材料界面状态及力学性能的影响。研究表明POE-g-MAH改善了PLA与PP的相容性,在PLA和PP相界面处形成了微交联结构,增强了PLA与PP的界面相互作用,提高了材料力学性能。特别是在POE-g-MAH添加量为4 wt%时,PLA/POE-g-MAH/PP共混物的断裂伸长率达到39.3%,相较于PLA/PP共混物提高了10倍。

The compatibility and interfacial interaction of polylactic acid(PLA)and polypropylene(PP)is poor,resulting in poor mechanical properties of PLA/PP blends.In this paper,the interfacial compatibilizer maleic anhydride grafted ethyleneoctene copolymer(POE-g-MAH)was introduced to improve the compatibility of PLA/PP blends.The effects of POE-g-MAH on the interfacial state and mechanical properties of PLA/PP blends were investigated using a torque rheometer,differential scanning calorimeter,scanning electron microscope,rotational rheometer and electronic universal testing machine.It was shown that POEg-MAH improved the compatibility of PLA with PP,formed a micro-crosslinked structure at the interface of PLA and PP,enhanced the interfacial interaction between PLA and PP and improved the mechanical properties of the material.In particular,the elongation at break of the PLA/POE-g-MAH/PP blend reached 39.3%at the POE-g-MAH addition of 4 wt%,which had increased 10 times compared to the PLA/PP blend.