Structural changes of bamboo cellulose in formic acid
Structural changes of bamboo cellulose in formic acid
复制标题
DOI：
10.15376/biores.3.2.297-315
复制
发表时间：
2008-02
期刊：
影响因子：
1.5
通讯作者：
Yong Sun;Lu Lin;Haibo Deng;Jiazhe Li;B. He;Runchang Sun;Pingkai Ouyang
中科院分区：
文献类型：
--
作者：
Yong Sun;Lu Lin;Haibo Deng;Jiazhe Li;B. He;Runchang Sun;Pingkai Ouyang
通过固态 NMR、FTIR 和 X 射线衍射图研究了甲酸处理前后竹纤维纤维素的结构，并与微晶纤维素进行比较。验证并阐述了两种纤维素分子结构的差异。实验结果表明微晶纤维素和竹纤维的结晶或非晶区域存在显着差异。 CP-MAS 13C-NMR 和 FTIR 光谱显示所有样品中都存在 Iα 和 Iβ 形式。酸溶液的作用在结晶区和非晶区同时实现，但对竹纤维的结晶区的作用更强烈。所有纤维素样品都显示出相同的链构象，但氢键模式不同。氢键的吸收度转移到高波数并在处理过程中逐渐降低。 6-OH…O-3'分子间氢键先减少，后逐渐增加，表明纤维素在水解过程中成束在一起。
The structure of cellulose from bamboo fiber before and after treatment in formic acid was investigated in comparison with microcrystalline-cellulose by solid state NMR, FTIR, and X-ray diffraction diagrams. Differences of molecular structures among two kinds of celluloses were validated and expatiated. Results from the experiments indicated notable differences in the crystalline or amorphous region of microcrystalline-cellulose and bamboo fiber. CP-MAS 13C-NMR, and FTIR spectroscopy revealed the presence of Iα and Iβ forms in all of the samples. The effect of acid solution was achieved simultaneously both in the crystalline region and the amorphous region, but there was a more intensive effect on the crystalline region for bamboo fiber. All of the cellulose samples revealed the same chain conformation but a different hydrogen bonding pattern. The absorbency of hydrogen bonds shifted to a high wave number and gradually decreased during treatment. The intermolecular hydrogen bond of 6-OH…O-3′ decreased first, and then increased gradually, which indicated that the cellulose bundled together during hydrolysis.