FUEL
·
2025
·
IF 7.5
Yangyang Tang,Yuhang Li,Heping Yang,Xiaowei Bai,Xianxian Zhang,Shikun Li,Zhenghua Dai,Jian Li
This study presents a green high-temperature methanolysis strategy without exogenous hydrogen and catalysts, achieving efficient directional conversion of cellulose. Experimental results demonstrate complete cellulose conversion in the methanolysis system (360°C,1h), yielding liquid products dominated by α-methylglucoside (40.1 % selectivity) with minor esters, short-chain alcohols, and alkanes as byproducts, highlighting remarkable selectivity control. Comparative analysis with conventional pyrolysis reveals fundamental differences in product distribution and structural evolution mechanisms. Multidimensional characterization via gas chromatography-mass spectrometry (GC-MS) and comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GC × GC-TOF-MS) confirms 77.9 % selectivity toward sugar derivatives in methanolysis products, characterized by α-glycosidic bonds that starkly contrast with levoglucosan-dominated dehydrated structures in pyrolysis oils. Multiscale characterization of solid residues (Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy) further verifies that methanolysis selectively cleaves glycosidic bonds while preserving cellulose’s fibrous morphology and hydrogen-bonded network ordering, whereas pyrolysis residues exhibit disordered carbonized aggregates due to radical-mediated carbon skeleton reorganization. A kinetic model was established based on time-dependent cellulose conversion profiles. This work provides critical theoretical and technological foundations for the high-value, full-component utilization of cellulose resources.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Jinling Li,Shan Lu,Fei Liu,Qian Qiao,Haining Na,Jin Zhu
Development of an effective, nontoxic, and easy-to-process novel cellulose dissolution system for the preparation of regenerated cellulose fibers is of great importance and necessity for a greener and more sustainable future, with which the traditional viscose process with serious pollution can be gradually substituted. Herein, we demonstrated the successful utilization of a CO2 switchable solvent, a novel cellulose derivative dissolution system resembling viscose but without releasing toxic gases such as CS2 and H2S, for the preparation of regenerated cellulose fibers. The corncob cellulose raw material can be readily dissolved completely after the capture of CO2 in dimethyl sulfoxide (DMSO) with 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU), resulting in cellulose spinning dope with high stability. Results showed that regenerated cellulose fibers with smoother surface morphology, a higher degree of crystallinity, and satisfactory mechanical properties were obtained under mild conditions with relatively slower double diffusion. Moreover, drawing treatment further increased the degree of crystallinity and orientation and the mechanical properties. All fibers had a dense structure, circular cross sections, no fibrillation, and high thermal stability. The regenerated cellulose fibers had degrees of crystallinity and orientation and tensile strength of 75.3%, 0.82, and 1.05 cN/dtex and 68.4%, 0.82, and 1.00 cN/dtex, respectively, in water and 30 vol % DMSO coagulation baths with a drawing ratio of 2.0 and 1.5, respectively. This work illustrated that the CO2 switchable solvent, which could be considered as “green viscose”, is a good candidate with great potential for the preparation of regenerated cellulose fibers with high performance and various functionalities in the future.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
CELLULOSE
·
2014
·Vol. 21
·期 4
·2369-2378
·
IF 3.033
Xiao Peng,Zhang Jinming,Feng Ye,Wu Jin,He Jiasong,Zhang Jun
Using ionic liquid 1-allyl-3-methylimidazolium chloride as reaction medium, a series of novel cellulose esters containing phosphorus including cellulose diphenyl phosphate (C-Dp) and cellulose acetate (CA)–diphenyl phosphate mixed esters was synthesized homogeneously. The degree of substitution was well controlled by altering reaction conditions, such as the molar ratio of the acylating reagents/anhydroglucose unit and reaction time. The structure and thermal properties of cellulose esters were characterized by FTIR, NMR, wide-angle X-ray powder diffraction and differential scanning calorimetry. All the products possessed excellent solubility in some common organic solvents, and transparent films of cellulose esters were obtained by solution casting. In contrast to C-Dp, CA–diphenyl phosphate mixed esters showed clear glass transitions. More interestingly, these cellulose mixed esters exhibited thermoplastic behavior and could be processed by traditional melt processing methods.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Rui Yuan,Kai Wu,Qiang Fu
Direct ink writing, as a prospective three-dimensional (3D) printing technique, opens opportunities for offering high freedom to process cellulose into complex shapes. Current challenges are the accomplishment of dimensional accuracy of printed object and its truly 3D configuration, which put stringent requirements to the ink rheology that should be easily flowable under a suitable shear force while can rapidly recover to solid state after the force is removed. In this study, benefiting from the exquisite regulation of residual cellulose microfiber in a dissolved cellulose solution, a remarkable ink with excellent thixotropic property is prepared, which elaborately balance the traditional rheology tradeoff (extrudability and self-supporting) upon the formation of interconnected microfiber network. As a result, the optimized cellulose ink allows the printed object to successfully display arbitrary and truly 3D configurations, such as anatomical heart, ear, rabbit, lamp, and cup, and exhibit fine microstructure with a resolution of 250 μm.
