A long-standing challenge in advanced material design is to transcend the conflict in strength and toughness since they are typically mutually exclusive. In this contribution, we overcome the conflict between the strength and toughness of a bioderived resin by a rational design using a hyperbranched carboxylic oligomer. The hyperbranched crosslinker established a platform for the conjugation of functional moieties and further tailored the mechanical properties of the resin. The obtained resin transcends the constraints of limited mechanical properties, attaining a spectacular increase in tensile strength (>240 %) and toughness (>837.1 %). Further, the adhesion strength (27.21 MPa) of the optimized resin to cellulose unveiled its suitability for natural fiber-reinforced composite fabrication. As proof of concept, the resin was integrated into plain weave cellulose long filament mats to fabricate an advanced biocomposite. The biocomposite displayed excellent flexural strength (353.86 ± 26.60 MPa) and stiffness (37.27 ± 2.58 GPa), disclosing its suitability in advanced lightweight structural applications.

中文翻译：

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基于超支化交联的生物源树脂的强度和韧性及其在纤维素长丝增强聚合物复合材料中的应用

先进材料设计中长期存在的挑战是克服强度和韧性之间的冲突，因为它们通常是相互排斥的。在这项贡献中，我们通过使用超支化羧基低聚物的合理设计克服了生物源树脂的强度和韧性之间的冲突。超支化交联剂建立了功能部分缀合的平台，并进一步定制了树脂的机械性能。所得树脂超越了机械性能有限的限制，拉伸强度（>240%）和韧性（>837.1%）显着提高。此外，优化后的树脂与纤维素的粘合强度（27.21 MPa）表明其适用于天然纤维增强复合材料的制造。作为概念验证，该树脂被整合到平纹纤维素长丝垫中，以制造先进的生物复合材料。该生物复合材料表现出优异的弯曲强度（353.86 ± 26.60 MPa）和刚度（37.27 ± 2.58 GPa），揭示了其在先进轻质结构应用中的适用性。