The coatings industry is aiming to replace petrochemical-based binders in products such as paints and lacquers with bio-based alternatives. Native polysaccharide additives are already used, especially as adhesives, and here we show the use of oxidised dextran as a bio-based binder additive. Linear dextran with a molecular weight of 6 kDa was aerobically oxidised in water at the C3-position of its glucose units, catalysed by [(neocuproine)PdOAc]₂(OTf)₂. The resulting keto-dextran with different oxidation degrees was studied using adipic dihydrazide as a crosslinker in combination with the commercial petrochemical-based binder Joncryl®. Coating experiments show that part of the Joncryl® can be replaced by keto-dextran while maintaining the desired performance.

中文翻译：

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区域选择性钯催化右旋糖酐的有氧氧化及其在纸板涂料中作为生物基粘合剂的用途

涂料行业的目标是用生物基替代品取代油漆和清漆等产品中的石化基粘合剂。天然多糖添加剂已经被使用，特别是作为粘合剂，在这里我们展示了氧化葡聚糖作为生物基粘合剂添加剂的用途。分子量为 6 kDa 的线性葡聚糖在 [(neocuproine)PdOAc] ₂ (OTf) ₂催化下，在水中其葡萄糖单元的 C3 位发生有氧氧化。使用己二酸二酰肼作为交联剂与商用石化基粘合剂 Joncryl® 结合，研究了所得的具有不同氧化度的酮葡聚糖。涂层实验表明，部分 Joncryl® 可以被酮葡聚糖取代，同时保持所需的性能。