木材科学与技术2024，Vol.38Issue(5)：32-38,67,8.DOI:10.12326/j.2096-9694.2024035
毛竹干燥过程中水分变化对其纤维素结晶结构的影响
Effect of Moisture Content Changes on Cellulose Crystal Structure During Moso Bamboo Drying
摘要
Abstract
Water is a crucial factor affecting bamboo's the processing and utilization.The mechanism of water in bamboo can be traced to cellulose crystal structure of bamboo cell walls.X-ray diffraction(XRD)is a useful technique for revealing the structure at the crystalline scale.Therefore,XRD was used to analyze the changes in the crystalline structure of Moso bamboo during dehydration.The results indicated that the crystallinity of Moso bamboo decreased with decreasing moisture content(from 143.9％to 5.7％).The d-spacing and crystalline size of the(200)crystal plane increased with decreasing moisture content.The increment of d-spacing was 0.07 Å,representing a 1.8％increase.This result was mainly attributed to the dehydration-induced shrinkage of amorphous substances,which generated tensile stress in the crystalline region and increased both d-spacing and crystalline size.Conversely,the d-spacing and crystalline size of the(004)crystal plane decreased as moisture content decreased.This might be due to the spiral contraction of the cellulose molecular chains after losing water,which leads to a reduction in crystal length.In conclusion,the crystalline structure underwent transverse expansion and longitudinal contraction after the dehydration of Moso bamboo.This study enriches the theoretical understanding of Moso bamboo's interaction with moisture by revealing the changes in cellulose crystal structure during moisture loss.It also provides a scientific foundation in crystalline aspects for applications such as bamboo drying and crack prevention.关键词
毛竹/水分/结晶度/晶面间距/(200)晶面Key words
Moso bamboo/water/crystallinity/d-spacing/(200)crystal plane分类
农业科技引用本文复制引用
王世钧,张玉霖,陈琦..毛竹干燥过程中水分变化对其纤维素结晶结构的影响[J].木材科学与技术,2024,38(5):32-38,67,8.基金项目
国家自然科学基金项目"基于竹节多尺度结构的干缩经时演变规律及机制研究"(32201639) （32201639）
四川省科技计划项目"基于慈竹超微结构的原位弯曲定型机制研究"(2023NSFSC1166). （2023NSFSC1166）
