The increasingly severe plastic pollution has urged an inevitable trend to develop biodegradable plastic products that can take over synthetic plastics. As one of the most abundant natural polymers, polysaccharides are an ideal candidate to substitute synthetic plastics. The rigidity of polysaccharide chains principally allows for high strength and stiffness of their materials, however, challenges the facile orientation in material processing. Here, a general hydrogen bond-mediated plasticization strategy to regulate isotropic sodium alginate (SA) chains to a highly ordered state is developed, and alginate plastics with high performances are fabricated. It is revealed that hydroxyl groups in glycerol modulate the viscoelasticity of SA solids by forming strong hydrogen bonds with SA chains, achieving a large stretchability at a high solid content. Highly orientated alginate films exhibit a superior tensile strength of 575 MPa and toughness of 60.7 MJ m⁻³, outperforming most regenerated biomass films. The high solid content and large stretchability mediated by strong hydrogen bonding ensure plastic molding of solid-like SA with high fidelity. This hydrogen bond-mediated plasticity provides a facile but effective method to justify the high performances of polysaccharide-based plastics.

中文翻译：

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氢键介导的高性能海藻酸盐塑料的强塑化

日益严重的塑料污染促使开发可生物降解的塑料产品取代合成塑料成为必然趋势。作为最丰富的天然聚合物之一，多糖是替代合成塑料的理想候选者。多糖链的刚性主要允许其材料具有高强度和刚度，然而，对材料加工中的轻松取向提出了挑战。在此，开发了一种通用的氢键介导的塑化策略，将各向同性海藻酸钠（SA）链调节至高度有序状态，并制造了高性能的海藻酸盐塑料。研究表明，甘油中的羟基通过与SA链形成强氢键来调节SA固体的粘弹性，从而在高固含量下实现大的拉伸性。高度定向的藻酸盐薄膜表现出优异的拉伸强度（575 MPa）和韧性（60.7 MJ m ^-3），优于大多数再生生物质薄膜。强氢键介导的高固含量和大拉伸性确保了类固体SA的塑料成型的高保真度。这种氢键介导的可塑性提供了一种简便而有效的方法来证明多糖基塑料的高性能。