CELLULOSE
·
2026
·
IF 4.6
Wang Chen,Li Jiaojiao,Zhao Bingyu,Yu Yuxiu,Song Yan,Liu Yaodong
Concentrated cellulose solutions undergo solution-gel transition at low temperatures, which results in higher strength and modulus of fibers prepared in low-temperature coagulation bath. Based on this hypothesis, a series of regenerated cellulose fibers using methanol coagulation bath at different temperatures were prepared and compared with commonly used water coagulation bath. The results showed that the strength and modulus of all fibers spun in methanol coagulation baths were higher than those spun in water coagulation baths. The fibers prepared at − 60 °C exhibited the highest strength and modulus of 426 MPa and 31.74 GPa, respectively. In order to reveal the impact of the composition and temperature of the coagulation bath on the fibers, the solvent in/out-diffusion in the fibers during the coagulation was quantified. At temperatures as low as − 60 °C, LiCl exhibited minimal diffusion. Furthermore, the diffusion of non-solvent methanol declined as temperature decreased. At last, the process was validated with high molecular weight straw cellulose. High-performance regenerated cellulose fibers with strength of 664 MPa and modulus of 41.26 GPa were successfully prepared.
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DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 7
·702
·
IF 2.935
Mu-Tan Luo,Hai-Long Li,Chao Huang,Hai-Rong Zhang,Lian Xiong,Xue-Fang Chen,Xin-De Chen
Cellulose-based superabsorbent was synthesized by bacterial cellulose (BC) grafting acrylic acid (AA) in the presence ofN,N′-methylenebisacrylamide (NMBA) as a crosslinker and ammonium persulfate (APS) as an initiator. The influence of different factors on composite synthesis, including the weight ratio of the monomer to BC, initiator content, crosslinker content, AA neutralization degree, reaction temperature, and reaction time on the water absorbency of the composite, were systematically learned. Under the optimized conditions, the maximum water absorbency of the composite was 322 ± 23 g/g distilled water. However, the water absorbency was much less for the different salt solutions and the absorption capacity of the composite decreased as the concentration of the salt solutions increased. The pH value had a significant influence on water absorption performance, and with the increase of temperature, the water retention rate of the composite decreased. Additionally, the structure of this composite was characterized with nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The results of NMR and FT-IR provided evidence that the composite was synthesized by BC and AA, and the microstructure showed that it had good performance for water absorption. In addition, the composite possessed suitable thermal stability, and that it could be used in a few high-temperature environments. Overall, this composite is promising for application in water absorption.Keywords:bacterial cellulose;superabsorbent;polymerization;function and structure
研究领域:
材料科学
·
高分子化学
·
环境科学
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Fan Su,Dagang Liu,Minyu Li,Qin Li,Chang Liu,Lin Liu,Jie He,Huanhuan Qiao
Cellulose nanocrystals (CNCs) per their twisting structure and high aspect ratio and charged surface property are increasingly receiving great attention in chiral photonic crystal and pigment fabrication. However, the cholesteric mesophases of CNCs is unstable and easily destroyed by the additives with high M w . In this work, hydroxypropyl cellulose (HPC) and carboxymethyl cellulose (CMC) are incorporated into CNCs for a continuous mesophase transition monitoring. We investigated the effects of HPC and CMC on the properties of CNCs with respect to the morphology, mesophase, rheology, and structure-color properties. Our results showed that the addition of CMC (≥ 1 wt%) prevented the formation of a continuous cholesteric phase but resulting in a fast gelation due to the strong repulsion between CMC and CNCs. Alternatively, the cholesteric phase was well-preserved in the CNC/HPC in which HPC (< 10 wt%) served as an efficient tuner of phase transition, color hue and rheology properties.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 12
·7053-7064
·
IF 3.809
Pang Zhiqiang,Wang Peiyu,Dong Cuihua
