干燥和压榨作用下纤维素水解障碍机理

The Obstacle Mechanism of Fiber Hydrolysis Saccharification during Pressing and Drying Process

中文关键词:  植物纤维  XRD  FT-IR  氢键  分峰拟合

Key Words:plant fiber  XRD  FT-IR  hydrogen bonding  fitting process

中文摘要:

      用广角X射线衍射（XRD）和红外光谱（FT-IR）的高斯函数分峰拟合法研究了植物纤维在干燥和压榨过程中晶型和氢键模式的变化。研究结果表明，随干燥温度和压榨压力的升高，纤维素的结晶度和结晶尺寸增大，证实纤维素链间主要靠分子间氢键结合在一起，稳定纤维素链，而分子内氢键处于辅助地位；随干燥温度的升高，纤维素无定形区的有序化增强，向结晶区转化，而在压力作用下纤维素晶区间存在相互结合；经过不同干燥温度和压榨压力处理后，植物纤维纤维素的水解率下降，葡萄糖产率也随之降低。

Abstract:

      The changes of crystalline form and hydrogen bonding patterns of renewable plant fiber during pressing and drying process were analyzed by X-ray diffraction and FT-IR spectroscopy.The FT-IR spectra of hydrogen-banded OH stretching vibration were resolved into three bands for cellulose I， assuming that all the vibration modes follow Gaussion distribution. Results showed that the crytallinity and crystallite size of cellulose increase with the increasing of drying temperature and squeezing pressure .It has been proved that cellulose chains mainly combine together by hydrogen bonding between molecules，while intramolecular hydrogen bonds take second place. With the increase of drying temperature, the amorphous region of cellulose converts to the crystalline region. And under pressure crystalline regions will combine with each other. After the treatment with different drying temperature and pressing pressure, the hydrolysis rate of the fiber and glucose production rate are reduced.