研究领域:
材料科学
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生物材料
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Jiancong Kang,Chuanshuang Hu,Anthony Dichiara,Litao Guan,Hong Yun,Jin Gu
Hybridization of nanocellulose with zinc oxide nanoparticles can improve the dispersibility of the zinc oxide and bring new functions to the bio-based products. In this study, cellulose nanocrystal/zinc oxide (CNC/ZnO) nanohybrids with reinforcing and antibacterial properties were prepared via a facile one-pot route. Microcrystalline cellulose (MCC) was first treated with acidified zinc chloride and hydrolyzed into CNCs, which then served as a stabilizing and supporting agent for the in-situ growth of ZnO nanoparticles during subsequent chemical precipitation. The acidified ZnCl 2 solution played a dual role, acting both as cellulose hydrolytic media and as ZnO precursor. By adjusting the pH of the zinc precursor solution (pH = 9–12), well-dispersed rod-like (length: 137.0–468.0 nm, width: 54.1–154.1 nm) and flower-like (average diameter: 179.6 nm) ZnO nanoparticles with hexagonal wurtzite structure were obtained. CNC/ZnO nanohybrids were incorporated into waterborne polyurethane (WPU) films. The Young's modulus and tensile strength of the nanocomposite films increased gradually from 154.8 to 509.0 MPa and from 16.5 to 29.9 MPa, respectively, with increasing CNC/ZnO nanofiller content up to 10 wt%. The 10 % CNC/ZnO composites showed inhibition rates to both E. coli and S. aureus above 88.8 %.
研究领域:
材料科学
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纳米技术
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生物材料
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ran Liu,Yuanlong Guo,Min Pei,Yumei Chen,Lihua Zhang,Long Li,Qin Chen,Yaozhu Tian,Haibo Xie
Facile modification of cellulose or cellulosic derivatives is one of the important strategies to prepare materials with targeted properties, multifunctionality, thus extending their applications in various fields. Cellulose levulinate ester (CLE) has the structural advantage of acetyl propyl ketone moiety pendant, on which fully biobased cellulose levulinate ester derivatives (CLEDs) have been successfully designed and prepared via aldol condensation reaction of CLE with lignin-derived phenolic aldehydes catalyzed by DL-proline. The structure of CLEDs are featured by a phenolic α,β-unsaturated ketone structure, thus endowing them with good UV absorption properties, excellent antioxidant activity , fluorescence properties and satisfactory biocompatibility. The utility of this aldol reaction strategy, together with the facile tunable substitution degree of cellulose levulinate ester and the diversity of aldehydes, can provide potentially a large spectrum of structurally diverse functionalized cellulosic polymers and create new avenues to advanced polymeric architectures.
