This contribution presents the development of a dry-cast method for the one-step preparation of bio-based films from wood polymers that mimic the bilayered structure of tree bark, the natural protective layer of the tree. In a simplified view, natural bark can be considered as the superposition of an external homogeneous and non-porous layer (outer bark) and a porous substructure layer (inner bark). This work is a first step for the future development of bio-based biomimetic wood coatings. The film had a bark-like appearance and its total density, bulk density and porosity were similar to values measured in natural bark. Furthermore, the structural characteristics of the studied film, namely specific surface area (BET) and pore size distribution, as well as the performance of the water adsorption ability were investigated and discussed.

中文翻译：

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从牛皮纸木质素和醋酸纤维素到模仿树皮的一步制备双层薄膜

这一贡献代表了一种干法铸造方法的发展，该方法用于从木材聚合物一步制备生物基薄膜，该聚合物模仿树皮的双层结构（树皮的天然保护层）。在简化视图中，天然树皮可以被视为外部均质和无孔层（外树皮）和多孔子结构层（内树皮）的叠加。这项工作是生物仿生木器涂料未来发展的第一步。该膜具有树皮状外观，其总密度，堆积密度和孔隙率与天然树皮中测得的值相似。此外，还研究和讨论了所研究薄膜的结构特征，即比表面积（BET）和孔径分布以及吸水性能。