Tensile Stress Enhances Moisture Sorption by Increasing Cellulose Hydroxyl Accessibility in Wood Cell Walls

IF 5.9 2区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

Biomacromolecules Pub Date : 2026-09-14 Epub Date: 2026-08-28 DOI:10.1021/acs.biomac.6c01305

Fengze Sun, Wenjuan Zhao, Yujing Tan, Kaiwen Chen, Yi Kong, Hui Peng, Zhu Li, Jiali Jiang, Tianyi Zhan, Chi Zhang, Jianxiong Lyu

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Abstract

Mechanical loading coupled with moisture sorption causes mechano-sorptive creep in wood, but its molecular origin remains unclear. Here, DMA, in situ tensile FTIR, SAXS/WAXS, and MD/GCMC simulations were combined to examine molecular and nanostructural changes in wood cell walls during sorption under tensile stress. Adsorption under stress produced a higher moisture content than stress-free adsorption, whereas viscoelastic creep at constant relative humidity caused no additional uptake. The enhancement was most evident when the loading was approximately parallel to cellulose microfibrils. FTIR revealed changes in cellulose hydroxyl environments consistent with increased accessibility, while SAXS/WAXS showed enlarged interfibrillar distances with nearly unchanged crystalline lattice spacings. Simulations further indicated reduced polymer–polymer hydrogen bonding, greater solvent-accessible surface area, and pore opening during simultaneous adsorption and loading. Together, these findings link tensile-stress-induced cellulose hydroxyl accessibility to enhanced moisture sorption in the wood cell walls.

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查看原文本刊更多论文

拉伸应力通过增加木材细胞壁中纤维素羟基的可及性来增强吸湿性

机械加载和吸湿作用引起木材的机械吸附蠕变，但其分子起源尚不清楚。在这里，DMA、原位拉伸FTIR、SAXS/WAXS和MD/GCMC模拟相结合，研究了拉伸应力下木材吸附过程中细胞壁的分子和纳米结构变化。应力吸附比无应力吸附产生更高的含水率，而恒定相对湿度下的粘弹性蠕变不会产生额外的吸收。当加载与纤维素微原纤维近似平行时，这种增强最为明显。FTIR显示纤维素羟基环境的变化与可及性的增加一致，而SAXS/ waxs显示纤维间距离增加，晶体间距几乎不变。模拟进一步表明，在同时吸附和加载过程中，聚合物-聚合物氢键减少，溶剂可达表面积增加，孔隙重新打开。总之，这些发现将拉伸应力诱导的纤维素羟基可及性与木材细胞壁中增强的吸湿性联系起来。

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来源期刊

Biomacromolecules 化学-高分子科学

CiteScore

10.60

自引率

4.80%

发文量

417

审稿时长

1.6 months

期刊介绍： Biomacromolecules is a leading forum for the dissemination of cutting-edge research at the interface of polymer science and biology. Submissions to Biomacromolecules should contain strong elements of innovation in terms of macromolecular design, synthesis and characterization, or in the application of polymer materials to biology and medicine. Topics covered by Biomacromolecules include, but are not exclusively limited to: sustainable polymers, polymers based on natural and renewable resources, degradable polymers, polymer conjugates, polymeric drugs, polymers in biocatalysis, biomacromolecular assembly, biomimetic polymers, polymer-biomineral hybrids, biomimetic-polymer processing, polymer recycling, bioactive polymer surfaces, original polymer design for biomedical applications such as immunotherapy, drug delivery, gene delivery, antimicrobial applications, diagnostic imaging and biosensing, polymers in tissue engineering and regenerative medicine, polymeric scaffolds and hydrogels for cell culture and delivery.