纤维素和木质纤维素纳米纤维悬浮液和薄膜：比较。

Cellulose and lignocellulose nanofibril suspensions and films: A comparison.

机构信息

Laboratory of Renewable Nanomaterials, School of Forest Resources, University of Maine, 5755 Nutting Hall, Orono, ME, 04469, USA; Advanced Structures and Composites Center, University of Maine, 35 Flagstaff Road, Orono, ME, 04469, USA.

出版信息

Carbohydr Polym. 2020 Dec 15;250:117011. doi: 10.1016/j.carbpol.2020.117011. Epub 2020 Aug 31.

DOI:10.1016/j.carbpol.2020.117011

PMID:33049872

Abstract

A comparative study on the morphology and physico-mechanical properties of cellulose nanofibrils (CNF) and lignocellulose nanofibrils (LCNF) produced using a pilot-scale ultra-refining facility in the form of slurries and films was conducted. Suspensions and films of CNF and LCNF at different fines contents from 50% to 100% were prepared from bleached kraft pulp and old corrugated container (OCC) feedstock, respectively. We showed that the effect of film density on mechanical properties of CNF and LCNF films can outweigh the effect of fines content (or degree of fibrillation) and consequently an equally strong and stiff film can be produced from lower grades of CNF or LCNF at higher densities. After density normalization, particle size was found to be the main determining factor. Finally we conclude that a CNF or LCNF suspension with 70 % fines will yield films as strong and stiff as the materials with 100 % fines providing an opportunity for cost reduction.

摘要

采用中试规模的超微细化设备，以浆料和薄膜的形式对纤维素纳米纤维（CNF）和木质纤维素纳米纤维（LCNF）的形态和物理机械性能进行了对比研究。分别以漂白硫酸盐浆和旧瓦楞纸箱（OCC）为原料，制备了不同 fines 含量（50%至 100%）的 CNF 和 LCNF 的悬浮液和薄膜。我们表明，薄膜密度对 CNF 和 LCNF 薄膜机械性能的影响可以超过 fines 含量（或打浆度）的影响，因此，在较高密度下，可以从较低等级的 CNF 或 LCNF 生产出同样强韧的薄膜。在密度归一化后，粒径被发现是主要的决定因素。最后，我们得出结论，具有 70% fines 的 CNF 或 LCNF 悬浮液可以生产出与具有 100% fines 的材料一样强韧的薄膜，这为降低成本提供了机会。