研究领域:
材料科学
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有机化学
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DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Zhao Rui,Dehai Yu,Fengshan Zhang
In this study, a novel cellulose nanocrystal/metal-organic framework composite (MC) was developed as a stabilizer for alkenyl succinic anhydride (ASA) Pickering emulsions, demonstrating remarkable sizing performance and antimicrobial properties for advanced food packaging applications. The MCs exhibited superior emulsion stabilization capabilities compared to pure metal-organic frameworks, with the optimum MC concentration identified as 1.0 wt% CNC. The hydrophobicity of the sizing paper was found to be enhanced with increasing CNC content. The MC-ASA sized paper demonstrated commendable storage stability, robust gas adsorption, and resistance to water vapor or water droplets. The MCs-ASA sized paper showed excellent food preservation efficacy, maintaining the freshness of strawberries for up to seven days, compared to ASA-sized paper without MCs. The antimicrobial assays targeting Escherichia coli and Staphylococcus aureus highlighted the intrinsic antimicrobial properties of the MCs, contributing to the extended freshness of the encased strawberries. The water vapor barrier efficacy and water retention capabilities of MCs-ASA sized paper were found to be superior to those of the paper without MCs, emphasizing the potential of the developed composite as an innovative and effective food packaging solution. This study offers valuable insights into the synthesis and implementation of CNC/MOF composite particles for versatile applications in food packaging, water-resistant materials, and environmental protection.
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高影响因子
Materials
·
2021
·Vol. 14
·期 19
·5851
·
IF 3.623
Cong Gao,Shuo Wang,Baojie Liu,Shuangquan Yao,Yi Dai,Long Zhou,Chengrong Qin,Pedram Fatehi
In this study, we incorporated 2,3-dialdehyde nanocrystalline cellulose (DANC) into chitosan as a reinforcing agent and manufactured biodegradable films with enhanced gas barrier properties. DANC generated via periodate oxidation of cellulose nanocrystal (CNC) was blended at various concentrations with chitosan, and bionanocomposite films were prepared via casting and characterized systematically. The results showed that DANC developed Schiff based bond with chitosan that improved its properties significantly. The addition of DANC dramatically improved the gas barrier performance of the composite film, with water vapor permeability (WVP) value decreasing from 62.94 g·mm·m−2·atm−1·day−1to 27.97 g·mm·m−2·atm−1·day−1and oxygen permeability (OP) value decreasing from 0.14 cm3·mm·m−2·day−1·atm−1to 0.026 cm3·mm·m−2·day−1·atm−1. Meanwhile, the maximum decomposition temperature (Tdmax) of the film increased from 286 °C to 354 °C, and the tensile strength of the film was increased from 23.60 MPa to 41.12 MPa when incorporating 25 wt.% of DANC. In addition, the chitosan/DANC (75/25, wt/wt) films exhibited superior thermal stability, gas barrier, and mechanical strength compared to the chitosan/CNC (75/25, wt/wt) film. These results confirm that the DANC and chitosan induced films with improved gas barrier, mechanical, and thermal properties for possible use in film packaging.
研究领域:
材料科学
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生物工程
·
食品包装
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 27
·11739-11745
·
IF 3.288
Xinfeng Wang,Xuelian Gou,Zhiguang Guo
More and more attention has been paid to the fabrication of superhydrophobic polymeric coatings recently, which have enormous potential in the field of waterproofing and self-cleaning applications. In this work, polyurea (PU) particles were firstly prepared through the condensation polymerization between isophorone isocyanate (IPDI) and water. By the combination of cellulose nanocrystals (CNC), polyurea@cellulose nanocrystal (PU@CNC) particles were successfully fabricated. After modification with 1H,1H,2H,2H-perfluorodecyltrichlorosilane (PFDTS), superhydrophobic PU@CNC particles were obtained. Then, after adding fluorocarbon lacquer, a superhydrophobic PU@CNC coated surface was fabricated with the assistance of a spraying method. The as-prepared PU@CNC coating exhibited best liquid repellency when the mass ratio of IPDI and CNC was approximately 1/10. Furthermore, favorable mechanical durability was confirmed by the abrasion test. The results showed that the water contact angles on the PU@CNC coated surface remained above 152° and sliding angles were less than 5° even after 200 abrasion cycles. All these results indicate that the coating is suitable for widespread practical applications.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2022
