Recycled fiber treated with NaOH/urea aqueous solution: effects on physical properties of paper sheets and on hornification
Source abstract
Abstract
Abstract Hydrogen bonding among fiber microfibrils is the primary cause of fiber hornification, wherein NaOH/urea aqueous solution precooled to −13 °C can disassemble inter- and intramolecular hydrogen bonds. Whether hornified fibers treated with this process can significantly improve fiber swelling ability and physical properties of the resulting paper sheets remains a problem. In this investigation, the 6th cycle fiber was pretreated with this procedure, and the water retention value of the fiber before and after treatment and the physical properties of the resulting paper sheets were studied. The results indicate that the lignin decline, complete swelling of flat fiber, filling of cellulose film between the interfiber network, and decreasing crystalline region all contribute to the increase in water retention value. The water retention value of repaired fiber is equivalent to that of virgin pulp, and hornification reverses by 89 %. In addition, the cellulose film filling among the fiber network constructs a similar reinforced concrete structure, which causes the tear, burst, and tensile index of the resulting paper sheets to increase by 145 %, 98 %, and 43 %, respectively.
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Research context
OpenAlex topics: Advanced Cellulose Research Studies · Material Properties and Processing · Natural Fiber Reinforced Composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Faculty of Environmental Science and Engineering and Faculty of Chemical Engineering , Kunming University of Science and Technology , 650500 Kunming , China
School of Chemistry and Materials Engineering , Liupanshui Normal University , 553004 Liupanshui , China
Faculty of Chemical Engineering , Kunming University of Science and Technology , 650500 Kunming , China
Limerick Pulp and Paper Research Centre , University of New Brunswick , E3B 5A3 Fredericton , Canada
Funding
National Natural Science Foundation of China · Guizhou Science and Technology Department
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