Wolf Mark H, Izaguirre Nagore, Labidi Jalel, Ribes-Greus Amparo
Research Institute for Materials Technology, Universitat Politècnica de València (UPV), Camino de Vera, s/n, 46022 Valencia, Spain.
Chemical and Environmental Engineering Department, Faculty of Engineering of Gipuzkoa, University of the Basque Country (UPV/EHU), Plaza Europa 1, 20018 Donostia, Spain.
Biomacromolecules. 2025 Sep 8;26(9):6140-6151. doi: 10.1021/acs.biomac.5c01090. Epub 2025 Aug 26.
Biobased chitosan-lignin composite membranes with tailored dielectric and conductive properties were developed using chitosan of high (CS) and low (CS) molecular weight and degree of deacetylation, combined with kraft (KL) and organosolv lignin (OL) as fillers. The membranes were protonated by immersion in 1.0 M sulfuric acid. CS composites exhibit stronger ionic interactions with sulfate groups compared to CS composites, resulting in a dense structure that hinders water absorption and increases fragility. Chitosan interactions with sulfuric acid and lignin restrict the mobility of dielectric relaxations, with KL having a more pronounced effect than OL due to its smaller size and higher phenolic OH content. The membranes act as electrical insulators, exhibiting electron conductivities ranging from 10 to 10 S/cm between -10 and 170 °C, and proton conductivities between 2.9 × 10 and 4.4 × 10 S/cm at 60 °C. These properties make them promising candidates for use as biobased electrolytes in fuel cell applications.
采用高分子量（CS）和低分子量及脱乙酰度的壳聚糖，并与硫酸盐木质素（KL）和有机溶剂木质素（OL）作为填料相结合，制备了具有定制介电和导电性能的生物基壳聚糖 - 木质素复合膜。通过将膜浸泡在1.0 M硫酸中进行质子化处理。与CS复合材料相比，CS复合材料与硫酸根离子表现出更强的离子相互作用，导致形成致密结构，阻碍了吸水并增加了脆性。壳聚糖与硫酸和木质素的相互作用限制了介电弛豫的迁移率，由于KL尺寸较小且酚羟基含量较高，其作用比OL更为显著。这些膜作为电绝缘体，在-10至170°C之间表现出10至10 S/cm的电子电导率，在60°C时质子电导率在2.9×10至4.4×10 S/cm之间。这些特性使其成为燃料电池应用中用作生物基电解质的有前途的候选材料。
