Abstract Polylactic acid (PLA) is one of the main components of biodegradable and biocompatible composites. Bacterial cellulose from kombucha membranes is an excellent candidate to be used as a natural filler of eco-composites because it is renewable, has low cost, low density, and acceptable specific strength properties, and is biodegradable. The study aimed to prepare composites of PLA and bacterial cellulose to produce a biodegradable and compostable material. The bacterial microcellulose was obtained from kombucha membranes and blended with PLA by extrusion. The composites contained a PLA with 1%, 3%, and 5% of cellulose. We characterized the PLA, bacterial microcellulose, and composites to ascertain their size and aspect, degree of crystallinity, distribution of the cellulose into PLA, and their mechanical properties. We observed an increase in crystallinity proportional to the cellulose content for the blends and found that the 3% cellulose blend withstands the stress of up to 40 MPa and temperatures up to 120°C before distortion.

中文翻译：

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来自康普茶膜的聚乳酸和微纤维素的复合物

摘要 聚乳酸（PLA）是可生物降解和生物相容性复合材料的主要成分之一。来自康普茶膜的细菌纤维素是用作生态复合材料天然填料的绝佳候选材料，因为它是可再生的、成本低、密度低、比强度特性可接受，并且可生物降解。该研究旨在制备 PLA 和细菌纤维素的复合材料，以生产可生物降解和可堆肥的材料。细菌微纤维素从康普茶膜中获得，并通过挤出与 PLA 混合。复合材料包含具有 1%、3% 和 5% 纤维素的 PLA。我们对 PLA、细菌微纤维素和复合材料进行了表征，以确定它们的尺寸和外观、结晶度、纤维素在 PLA 中的分布以及它们的机械性能。