Poplar alkaline peroxide mechanical pulp (APMP) was used as plant fiber raw material, and it was graded according to the lignin content. The graded raw materials were used to prepare lignin-containing microfibers (LCMFs) by micro-grinding, and then, the lignin-containing microfiber cryogels (LCMF-cryogels) were prepared by vacuum freeze-drying. The particle size distribution, micromorphology and dispersion stability of LCMFs were characterized by laser diffraction particle size analyzer, transmission electron microscopy and Zeta potentiometer. Then, the crystalline structure, pore structure, surface morphology and adsorption properties of LCMF-cryogels were analyzed. In addition, LCMF-cryogels were compared with the microfiber cryogels (MF-cryogels) which use commercial eucalyptus chemical bleaching pulp as raw material. It was proved that using poplar APMP as raw material to prepare cryogels is more advantageous. The results showed that the lower the lignin content in plant materials, the better the oil adsorption ability of cryogels. This is because the binding effect of lignin on the fiber is reduced, which makes the fibrillation of the fiber easier by external mechanical action. The maximum adsorption capacity of LCMF-cryogel for methyl silicone oil is 215 g/g, while that of MF-cryogel prepared from commercial eucalyptus chemical bleaching pulp is 102.5 g/g. The analysis of the properties of raw fiber and the gel pores shows that the change in the fiber morphology caused by different pulping methods has important influence on the development of LCMF-cryogels by mechanical refining. Poplar APMP is more suitable for preparing fiber-based cryogels oil-absorbing materials than commercial eucalyptus chemical bleaching pulp.

中文翻译：

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机械法制备高吸油量超细纤维冷冻凝胶

以杨树碱性过氧化物机械浆（APMP）为植物纤维原料，按木质素含量分级。将分级后的原料通过微粉碎制备含木质素超细纤维(LCMFs)，然后真空冷冻干燥制备含木质素超细纤维冷冻凝胶(LCMF-cryogels)。采用激光衍射粒度分析仪、透射电子显微镜和Zeta电位计对LCMFs的粒径分布、微观形貌和分散稳定性进行了表征。然后，分析了LCMF-cryogels的晶体结构、孔结构、表面形貌和吸附性能。此外，将LCMF-cryogels与使用商品桉树化学漂白纸浆作为原料的超细纤维cryogels（MF-cryogels）进行了比较。实践证明，以杨树APMP为原料制备冷冻凝胶更有优势。结果表明，植物材料中木质素含量越低，冷冻凝胶的吸油能力越好。这是因为木质素对纤维的结合作用降低了，使纤维更容易在外界机械作用下原纤化。LCMF-cryogel对甲基硅油的最大吸附量为215 g/g，而由商品桉树化学漂白浆制备的MF-cryogel的最大吸附量为102.5 g/g。对原纤维性质和凝胶孔隙的分析表明，不同制浆方法引起的纤维形态变化对机械精制LCMF-cryogels的发展有重要影响。