酶预处理协同高压射流对微纤化纤维素特性的影响  

Effect of Enzyme Pretreatment Combined with High Pressure Jet on Physicochemical Properties of Microfibrillated Cellulose

作　　者：王骁 吴雪[1] 赵纯 WANG Xiao;WU Xue;ZHAO Chun(School of Artificial Intelligence,Beijing Technology and Business University,Beijing100048,China)

机构地区：[1]北京工商大学人工智能学院,北京100048

出　　处：《高分子通报》2022年第9期52-59,共8页Polymer Bulletin

基　　金：国家重点研发计划资助(2016YFD0400305)。

摘　　要：纤维素酶预处理方法因其环境友好等特点在微纤化纤维素制备中受到关注。本研究采用不同浓度纤维素酶协同高压射流处理,开展微纤化纤维素的制备研究。实验结果表明,经过酶解协同高压射流处理后,纤维素原纤束直径由几至几十微米下降到几十至几百纳米之间,而纤维素的晶体结构基本未变。粒径分析说明,酶浓度1%(w/w)的纤维素酶协同高压射流处理的纤维素微细化效果较好。酶浓度从0.1%增加至0.5%时,高压射流处理后的纤维素水分散液的黏度增加,热稳定性和纤维素薄膜的拉伸性能增强,0.5%酶协同高压射流处理的微纤化纤维素薄膜平均抗拉强度达到为18.74MPa,1%酶协同高压射流处理的薄膜样品拉伸特性无明显变化,其平均抗拉强度为18.99MPa,平均断裂伸长率为8.74%,平均弹性模量为293.8MPa。Cellulase pretreatment has attracted much attention in the preparation of microfibrillated cellulose due to its environmental friendliness.In this study,different concentrations of cellulase and high pressure jet treatment were used to prepare microfibrillated cellulose.The results show that the diameter of cellulose fibrils was decreased from several or tens of microns to tens or hundreds of nanometers and crystal structure was not changed after cellulase pretreatment and high pressure jet treatment.The particle size analysis shows that the cellulose micronizing level based on 1%(w/w)cellulase pretreatment and high pressure jet treatment is higher.With the increase of enzyme concentration from 0.1%to 0.5%,the viscosity of cellulose aqueous dispersion increased,and the thermal stability and the tensile properties of cellulose films were enhanced.The average tensile strength of the films treated with 0.5%enzyme and high pressure jet treatment is 18.74MPa.The tensile properties of the films treated with 1%cellulase pretreatment and high pressure jet treatment had little change.And the average tensile strength is 18.99MPa,the average elongation at break is 8.74%,and the average elastic modulus is 293.8MPa.

关 键 词：微纤化纤维素 酶预处理 高压射流 微细化 

分 类 号：TQ352.7[化学工程]