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| 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 |
| Key Words:unbleached kraft bamboo pulp; TEMPO oxidation; nanocellulose; films; strength |
| Fund Project: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)。 |
| Author Name | Affiliation | | 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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| 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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