【摘要】 为了探究纤维孔隙结构对微纤化纤维素制备过程中机械解离能耗的影响,采用低温氮吸附法分析了不同酶用量对复合纤维素酶预处理漂白麦草纤维孔隙结构的影响。结果表明:随着酶用量的增加,纤维BET比表面积和总孔容均呈现先降低后增加,再降低再增加的"W"型变化。通过分析筛分后纤维各组分孔隙结构的变化,发现纤维细胞壁上的孔隙相对集中在细小纤维组分上,当酶用量较低时,细小纤维含量下降是造成纤维BET比表面积和总孔容减小的主要因素,当酶用量较高时,纤维细胞壁孔隙间转化程度明显增加,孔隙结构的变化是影响纤维BET比表面积的主要因素。更多还原

【Abstract】 In order to study the effect of fiber pore structure on the mechanical dissociation energy consumption during the preparation of microfibriled cellulose( MFC),low-temperature nitrogen adsorption method was used to analyze the effect of different dosages of compound cellulase pretreatment on the pore structure of bleached wheat straw fiber. The results showed that the BET specific surface and total entrance of fiber pore all had "W"type change of decreasing,increasing,then decreasing and increasing again with the increase of dosages of enzyme. By analyzing the changes of pore structure of fiber components after screening,it was found that the pores in cell wall relatively concentrated in fiber fines. And thus the main decreasing factor of BET specific surface and total entrance was the decline of fines content during the lower dosage of enzyme. While the dosage of enzyme was higher,transformation of fiber pores was significantly intensified and the change of porosity in the fiber cell walls was consequently the main factor which influenced the fiber BET specific surface.更多还原