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首页> 外文期刊>Journal of Applied Polymer Science >Agricultural residue-derived lignin as the filler of polylactic acid composites and the effect of lignin purity on the composite performance
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Agricultural residue-derived lignin as the filler of polylactic acid composites and the effect of lignin purity on the composite performance

机译：农业残留物衍生的木质素作为聚乳酸复合材料的填料及木质素纯度对复合性能的影响

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In this study, corn stover lignin with different purities was used as filler in polylactic acid (PLA) matrix. It was found that the impurity metals present in unpurified lignin can significantly affect the performance of the composites in terms of their thermal stability, rheological behavior, mechanical properties, and hydrophobicity. Among the PLA composites, the ones fabricated with the lignin containing 4% of impurities overall had the best thermal stability and tensile strength. From melt rheology analysis, it was also found that the presence of the impurity metals decreases the complex viscosity of the composites. It is suggested that the impurity metals acted as catalysts to promote the interaction between lignin and PLA, resulting in an improved compatibility between PLA and the filler. In the present study, mechanical properties and hydrophobicity of the composites were further improved by acetylating the lignin with the optimum content of impurities. Tensile strength of the composite with the acetylated lignin was comparable to that of pure PLA, whereas the modulus increased to as high as 2.75 GPa. Overall, the study showed that unpurified lignin could be used as filler to achieve similar or better performance than the composites made with highly purified lignin fillers. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47915.
机译：在本研究中，使用不同纯度的玉米秸秆木质素用作聚乳酸（PLA）基质中的填料。结果发现，在未纯化的木质素中存在的杂质金属可以在其热稳定性，流变行为，机械性能和疏水性方面显着影响复合材料的性能。在PLA复合材料中，整体含有4％的杂质的木质素制备的那些具有最佳的热稳定性和拉伸强度。从熔体流变学分析中，还发现杂质金属的存在降低了复合材料的复合粘度。建议杂质金属作为催化剂以促进木质素和PLA之间的相互作用，导致PLA和填料之间的相容性改善。在本研究中，通过用最佳杂质含量乙炔化，进一步改善了复合材料的机械性能和疏水性。用乙酰化木质素的复合材料的拉伸强度与纯PLA的拉伸强度相当，而模量增加至高达2.75GPa。总的来说，该研究表明，未纯化的木质素可以用作填料，以实现与用高度纯化的木质素填料制成的复合材料相似或更好的性能。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47915。

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