Strong, Ductile, and Waterproof Cellulose Nanofibril Composite Films with Colloidal Lignin Particles
Strong, Ductile, and Waterproof Cellulose Nanofibril Composite Films with Colloidal Lignin Particles
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DOI：
10.1021/acs.biomac.8b01364
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发表时间：
2019-02-01
影响因子：
6.2
通讯作者：
Osterberg, Monika
中科院分区：
文献类型：
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作者：
Farooq, Muhammad;Zou, Tao;Osterberg, Monika
脆性阻碍了纤维素纳米原纤维(CNF)薄膜的商业化。合成聚合物和增塑剂的使用是一种已知的迂回现象，会损害产品的生物降解性和碳足迹。在这里，我们利用各种针叶木质硫酸盐木质素的形态来获得强韧的CNF纳米复合膜。胶体木质素粒子(CLP)的最佳含量为10wt%，与不含木质素的CNF薄膜相比，其韧性几乎是CNF薄膜的两倍。与不规则木质素聚集体相比，CLPS使薄膜具有防水、抗氧化性和紫外线屏蔽能力，并具有更好的可见光透过率。基于电子显微镜、动态吸水率分析和TP-DSC分析，我们得出结论：在CNF中，均匀分布的CLP起着滚动轴承润滑剂和应力传递剂的作用。总体而言，我们的研究结果为木质素纳米颗粒在生物聚合物复合材料中的应用开辟了新的途径，这些聚合物复合材料配备了多种功能，可应用于食品包装、净水和生物医学。
Brittleness has hindered commercialization of cellulose nanofibril (CNF) films. The use of synthetic polymers and plasticizers is a known detour that impairs biodegradability and carbon footprint of the product. Herein, we utilize a variety of softwood Kraft lignin morphologies to obtain strong and ductile CNF nanocomposite films. An optimum 10 wt % content of colloidal lignin particles (CLPs) produced films with nearly double the toughness compared to a CNF film without lignin. CLPs rendered the films waterproof, provided antioxidant activity and UV-shielding with better visible light transmittance than obtained with irregular lignin aggregates. We conclude based on electron microscopy, dynamic water sorption analysis, and tp-DSC that homogeneously distributed CLPs act as ball bearing lubricating and stress transferring agents in the CNF matrix. Overall, our results open new avenues for the utilization of lignin nanoparticles in biopolymer composites equipped with versatile functionalities for applications in food packaging, water purification, and biomedicine.