超声波对再生植物纤维结构及其水解反应影响的研究

通过研究超声处理前后再生植物纤维结晶结构、纤维粒度、空隙及分布变化,分析超声波预处理对再生植物纤维水解的影响机理。傅里叶红外光谱(FI-IR)、X-衍射(XRD)分析表明超声处理对再生植物纤维结晶结构影响较小。由粒度变化趋势说明,超声波对再生植物纤维表现为细纤维化和润胀作用。空隙大小的改变,表明超声处理能够激活封闭的空隙结构。同时纤维保水性能随超声处理时间增加而增加。超声处理增加了反应的有效接触面积是促进再生植物纤维水解主要因素,而不是改变其结晶结构。

Effect of ultrasound treatment on the structure and hydrolysis of recycled cellulose fibers

By studying crystalline structure, fiber particles, pore and distribution changes of recycled cellulose fibers treated by ultrasonic wave, influencing mechanism of ultrasonic wave pretreatment on the hydrolysis of recycled cellulose fibers was studied. FI-IR spectroscopy and X-ray diffraction analysis indicated that ultrasonic treatment has little effect on the crystalline structure of recycled cellulose fibers. The changes of particles size of fibers revealed that there are rnechanical fibrillation and swelling effect to ultrasonic wave. The change of pore structure of recycled cellulose fibers measured by accelerated surface area and porosimetery showed that ultrasonic treatment has partially activated the closed pore, leading to the enhancement of fiber swelling perlbrmance with the increasing ultrasonic treatment time. The restllts also show that the increased accessibility area of recycled cellulose fibers of ultrasonic treatment plays a more important role than the change of crystalline structure on the enhancement of hydrolysis of recycled fibers.