Fiber Evolution during Alkaline Treatment and Its Impact on Handsheet Properties

Yun, Jimmy; Peng, Yangyang; Strand, Anders; Fu, Shiyu; Sundberg, Anna; Retulainen, Elias

doi:10.15376/biores.13.4.7310-7324

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…5 a illustrates the handsheets' thickness. The thickness of the handsheet composed of BULF with basis weights of 70 g/m 2 and 80 g/m 2 exhibited a marginal increase compared to the handsheet by HWKP due to fiber swelling [ 56 ]. But a handsheet composed by ULF showed the highest thickness than others as the fibers were stiff due to the presence of lignin and other substances.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of handsheet using cellulose based Agri-weed: A sustainable utilization of Urena Lobata fiber

Rahman,

Hasan,

Repon

et al. 2024

Heliyon

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Section: Resultsmentioning

confidence: 99%

Preparation and characterization of handsheet using cellulose based Agri-weed: A sustainable utilization of Urena Lobata fiber

Rahman,

Hasan,

Repon

et al. 2024

Heliyon

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“…The shift can occur especially at higher NaOH concentrations, which are more than 9 %. The amorphous region displacement transformation was only seen at 12 % NaOH concentration, and this indicates that the higher the concentration of NaOH, the more dominant the amorphous structure [13]. Sodium hydroxide (NaOH) is a solid alkali in a crystalline solid, also known as caustic soda.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Nanomaterials Based on Waste Paper with Variations in Heating Temperature and NaOH Concentration

et al. 2022

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Cementitious materials have been attempted to achieve more environmentally friendly construction materials. Nanomaterials with smaller particle sizes than cement can enhance the hydration gel structure. This report presents the processing of prepared waste paper into nanomaterials as raw materials available in abundant resources and supports the waste recycling process. Materials were processed by alkaline treatment using 5, 10 and 15 % NaOH solutions and 2 % NaClO at heating temperatures of 100, 125 and 150 °C. Testing the characteristics of the materials aims to determine the effect of heating temperature and concentration of NaOH used in the processing of nanomaterials. Based on the XRD test results, the use of lower temperatures showed that the amorphous phase, which is the main factor in the level of reactivity of the materials, tends to increase with increasing NaOH concentration. SEM morphology analysis showed that lower heating temperature was more effective in removing lignin content after alkaline treatment. The lignin content that can cause weathering needs to be removed and achieve maximum effect in bleaching nanomaterials based on waste paper. The particle size distribution results of nanomaterials were obtained with a size of 255-513 nm. Nanomaterials prepared from recycled materials are attracting interest as a new binder in nanocomposites. HIGHLIGHTS Nanomaterials with smaller particle sizes than cement can enhance the hydration gel structure The use of lower temperatures showed that the amorphous phase, which is the main factor in the level of reactivity of the materials, tends to increase with increasing NaOH concentration The lower heating temperature was more effective in removing lignin content after alkaline treatment Nanomaterials prepared from recycled materials are attracting interest as a new binder in nanocomposites GRAPHICAL ABSTRACT

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Refinability of mercerized softwood kraft pulp

Koistinen,

Wang,

Hiltunen

et al. 2024

Cellulose

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In this study, the impact of mercerization and PFI refining on the properties of softwood kraft pulp was investigated. Never-dried softwood kraft pulp was treated with 15 wt% NaOH to generate highly hydrated fibers, followed by PFI refining to increase pulp fibrillation and porosity. The original and modified pulp properties were assessed for morphological and chemical composition. Differential scanning calorimetry (DSC) tests and water retention value (WRV) measurements were conducted to evaluate pulp swelling behavior and porosity. Fiber bonding potential and strength properties were evaluated from handsheets of mercerized and unmercerized pulp. Mercerization with 15 wt% NaOH successfully converted cellulose I to cellulose II, leading to slightly increased pulp swelling and micropore volume. However, the mercerization reduced handsheet strength properties. Furthermore, PFI refining resulted in a negligible enhancement of bonding in mercerized pulp, in stark contrast to its significant effect on unmercerized kraft pulp.

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Fiber Evolution during Alkaline Treatment and Its Impact on Handsheet Properties

Cited by 5 publications

References 13 publications

Preparation and characterization of handsheet using cellulose based Agri-weed: A sustainable utilization of Urena Lobata fiber

Preparation and characterization of handsheet using cellulose based Agri-weed: A sustainable utilization of Urena Lobata fiber

Characteristics of Nanomaterials Based on Waste Paper with Variations in Heating Temperature and NaOH Concentration

Refinability of mercerized softwood kraft pulp

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