用胺活化、水活化与超声波活化分别处理了微晶纤维素（MCC）。研究了活化前后微晶纤维素在氢氧化钠-尿素-硫脲中的溶解时间、聚合度、溶解度、纤维表面形态、结晶度以及对分子氢键的影响。结果表明，超声波活化较其他2种活化方法效果更好，且处理功率为60%~99%、处理时间在60~120 min内更有利于改善微晶纤维素的溶解性能。

Microcrystalline cellulose (MCC) was activation treated by amine, water and ultrasonic respectively. The dissolve time in NaOH-Urea-Thiourea solution, degree of polymerization (DP), solubility, the surface of fiber, crystallinity and effect on molecule hydrogen bonding of MCC before and after activation were studied. The result showed that ultrasonic activation is better than the other two activation methods, which is more convenient to improve the dissolvability of MCC with treating power from 60 to 99 percent and treating time from 60 to 120 minutes.