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采用X射线衍射分析和原子力显微镜研究半纤维素含量的变化对再生植物纤维的超分子结构及其成纸性能的影响。结果表明:当半纤维素含量从27.62%降低到9.09%时,3种浆样的结晶指数(CrI)从72.5%增大到82.8%,但垂直002面微晶体尺寸略微增大。随着半纤维素含量的减少,微晶横截面积增大,使晶区反应表面积减小,对纤维素反应的可及度和均一性有不利影响。原子显微镜(AFM)观察到了高半纤维素含量的纤维上有更疏松的聚合结构,而低半纤维素含量的纤维的原纤结构更加紧密。随着回用次数的增加,不同半纤维素含量的再生植物纤维的成纸性能变化趋势相同,但高半纤维素含量的纤维相对抗张指数、相对耐破指数和相对撕裂指数的变化程度较小。
X-ray diffraction (XRD) and atomic force microscopy (AFM) were used to investigate the effect of hemicellulose content on the supramolecular structure of regenerated plant fiber and its paper properties. The results showed that when the content of hemicellulose was reduced from 27.62% to 9.09%, the crystallinity index (CrI) of three kinds of pulp increased from 72.5% to 82.8%, but the size of the 002 surface increased slightly. With the decrease of hemicellulose content, the cross-sectional area of crystallite increases, and the reaction surface area decreases, which affects the accessibility and homogeneity of cellulose reaction. Atomic microscope (AFM) observed a more loose polymeric structure on fibers with a higher hemicellulose content, whereas fibers with a lower hemicellulose content had a more fibrillar structure. With the increase of the times of reuse, the change trend of paper properties of regenerated plant fiber with different hemicellulose contents is the same, but the change of relative tensile index, relative burst index and relative tear index of high hemicellulose content Smaller.