Although lignocellulosic biomass has promising applications in biodegradable cellulose-based composite materials due to its high specific surface area and high rigid intensity, lignocellulosic fiber with multiple surface reactive sites and intact spatial structure is still a great challenge as a versatile carrier for composite materials. Herein, a feasible strategy that combined alkaline hydrogen peroxide (AHP) impregnation and two-step mechanical refining was presented to treat the pondcypress (taxodium ascendens) for enhancing cellulose accessibility and specific surface area. Additionally, the prepared pondcypress fiber kept the intact spatial structure. First, the destruction of molecular structure barrier was synergistically realized by the NaOH and H₂O₂, that improved the efficiency of 2nd mechanical refining. Subsequently, the fibers exhibited an excellent dissociated result under the effect of shear stress and friction at low energy consumption (1637 kW h/t). As a result, the fibers achieved ultrahigh cellulose accessibility of 77.07 % and high surface active hydroxyl content of 2.164 × 10⁻³ mol/g due to the exposure of S2 cell wall at the 16 % H₂O₂ and 17.5 % NaOH. Moreover, despite the fibers were fibrillated after treatments, the intact spatial structure of fiber was observed by SEM. These results confirm that AHP impregnation and two-step mechanical refining are an effective method to dissociate the fiber, and this work opens up more avenues to use the lignocellulosic fiber in cellulose-based composite materials.

尽管木质纤维素生物质由于其高比表面积和高刚性强度在可生物降解的纤维素基复合材料中具有广阔的应用前景，但具有多个表面反应位点和完整空间结构的木质纤维素纤维作为复合材料的通用载体仍然是一个巨大的挑战。在此，提出了一种将碱性过氧化氢 (AHP) 浸渍和两步机械精炼相结合的可行策略，用于处理池塘柏（红杉）以提高纤维素的可及性和比表面积。此外，制备的松柏纤维保持了完整的空间结构。首先，通过NaOH和H ₂ O ₂协同实现分子结构屏障的破坏，提高了二次机械精炼的效率。随后，纤维在低能耗（1637 kW h / t）下在剪切应力和摩擦的作用下表现出优异的解离结果。结果，由于 S2 细胞壁暴露在 16 % H ₂ O _{2 下}，纤维实现了 77.07 % 的超高纤维素可及性和 2.164 × 10 ^-3 mol/g 的高表面活性羟基含量和 17.5% NaOH。此外，尽管纤维在处理后原纤化，但通过扫描电镜观察到纤维的完整空间结构。这些结果证实，AHP 浸渍和两步机械精炼是一种有效的解离纤维的方法，这项工作为在纤维素基复合材料中使用木质纤维素纤维开辟了更多途径。