| 摘要: |
| 【目的】以废弃的丝瓜络为原料，利用其优良的生物理化特性制备高附加值的纳米纤维素晶体（NCC），探索丝瓜络资源高值化综合利用的新途径。【方法】用KOH/NaClO2体系脱除丝瓜络原料中的木质素和半纤维素，制备丝瓜络纯化纤维素，利用纤维形态分析仪分析丝瓜络纯化纤维素的纤维形态，采用超声 硫酸水解法制备高得率的丝瓜络纳米纤维素晶体，并对纳米纤维素晶体的微观形貌、物理和表面化学性质进行了表征。【结果】丝瓜络纯化纤维素的平均直径为26.4 μm，重均长度平均为0.893 nm，卷曲度为6.8%。丝瓜络纳米纤维素晶体直径约10 nm，长度为200～400 nm，Zeta电位为-15.1 mV，结晶度为63.3%。【结论】丝瓜络纯化纤维素是一种潜在的优良制浆纤维原料，棒状丝瓜络纳米纤维素晶体可作为绿色的纳米增强相使用，经冷冻干燥处理后形成的纳米纤维素泡沫体表现出了良好的保温性能。 |
| 关键词: 丝瓜络 丝瓜络纤维素 纳米纤维素晶体 纤维形态 |
| DOI： |
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| 基金项目:国家自然科学基金项目(31000276)；福建省高校杰出青年人才基金项目(JA11071)；福建省高校新世纪优秀人才基金项目(JA12088)；福建农林大学杰出青年基金项目(xjq201208) |
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| Preparation and characterization of nanocellulose crystals from Luffa sponge |
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WU Qiao-mei,CHEN Si-yuan,CHEN Yan-dan
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| Abstract: |
| 【Objective】Taking advantage of the inherent excellent biological and physico-chemical characteristics of waste Luffa sponge,nanocellulose crystals (NCC) were prepared and characterization to improve the comprehensive utilization of Luffa sponge.【Method】Luffa cellulose fibers were purified and isolated via subsequent treatment using KOH and NaClO2,followed by a fiber morphology analysis using Morfi Compact equipment.Luffa sponge nanocellulose crystals (L-NCC) were prepared using the ultrasound assisted sulfuric acid hydrolysis method.Then,the morphological,physical and surface chemical properties of the prepared nanocellulose crystals were investigated.【Result】Luffacellulose fibers with a fiber curl degree of 6.8%,an average width of 26.4 μm and a weight average length of 0.893 nm were purified.The diameter,length,Zeta potential,and crystallinity index of obtained L-NCC were around 10 nm,200-400 nm,-15.1 mV,and 63.3%,respectively.【Conclusion】Luffa cellulose fibers were potentially suitable for pulping.Rod like Luffa sponge nanocellulose crystals could be used as desirable green nanometer reinforcement.The Luffa sponge nanocellulose foams obtained through freeze drying of Luffa sponge nanocellulose suspensions showed favorable thermal insulation performance. |
| Key words: Luffa sponge Luffa cellulose fibers nanocellulose crystals fiber morphology |
