Analyzing TEMPO-Oxidized Cellulose Fiber Morphology: New Insights into Optimization of the Oxidation Process and Nanocellulose Dispersion Quality,ACS Sustainable Chemistry & Engineering

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Analyzing TEMPO-Oxidized Cellulose Fiber Morphology: New Insights into Optimization of the Oxidation Process and Nanocellulose Dispersion Quality
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-11-24 , DOI: 10.1021/acssuschemeng.0c05989
Jaka Levanič _{1,

2} , Vladimira Petrovič Šenk ₁ , Peter Nadrah ₃ , Ida Poljanšek ₁ , Primož Oven ₁ , Antti Haapala ₂

Affiliation

High-definition automated optical analysis was used to observe the morphological changes of bleached hardwood dissolving pulp during oxidation mediated by (2,2,6,6-tetramethylpiperidn-1-yl)oxyl (TEMPO). The effects of TEMPO treatment kinetics on fiber morphology and fibrillation degree at a constant reagent loading were studied. The pulp underwent significant swelling, and carboxyl groups were introduced in which the fiber cell walls loosened, which contributed to fibrillation and subsequently nanocellulose dispersion quality in terms of both viscosity and visible light transmittance. The use of an automated optical fiber analyzer facilitates process control, as it allows controlling the fiber morphology and preventing major losses in the form of pulp fines stemming from an unnecessarily long TEMPO oxidation time.

中文翻译：

分析TEMPO氧化纤维素纤维的形态：氧化工艺和纳米纤维素分散质量优化的新见解

使用高清自动光学分析法观察由（2,2,6,6-四甲基哌啶-1-基）氧基（TEMPO）介导的漂白硬木溶解浆在氧化过程中的形态变化。研究了在恒定试剂负载下TEMPO处理动力学对纤维形态和原纤化程度的影响。纸浆经历了显着的溶胀，并且引入了羧基，其中纤维细胞壁松弛，这从粘度和可见光透射率两个方面有助于原纤化并随后促进了纳米纤维素分散质量。使用自动光纤分析仪有助于控制过程，因为它可以控制纤维的形态并防止由于不必要的TEMPO氧化时间过长而造成的纸浆细粉形式的重大损失。

更新日期：2020-12-07

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