Preserving Cellulose Structure: Delignified Wood Fibers for Paper Structures of High Strength and Transparency,Biomacromolecules

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Preserving Cellulose Structure: Delignified Wood Fibers for Paper Structures of High Strength and Transparency
Biomacromolecules ( IF 5.5 ) Pub Date : 2018-05-14 00:00:00 , DOI: 10.1021/acs.biomac.8b00585
Xuan Yang ₁ , Fredrik Berthold ₂ , Lars A. Berglund ₁

Affiliation

To expand the use of renewable materials, paper products with superior mechanical and optical properties are needed. Although beating, bleaching, and additives are known to improve industrially produced Kraft pulp papers, properties are limited by the quality of the fibers. While the use of nanocellulose has been shown to significantly increase paper properties, the current cost associated with their production has limited their industrial relevance. Here, using a simple mild peracetic acid (PAA) delignification process on spruce, we produce hemicellulose-rich holocellulose fibers (28.8 wt %) with high intrinsic strength (1200 MPa for fibers with microfibrillar angle smaller than 10°). We show that PAA treatment causes less cellulose/hemicellulose degradation and better preserves cellulose nanostructure in comparison to conventional Kraft pulping. High-density holocellulose papers with superior mechanical properties (Young’s modulus of 18 GPa and ultimate strength of 195 MPa) are manufactured using a water-based hot-pressing process, without the use of beating or additives. We propose that the preserved hemicelluloses act as “glue” in the interfiber region, improving both mechanical and optical properties of papers. Holocellulose fibers may be affordable and applicable candidates for making special paper/composites where high mechanical performance and/or optical transmittance are of interest.

中文翻译：

保持纤维素结构：用于高强度和透明纸结构的木质化木纤维

为了扩大可再生材料的使用，需要具有优异机械和光学性能的纸产品。尽管已知打浆，漂白和添加剂可以改善工业生产的牛皮纸浆纸，但是其性能受到纤维质量的限制。尽管已表明使用纳米纤维素可显着提高纸张性能，但其生产相关的当前成本限制了它们的工业实用性。在这里，我们使用云杉上的简单温和过乙酸（PAA）脱木质素工艺，生产出具有高固有强度（微纤丝角小于10°的纤维为1200 MPa）的富含半纤维素的全纤维素纤维（28.8 wt％）。我们显示，与传统的牛皮纸浆相比，PAA处理可减少纤维素/半纤维素的降解，并更好地保留纤维素纳米结构。具有优异机械性能（杨氏模量为18 GPa，极限强度为195 MPa）的高密度全纤维素纸，是使用水基热压工艺制造的，无需使用打浆剂或添加剂。我们建议，保留的半纤维素在纤维间区域充当“胶水”，从而改善纸张的机械和光学性能。在感兴趣的高机械性能和/或光学透射率的情况下，全纤维素纤维可以是负担得起的并且可用于制造特殊纸/复合材料的候选材料。我们建议，保留的半纤维素在纤维间区域充当“胶水”，从而改善纸张的机械和光学性能。在感兴趣的高机械性能和/或光学透射率的情况下，全纤维素纤维可以是负担得起的并且可用于制造特殊纸/复合材料的候选材料。我们建议，保留的半纤维素在纤维间区域充当“胶水”，从而改善纸张的机械和光学性能。在感兴趣的高机械性能和/或光学透射率的情况下，全纤维素纤维可以是负担得起的并且可用于制造特殊纸/复合材料的候选材料。

更新日期：2018-05-14

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