| 摘要: |
| 【目的】探究酶用量、酶解时间及研磨时间对制备的桉树纸浆纤维微/纳纤丝微观形貌及性能的影响。【方法】以桉树纸浆为原料，经不同的酶用量（20，40，60和80 ECU/g）和酶解时间（2，4，6和8 h）预处理后，用研磨法制备纤维素微/纳纤丝，利用扫描电镜、X射线衍射仪对制备的微/纳纤丝进行表征。【结果】在酶解时间为6 h的条件下，当酶用量由20 ECU/g增加至80 ECU/g时，研磨制备的微/纳纤丝直径由143.89 nm减小至52.21 nm；在酶用量为60 ECU/g的条件下，当酶解时间由2 h增加至8 h时，研磨制备的微/纳纤丝直径由131.23 nm减小至43.73 nm。酶处理后的纤维及研磨处理后的纤维均保持了天然纤维的Ⅰ型结构，结晶度分别比纸浆纤维（59.21%）提高 11.68% 和8.31%，所制备的微/纳纤丝的结晶度为67.52%。【结论】酶预处理可以有效降低微/纳纤丝的制备时间，减少能耗；随着酶用量及酶解时间的增加，微/纳纤丝直径逐渐减小；纤维素酶可降解纤维素部分非结晶区并使纤维润胀。 |
| 关键词: 纤维素酶 研磨法 桉树纸浆 微/纳纤丝 |
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| 基金项目:国家林业公益性行业科研专项(201504603) |
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| Effect of cellulose hydrolysis and mechanical grinding on morphology of eucalyptus pulp micro/nano fibers |
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HE Yuchan,HAN Yanming,LI Gaiyun,et al
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| Abstract: |
| 【Objective】The research studied the effects of enzyme dosage, hydrolysis time and grinding time on structural properties of micro/nano fibers.【Method】Eucalyptus pulp was chosen as starting materials and micro/nano fibers were isolated with cellulose hydrolysis and mechanical grinding.The effects of different enzyme dosages (20,40,60,and 80 ECU/g) and hydrolysis times (2,4,6 and 8 h） were investigated.The properties of micro/nano fibers were characterized using scanning electron microscopy (SEM) and X ray diffractometer (XRD).【Result】The diameter of fibril decreased from 143.89 nm to 52.21 nm when the amount of enzyme increased from 20 ECU/g to 80 ECU/g under same hydrolysis times (6 h).When the amount of enzyme was 60 ECU/g and the hydrolysis times increased from 2 h to 8 h,the diameter decreased from 131.23 nm to 43.73 nm.The micro/nano fiber with enzymatic and grinding processes maintained type I structure the crystallinities increased by 11.68% and 8.31% compared to pulp fibers (59.21%).The crystallinity of obtained micro/nano fiber was 67.52%.【Conclusion】Enzyme pre treatment could effectively reduce the preparation time and energy consumption.The micro/nano fiber diameter decreased with the increase of enzyme concentration and reaction time.The cellulose enzyme could decompose amorphous regions between the crystalline micro fibrils and make fibers swell. |
| Key words: enzyme grinding eucalyptus pulp fiber micro/nano fibers |
