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Preparation and Characterization of Lignin-Containing Cellulose Nanofibril from Poplar High-Yield Pulp via TEMPO-Mediated Oxidation and Homogenization
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-02-14 00:00:00 , DOI: 10.1021/acssuschemeng.8b06355 Yangbing Wen 1, 2 , Zhaoyang Yuan 3 , Xiongli Liu 1 , Jialei Qu 1 , Shuo Yang 1 , An Wang 1 , Chunping Wang 1 , Bing Wei 4 , Jianfeng Xu 5 , Yonghao Ni 1, 6
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-02-14 00:00:00 , DOI: 10.1021/acssuschemeng.8b06355 Yangbing Wen 1, 2 , Zhaoyang Yuan 3 , Xiongli Liu 1 , Jialei Qu 1 , Shuo Yang 1 , An Wang 1 , Chunping Wang 1 , Bing Wei 4 , Jianfeng Xu 5 , Yonghao Ni 1, 6
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In this study, a poplar high-yield pulp [preconditioning refiner alkaline peroxide mechanical pulp (P-RC APMP)] was used to produce lignin-containing cellulose nanofibril (LCCNF) dispersions through a sequential process of 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation followed by high pressure homogenization. To produce LCCNF with different lignin contents, sodium hypochlorite loadings of 4–12 mmol/g fiber during TEMPO-mediated oxidation step were explored. The effect of lignin content on morphology, thermal stability, crystallinity, and rheological properties of the produced LCCNFs was investigated. The results showed that the TEMPO-mediated oxidation of cellulose was largely limited to the fiber surface. The residual lignin on the surface of LCCNF was presented as small particles. The increase of lignin content increased the thermal stability and decreased the viscosity of the LCCNF. Moreover, at higher lignin content, greater flocculation and aggregation of fibrils took place, which resulted in lower gel-like characteristics of the resultant LCCNF. The results of water contact angle determination also demonstrated that the increase of lignin content significantly increased the hydrophobicity of the LCCNF.
中文翻译：
杨木高产纸浆中TEMPO介导的氧化均质法制备木质素纤维素纳米原纤维及其表征
在这项研究中，杨木高产纸浆[预处理精制碱过氧化物机械纸浆（P-RC APMP）]被用于通过2,2,6,6-的顺序过程生产含木质素的纤维素纳米原纤维（LCCNF）分散体四甲基哌啶-1-氧基（TEMPO）介导的氧化，然后高压均质。为了生产具有不同木质素含量的LCCNF，在TEMPO介导的氧化步骤中，探索了4–12 mmol / g纤维的次氯酸钠负载量。研究了木质素含量对所生产LCCCNF的形貌，热稳定性，结晶度和流变性质的影响。结果表明，TEMPO介导的纤维素氧化主要限于纤维表面。LCCNF表面上残留的木质素呈小颗粒状。木质素含量的增加增加了LCCNF的热稳定性并降低了其粘度。此外，在较高的木质素含量下，发生了更大的絮凝和原纤维聚集，这导致所得LCCNF的较低的凝胶状特征。水接触角测定的结果还表明，木质素含量的增加显着增加了LCCCN的疏水性。
更新日期：2019-02-14
中文翻译：
杨木高产纸浆中TEMPO介导的氧化均质法制备木质素纤维素纳米原纤维及其表征
在这项研究中，杨木高产纸浆[预处理精制碱过氧化物机械纸浆（P-RC APMP）]被用于通过2,2,6,6-的顺序过程生产含木质素的纤维素纳米原纤维（LCCNF）分散体四甲基哌啶-1-氧基（TEMPO）介导的氧化，然后高压均质。为了生产具有不同木质素含量的LCCNF，在TEMPO介导的氧化步骤中，探索了4–12 mmol / g纤维的次氯酸钠负载量。研究了木质素含量对所生产LCCCNF的形貌，热稳定性，结晶度和流变性质的影响。结果表明，TEMPO介导的纤维素氧化主要限于纤维表面。LCCNF表面上残留的木质素呈小颗粒状。木质素含量的增加增加了LCCNF的热稳定性并降低了其粘度。此外，在较高的木质素含量下，发生了更大的絮凝和原纤维聚集，这导致所得LCCNF的较低的凝胶状特征。水接触角测定的结果还表明，木质素含量的增加显着增加了LCCCN的疏水性。
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