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Lignin-Containing Cellulose Nanofibril-Reinforced Polyvinyl Alcohol Hydrogels
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2018-03-13 00:00:00 , DOI: 10.1021/acssuschemeng.7b04172
Huiyang Bian 1, 2 , Liqing Wei 2 , Chunxiang Lin 2, 3 , Qianli Ma 2, 4 , Hongqi Dai 1 , J.Y. Zhu 2
Affiliation  

Two lignin-containing cellulose nanofibril (LCNF) samples, produced from two unbleached kraft pulps with very different lignin contents, were used to produce reinforced polyvinyl alcohol (PVA) hydrogels. The effects of LCNF loading (0.25–2 wt %) and lignin content on the rheological and mechanical properties of the reinforced hydrogels were investigated. The 2 wt % LCNF-reinforced PVA hydrogels exhibited up to a 17-fold increase in storage modulus and a 4-fold increase in specific Young’s modulus over that of pure PVA hydrogel. Both the mechanical and rheological properties of LCNF-reinforced PVA hydrogels can be tuned by varying LCNF loading and LCNF lignin content. During LCNF production, lignin reduced cellulose depolymerization, resulting in LCNF with high aspect ratios that promoted entanglement and physical bridging of the hydrogel network. Free lignin particles generated during LCNF production acted as multifunctional nanospacers that increased porosity of the hydrogels. Because LCNFs were produced from unbleached chemical pulps, which have high yields and do not require bleaching, this study provides a more sustainable approach to utilize lignocelluloses to produce biomass-based hydrogels than by methods using commercial bleached pulps.

中文翻译:

含木质素的纤维素纳米纤维增强聚乙烯醇水凝胶

由两个木质素含量差异很大的未漂白牛皮纸浆制得的两个含木质素的纤维素纳米原纤维(LCNF)样品被用于生产增强聚乙烯醇(PVA)水凝胶。研究了LCNF负载量(0.25–2 wt%)和木质素含量对增强水凝胶的流变和力学性能的影响。与纯PVA水凝胶相比,2 wt%LCNF增强的PVA水凝胶的储能模量提高了17倍,比杨氏模量提高了4倍。可以通过改变LCNF负载量和LCNF木质素含量来调整LCNF增强的PVA水凝胶的机械和流变性能。在LCNF生产过程中,木质素减少了纤维素的解聚作用,从而导致LCNF具有高纵横比,从而促进了水凝胶网络的缠结和物理桥接。LCNF生产过程中产生的游离木质素颗粒充当多功能纳米垫片,可增加水凝胶的孔隙率。由于LCNFs是由未经漂白的化学纸浆生产的,这种纸浆的产率高且不需要漂白,因此与使用商业漂白纸浆的方法相比,本研究提供了一种更可持续的方法来利用木质纤维素生产基于生物质的水凝胶。
更新日期:2018-03-13
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