·
IF 11.533
Tan Li,Kai Miao,Zhigang Zhao,Yuqing Li,Huiyuan Wang,Atsushi Watanabe,Norio Teramae,Kaige Wang
The product distributions of cellulose pyrolysis under different pressures, temperatures, and atmospheres were investigated using a high-pressure micropyrolyzer to clarify the pyrolysis reaction mechanism of cellulose decomposition with hydrogen. EGA-MS results shows that the increase in hydrogen pressure prolonged the second stage of cellulose pyrolysis, which was dominated by decarboxylation. Pyrolysis products of cellulose under helium mainly included levoglucosan, furfural, and acids, while cellulose hydropyrolysis mainly produced C5-C7 ketones, besides small amount of alcohols, aromatics and aliphatic hydrocarbons, and even small amount of phenolics. Carbon yield of ketones was as high as 27.2% from cellulose hydropyrolysis under 2.5 MPa hydrogen and 500 °C. The yield of liquid products and non–condensable hydrocarbons increased with elevated hydrogen pressure. The formation mechanisms of aromatics, phenolics, aliphatic hydrocarbons, aldehydes, ketones, and alcohols under hydrogen atmosphere were discussed. Acetaldehyde was produced by acids through a HDO reaction. C5-C7 chain ketones and cyclic ketones were generated by furfural through HDO and hydrocracking reactions. The Diels–Alder reaction to generate aromatics was enhanced by increasing pyrolysis temperature under hydrogen atmosphere. The reaction network of cellulose hydropyrolysis was also proposed.
研究领域:
化学工程
·
能源科学
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Yang Chen,Chunjiang Xu,Jing Huang,Defeng Wu,Qiaolian Lv
Rheological behavior, including linear and nonlinear, as well as transient rheology of nanocrystalline cellulose (NCC) suspensions was studied in this work. Two kinds of polymer solutions, aqueous poly(vinyl alcohol) (PVA) with flexible chain structure and aqueous carboxymethyl cellulose (CMC) with semi-rigid chain structure, were used as the suspension media to further explore the role that the interactions among NCC and polymers played during shear flow. The results reveal that NCC has lower values of percolation threshold in the PVA solution than in the CMC one during small amplitude oscillatory shear (SAOS) flow because the flexible PVA chain has higher adsorbed level onto NCC particles than the negatively charged semi-rigid CMC chain, which is further confirmed by the Fourier transformed infrared (FT-IR) spectroscopy tests. As a result, the NCC suspension shows a weak strain overshoot in PVA solution during large amplitude oscillatory shear (LAOS) flow, which cannot be seen on the one in CMC solution. During startup shear flow, both of these two suspensions show evident stress overshoot behavior with the strain-scaling characteristics, indicating the formation of ordered long-term structure of rod-like NCC particles with self-similarity during flow. However, NCC suspension have far stronger stress overshoot response in CMC solution relative to the one in PVA solution. A possible synergy mechanism between NCC and CMC chain is hence proposed.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 15
·8695-8708
·
IF 4.21
Zhang Hui,Liu Yan,Cui Sisi,Zhou Yifa,Hu Junli,Ma Jiangang,Liu Yichun
Abstract Electrospun cellulose nanofibers are promising biomaterials but are suffering from the use of unfavorable organic solvents during the electrospinning process. In this manuscript, we used the periodate oxidation—adipic acid dihydrazide crosslinking strategy to fabricate electrospun cellulose nanofibers. Periodate oxidation of cellulose generated water soluble aldehyde cellulose, which thus allowed for the electrospinning in aqueous solution and avoided the use of unfavorable organic solvents. The following crosslinking with adipic acid dihydrazide made the nanofibers water resistant. The results show that the prepared cellulose nanofiber mats show moderate wet mechanical strength around 1 MPa, are able to absorb water equal to 30 times of their own weight, can degrade gradually by hydrolysis, and are cytocompatible. These cellulose nanofibers are expected to find applications in biomedical fields such as wound healing and tissue regeneration. Graphic abstract
研究领域:
材料科学
·
生物学
·
医学
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DOI
高影响因子
危险品化学品经营许可证（带存储）