Transient water vapor diffusion in paper treated with methyltrimethoxysilane modified starch

IF 3 2区 农林科学 Q1 FORESTRY
Wiesław Olek, Waldemar Perdoch, Andreas Treu, Jerzy Majka, Łukasz Czajkowski, Bartłomiej Mazela, Jerzy Weres
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Abstract

The interaction of cellulose paper with water is a major hindrance to its broader application. This study, which introduces a novel approach to understand water vapor diffusion in both untreated and treated paper, aims to identify the diffusion coefficient, a crucial property in improving the hydrophobicity of paper. The treatment process utilized an aqueous solution of starch or starch modified with methyltrimethoxysilane (MTMS). While the initial sorption method is frequently used to determine the diffusion coefficient, this study found that it could lead to significant errors due to the non-Fickian behavior exhibited by lignocellulosic materials. This behavior causes that the hygroscopic equilibrium is not instantly obtained by surface of paper. It also induces slowing down moisture diffusion in its final stage due to molecular relaxation. For the first time, the modified convective boundary condition was introduced into the moisture diffusion model in paper materials. The results from vapor sorption experiments demonstrated this non-Fickian behavior, particularly at high values of air relative humidity. The study also revealed that the commonly applied first kind boundary condition is not applicable, even for thin paper samples, inhibiting the use of the initial sorption method for determining the diffusion coefficient. While the treatment with starch and MTMS significantly improved the hydrophobic properties of paper, it didn’t alter substantially its hygroscopic properties, potentially due to not blocking active sorption sites of cellulose fibers. This research underscores the need for further investigation into the chemical modification of cellulose fibers to improve the hydrophobicity of paper.

甲基三甲氧基硅烷改性淀粉处理纸张中的瞬态水蒸气扩散
纤维素纸与水的相互作用是其广泛应用的主要障碍。本研究引入了一种新的方法来了解未处理和处理过的纸张中的水蒸气扩散,旨在确定扩散系数,这是提高纸张疏水性的关键特性。处理过程使用淀粉水溶液或甲基三甲氧基硅烷(MTMS)改性淀粉。虽然初始吸附法经常用于确定扩散系数,但本研究发现,由于木质纤维素材料所表现出的非菲克行为,它可能导致显著的误差。这种特性导致纸张表面不能立即达到吸湿平衡。由于分子松弛,它还在最后阶段诱导减缓水分扩散。首次将修正后的对流边界条件引入到纸张材料的水分扩散模型中。水蒸气吸附实验的结果证明了这种非菲克行为,特别是在高空气相对湿度值时。研究还发现,通常应用的第一类边界条件并不适用,即使对薄纸样品也不适用,从而抑制了初始吸附法测定扩散系数的使用。虽然淀粉和MTMS处理显著改善了纸张的疏水性,但它并没有实质性地改变其吸湿性能,这可能是由于没有阻断纤维素纤维的活性吸附位点。该研究表明,需要进一步研究纤维素纤维的化学改性以提高纸张的疏水性。
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来源期刊
Wood Science and Technology
Wood Science and Technology 工程技术-材料科学:纸与木材
CiteScore
5.90
自引率
5.90%
发文量
75
审稿时长
3 months
期刊介绍: Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.
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