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| Preparation of Cellulose Nanofibrils by Ultra-low Acid Hydrolysis |
| Received:October 06, 2019 |
| DOI：10.11980/j.issn.0254-508X.2020.01.003 |
| Key Words:cellulose nanofibrils ultra-low acid hydrolysis fiber properties yield Malvern granularity |
| Fund Project:国家重点研发计划
2016YFE0125800
;
国家自然科学基金
31500492
;
浙江省自然科学基金
LY16C160005
国家重点研发计划（2016YFE0125800）；国家自然科学基金（31500492）；浙江省自然科学基金（LY16C160005）。 |
| Author Name | Affiliation | | MA Haizhu | College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018 | | ZHOU Tianwen | College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018 | | XUE Guoxin | College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018 | | WANG Jiajun | College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018 | | GUO Daliang | College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018
School of Environmental and Natural Resource, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 |
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| Abstract:In this paper，the effect of ultra-low acid hydrolysis pretreatment on the properties of cellulose nanofibril （CNF）prepared by mechanical ballmilling was studied using bleached hardwood pulp as raw material.By varying hydrolysis temperature and time，and the following ball milling time，the yield of CNF was determined. SEM，XRD，TG and nanoparticle size analyzer were used for characterization of the surface morphology，crystallinity,thermal stability and particle size changes of CNF. With the increase of hydrolysis temperature from 100℃ to 140℃, the yield of ball milled CNF decreased by 37.6 percent age points, the PDI value of CNF gradually decreased, and the medium and long fibers of CNF gradually decreased. When the hydrolysis temperature reached 140℃, the length of CNF was about 100 nm and had uniform distribution,while the crystallinity of CNF fibers increased first and then decreased slightly with the increase of hydrolysis temperature.With the increase of the hydrolysis time from 1 h to 3 h, the yield of CNF prepared by ball milling time decreased from 62.8% to 49.8%. The PDI and crystallinity values of CNF both increased first and then decreased. When the ball milling time reached 3 h, the diameter of CNF was about 100 nm.With the increase of ball milling time from 8 h to 24 h, the diameter of all of CNF prepared reached 100 nm, the PDI value of the Malvern particle size of CNF kept increasing and the uniformity of CNF particles decreased continuously. The thermal stability of CNF was improved after ball milling for 16 h. |
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