One-Step Treatment for Upgrading Bleached Bamboo Pulp to Dissolving Pulp High Solvency in Green Alkali/Urea Aqueous Solution

Bleached bamboo pulp, as a kind of natural cellulose, has received significant attention in the field of biomass materials due to its advantages of environmental protection and the abundance of raw materials. Low-temperature alkali/urea aqueous system is a green dissolution technology for cellulose,...

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Veröffentlicht in:Polymers 2023-03, Vol.15 (6), p.1475
Hauptverfasser: Shang, Jiao-Ping, Liang, Pin, Peng, Yun, Xu, Ding-Feng, Li, Yi-Bao
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creator Shang, Jiao-Ping
Liang, Pin
Peng, Yun
Xu, Ding-Feng
Li, Yi-Bao
description Bleached bamboo pulp, as a kind of natural cellulose, has received significant attention in the field of biomass materials due to its advantages of environmental protection and the abundance of raw materials. Low-temperature alkali/urea aqueous system is a green dissolution technology for cellulose, which has promising application prospects in the field of regenerated cellulose materials. However, bleached bamboo pulp, with high viscosity average molecular weight ( η) and high crystallinity, is difficult to dissolve in an alkaline urea solvent system, restraining its practical application in the textile field. Herein, based on commercial bleached bamboo pulp with high η, a series of dissolvable bamboo pulps with suitable η was prepared using a method of adjusting the ratio of sodium hydroxide and hydrogen peroxide in the pulping process. Due to the hydroxyl radicals being able to react with hydroxyls of cellulose, molecular chains are cut down. Moreover, several regenerated cellulose hydrogels and films were fabricated in an ethanol coagulation bath or a citric acid coagulation bath, and the relationship between the properties of the regenerated materials and the η of the bamboo cellulose was systematically studied. The results showed that hydrogel/film had good mechanical properties, as the η is 8.3 × 10 and the tensile strength of a regenerated film and the film have values up to 101 MPa and 3.19 MPa, respectively. In this contribution, a simple method of a one-step oxidation of hydroxyl radicals to prepare bamboo cellulose with diversified η is presented, providing an avenue for a preparation of dissolving pulp with different η in an alkali/urea dissolution system and expanding the practical applications of bamboo pulp in biomass-based materials, textiles, and biomedical materials.
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Low-temperature alkali/urea aqueous system is a green dissolution technology for cellulose, which has promising application prospects in the field of regenerated cellulose materials. However, bleached bamboo pulp, with high viscosity average molecular weight ( η) and high crystallinity, is difficult to dissolve in an alkaline urea solvent system, restraining its practical application in the textile field. Herein, based on commercial bleached bamboo pulp with high η, a series of dissolvable bamboo pulps with suitable η was prepared using a method of adjusting the ratio of sodium hydroxide and hydrogen peroxide in the pulping process. Due to the hydroxyl radicals being able to react with hydroxyls of cellulose, molecular chains are cut down. Moreover, several regenerated cellulose hydrogels and films were fabricated in an ethanol coagulation bath or a citric acid coagulation bath, and the relationship between the properties of the regenerated materials and the η of the bamboo cellulose was systematically studied. The results showed that hydrogel/film had good mechanical properties, as the η is 8.3 × 10 and the tensile strength of a regenerated film and the film have values up to 101 MPa and 3.19 MPa, respectively. In this contribution, a simple method of a one-step oxidation of hydroxyl radicals to prepare bamboo cellulose with diversified η is presented, providing an avenue for a preparation of dissolving pulp with different η in an alkali/urea dissolution system and expanding the practical applications of bamboo pulp in biomass-based materials, textiles, and biomedical materials.</abstract><cop>Switzerland</cop><pub>MDPI AG</pub><pmid>36987256</pmid><doi>10.3390/polym15061475</doi><orcidid>https://orcid.org/0000-0003-0505-6612</orcidid><oa>free_for_read</oa></addata></record>
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subjects Aqueous solutions
Bamboo
Biomass
Biomedical materials
Bleaching
Cellulose
Citric acid
Coagulation
Dissolution
Energy consumption
Environmental protection
Ethanol
Hydrogels
Hydrogen peroxide
Hydroxides
Hydroxyl radicals
Lithium
Low temperature
Mechanical properties
Molecular chains
Molecular weight
Oxidation
Pulping
Raw materials
Sodium hydroxide
Solvents
Technology application
Tensile strength
Textiles
Ureas
Viscosity
title One-Step Treatment for Upgrading Bleached Bamboo Pulp to Dissolving Pulp High Solvency in Green Alkali/Urea Aqueous Solution
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