ABSTRACT

The present work describes the synthesis, characterisation and antimicrobial activity of lignin-polylactic acid (PLA) blended film. Film was prepared using co-polymerisation reaction of lignin and lactic acid in the presence of stannous chloride as a catalyst and poly(vinyl alcohol) to get the uniform film. The properties of the film was studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA), respectively. The lignin-PLA film demonstrated a significant decrease in swelling ratio and tensile strength in contrast to PLA film. SEM analysis revealed proper blending of lignin into PLA matrix with slightly rough surface. Film was thermostable and amorphous in nature as confirmed from the thermal study and XRD analysis, respectively. Further, significant improvement was observed in antimicrobial activity and biodegradability of PLA film after addition of lignin, which suggest the putative application of lignin-PLA film as the food packaging and mulch film materials.

摘要

目前的工作描述了木质素-聚乳酸 (PLA) 混合薄膜的合成、表征和抗菌活性。在氯化亚锡作为催化剂和聚（乙烯醇）的存在下，使用木质素和乳酸的共聚反应制备薄膜以获得均匀的薄膜。分别通过扫描电子显微镜(SEM)、X射线衍射(XRD)、差示扫描量热法(DSC)和热重分析(TGA)研究了薄膜的性能。与 PLA 薄膜相比，木质素-PLA 薄膜的溶胀率和拉伸强度显着降低。SEM 分析表明木质素适当混合到 PLA 基质中，表面略粗糙。分别从热研究和 XRD 分析证实，薄膜在性质上是热稳定的和无定形的。更多，