The incorporation of technical lignins into biodegradable polymers to develop sustainable materials is a common valorization strategy for these biomacromolecules. PBSA and Kraft lignin (between 0 and 10 wt%) films were prepared and the phase morphology, miscibility, compatibility and interphase properties of the compounds were evaluated by atomic force microscopy quantitative nanomechanical mapping (AFM-QNM). Complementary differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) analyses were performed. The results suggested strong intermolecular interactions and partial miscibility between the components, with an average interphase thickness of approximately 55 nm. Lignin particles were homogeneously dispersed, having an average diameter of 58–117 nm, and promoted a stiffening effect in the PBSA phase. AFM-QNM measurements provided extensive qualitative and quantitative information on the morphology, nanomechanical properties of individual phases and interphase regions of PBSA/lignin films. This technique allowed a more comprehensive understanding of the compatibility and miscibility of lignin/thermoplastic compounds compared to conventional characterizations of these systems.

将技术木质素掺入可生物降解聚合物中以开发可持续材料是这些生物大分子的常见增值策略。制备了 PBSA 和牛皮纸木质素（0 至 10 wt%）薄膜，并通过原子力显微镜定量纳米力学映射 (AFM-QNM) 评估了化合物的相形态、混溶性、相容性和界面性质。进行了互补差示扫描量热法（DSC）和扫描电子显微镜（SEM）分析。结果表明组分之间存在强烈的分子间相互作用和部分混溶性，平均相间厚度约为 55 nm。木质素颗粒均匀分散，平均直径为 58-117 nm，促进了 PBSA 相的硬化效果。AFM-QNM 测量提供了有关 PBSA/木质素薄膜的形态、单个相的纳米机械特性和相间区域的广泛定性和定量信息。与这些系统的常规表征相比，该技术可以更全面地了解木质素/热塑性化合物的相容性和混溶性。