The present study deals with the effect of ultrasound on the swelling and dissolution behavior of the cellulose pulp. Hardwood, acid sulfite cellulose pulp sheets were sonicated at different temperatures, operated at a fixed frequency (37 kHz) and power (320 watts) to break the intermolecular forces and hydrogen bonds of crystalline region. The obtained samples were evaluated for crystallinity, intrinsic viscosity, molecular weight (MW), molecular weight distribution (MWD) and surface morphology. It was observed that the crystallinity reduced from 61.9 to 18.9 % after 20 min of ultrasound treatment at 30°C, which was equivalent to the swelling at 75°C for 20 min without the use of ultrasound frequency. It was also found that ultrasound pre-treatment significantly decreased the particle size of the slurry and shortened the dissolution time and temperature requirement without affecting the cellulose solution quality.

本研究涉及超声波对纤维素纸浆的溶胀和溶解行为的影响。将硬木酸性亚硫酸纤维素纸浆板在不同温度下进行超声处理，以固定的频率（37 kHz）和功率（320瓦）运行，以破坏分子间力和结晶区域的氢键。评价获得的样品的结晶度，特性粘度，分子量（MW），分子量分布（MWD）和表面形态。观察到，在30℃下超声处理20分钟后，结晶度从61.9％降低至18.9％，这相当于在不使用超声频率的情况下在75℃下膨胀20分钟。