| 杜 超,李海龙,蒙启骏,刘梦茹,詹怀宇.木素对TEMPO氧化竹浆制备纳米纤维素的影响[J].中国造纸学报,2017,32(2):1-6 |
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| 木素对TEMPO氧化竹浆制备纳米纤维素的影响 |
| Effect of Lignin on Nanocellulose Preparation by TEMPO-mediated Oxidation from Bamboo Pulp |
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| DOI：10.11981/j.issn.1000-6842.2017.02.1 |
| 中文关键词: 未漂竹浆 TEMPO氧化 纳米纤维素 薄膜 强度 |
| Key Words:unbleached kraft bamboo pulp TEMPO oxidation nanocellulose films strength |
| 基金项目:广东省科技计划项目(2015A020215007)；国家自然科学基金项目(31370585)；中央高校基本科研业务费专项资金项目(2015ZZ048,2015ZM054)。 |
| 作者 | 单位 | | 杜 超 | 华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 | | 李海龙* | 华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 | | 蒙启骏 | 华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 | | 刘梦茹 | 华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 | | 詹怀宇 | 华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 |
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| 中文摘要: |
| 以卡伯值不同的2种未漂硫酸盐竹浆(卡伯值为25.5和11.7的竹浆分别标记为SHK和SLK)为原料,通过TEMPO/NaBr/NaClO体系氧化及高压均质处理,制备了TEMPO氧化纳米纤维素(TOCN),并利用抽滤法制备TOCN膜。系统地研究了2种竹浆的TEMPO氧化过程、TEMPO氧化浆性能、TOCN性能及TOCN膜的力学性能等,探讨了木素对竹浆TEMPO氧化过程和TOCN制备的影响。结果表明,SHK的TEMPO氧化速率高于SLK,但SLK-TEMPO氧化浆的羧基含量达到1.01 mmol/g,高于SHK-TEMPO氧化浆的羧基含量(0.89 mmol/g)。2种TOCN形态结构差异不大,均呈纤丝状结构,直径约为5～8 nm,长径比>100,且均保持纤维素I的晶型结构；SLK-TOCN的结晶度和悬浮液的透光度均略高于SHK-TOCN。2种TOCN膜均具有优良的光学性能和力学性能,SLK-TOCN膜的杨氏模量、拉伸强度及裂断伸长率分别为2.6 GPa、92 MPa和10.9%,均高于SHK-TOCN膜的2.4 GPa、90 MPa和8.7%。 |
| Abstract: |
| TEMPO-oxidation cellulose nanofibers (TOCNs) were prepared from unbleached kraft bamboo pulps (SHK, Kappa No.=25.5; SLK, Kappa No.=11.7) by means of TEMPO/NaBr/NaClO oxidation and subsequent homogenization. The TOCN films were prepared by vacuum filtration. During the TEMPO-oxidation processes, the properties of TEMPO oxidized pulps, TOCNs and TOCN films of SHK and SLK were compared, the effect of lignin on TEMPO-oxidation process and TOCN production was studied. Results showed that the TEMPO-oxidation rate of SHK was faster than SLK, but the carboxyl content of SLK-TEMPO oxidized pulp was 1.01 mmol/g, much higher than SHK-TEMPO oxidized pulp (0.89 mmol/g). The obtained TOCNs exhibited a fibril-like structure, with a narrow width ranging from 5 nm to 8 nm and a high aspect ratio (>100), and the TOCNs were cellulose-I. The suspension transparency and crystalline index of SLK-TOCN were higher than SHK-TOCN. The two kinds of TOCN films displayed good optical and mechanical performance, and the Yong’s modules, tensile strength, and the elongation of SLK-TOCN film were 2.6 GPa, 92 MPa, and 10.9%, respectively, all of them were higher than the SHK-TOCN film which were 2.4 GPa, 90 MPa, and 8.7%, respectively. |
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