摘要
利用原子力显微镜(AFM)研究了几种非木材化学浆DQP漂白前后纤维表面超微结构的变化。经过DQP漂白,几种非木材化学浆的白度达到80%以上,脱木素率均超过88%,漂白对几种非木材化学浆的强度有一定的提高,但作用效果因原料种类而异。利用AFM对纸浆纤维表面进行观察,结果表明,漂白前覆盖在纤维表面的颗粒状物质经过漂白后溶出,反映了表面木素的脱除。另外,大量微细纤维暴露出来,图像的相差降低,反映了漂白后纤维表面的亲水性和均一性得到提高,即漂白后纸浆表面性质得到改善,这可能是纸浆强度提高的原因。
The ultrastructures of several non-wood pulps before and after bleaching were studied by Atomic Force Microscopy （AFM）. The results indicated that all non-wood pulps could be bleached to a brightness of above 80% ISO by using a DQP bleaching sequence, with the delignification rate more than 88% and improved strength, but the results vary from different raw materials. The results of AFM showed that the granules covered on fibers surface were disappeared after bleaching, which was ascribed to the removal of fignin. Furthermore, the exposed cellulose microfibrils and the decreased phase contrast indicated the increase of hydrophilicity and homogeneity of fiber surfaces, and the pulp surface properties improved, this probably was the reason of pulp strength improved.
出处
《中国造纸学报》
CAS
CSCD
北大核心
2009年第3期19-23,共5页
Transactions of China Pulp and Paper