Abstract Currently, cellulose nanocrystals (CNCs) are primarily prepared with acid-catalyzed hydrolysis process using strong mineral acid. However, it suffers from low yield and high dosage of acid. For high yield and low dosage of acid, we prepare CNCs by two steps method. Firstly, the cellulose was ultrasonically pretreated in ionic liquid (IL) at mild conditions. Secondly, the samples were hydrolyzed by H 2 SO 4 with concentration of 20–23%. The results showed that during ultrasonic pretreatment at mild conditions, accessibility and susceptibility of the amorphous region in cellulose was substantially enhanced upon cooperative action of ultrasonication and ILs. Meanwhile, the crystalline region of cellulose was retaining untouched, and further results in the fact that enhanced reactivity of the amorphous region enabled acid-catalyzed hydrolysis to proceed smoothly. Experimental results show that the extracted CNCs exhibited rod-like shape with dimension of 220–300 nm in length and 15–22 nm in width. It’s also shown that thermostability of CNCs was greatly enhanced compared to that prepared by the traditional process. Ultrasonic pretreatment of cellulose in ILs offered a promising and efficient system for CNCs preparation with high yield, crystallinity and low dosage of acid. Graphical abstract
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Shasha Li,Liangzhi Qiao,Chao Liang,Liangshen Zhao,Kaifeng Du
High strength and excellent selectivity are two important aspects of porous cellulose microspheres as adsorbents for protein separation. For this purpose, self-reinforced all-cellulose microspheres (SCMs) with high strength were fabricated using natural cellulose nanofibers (CNFs) as fillers and then immobilized via 3-aminophenylboronic acids as affinity ligands for selective enrichment of glycoproteins . In particular, the inherent stiffness of entrapped CNFs endowed SCMs with more inflexibility, because the stress can be efficiently transferred from the network of SCMs to the stiff CNFs during the separation process. Besides, SCMs, as an all-cellulose material with homogenous surface chemistry and pore structure characteristics, are more suitable as supports for adsorbents. Finally, the SCMs were immobilized with 3-aminophenylboronic acids (BA/EPI-SCMs) and tested their performance in affinity adsorption of glycoproteins. BA/EPI-SCMs showed fast separation, high adsorption amount, and excellent selectivity toward glycoproteins.
研究领域:
材料科学
·
生物技术
·
化学工程
·
分析化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Shaojie Zhang,Chao Yu,Na Liu,Yun Teng,Cuiyu Yin
In this study, cellulose pulp and urea were used to synthesize cellulose carbamate (nitrogen content reaches 4.5%) by low-cost and environmentally friendly solid-liquid phase method. Cellulose carbamate fluid was prepared by using sodium hydroxide aqueous solution as solvent. The fluid was regenerated and formed in a coagulation bath , and finally a regenerated cellulose membrane with high transparency and separation ability was obtained. The simple chemical treatment of cellulose not only greatly increased the mass fraction of cellulose dissolution (It has reached 15%) and retains the original crystal form and thermal stability of cellulose. The surface of the membrane was relatively dense, and the inside has regular microchannel . The factors affect the transparency and water flux of regenerated cellulose membranes were discussed by orthogonal experimental range analysis. The ability of the regenerated cellulose membrane to reject dyes was tested. The results showed that the rejection of methyl blue and congo red reached 100%, and the rejection rate of methyl orange reached 60%. The oil/water separation ability and the anti-pollution ability of the regenerated cellulose membrane were tested. The oil/water separation effect reached 100%. This membrane may have application prospect in water treatment, biotechnology.
研究领域:
材料科学
·
环境工程
·
膜技术
·
高分子化学
·
水处理
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Jinhang Yang,Zijun Zhang,Hengbang Zhang,Ruipeng Xue,Guofan Xu,Haining Na,Jin Zhu
A rapid bottom-up fabrication strategy was developed to construct micrometer-scale 2D cellulose nanosheets (CNSs) driven by microwave-activated surface hydroxyl groups of 1D cellulose nanocrystals (CNCs). • The synergistic dipole-hydrogen bond nano-welding mechanism and the law governing reversible structural transformation were elucidated. • Compared with rod-like CNCs, reconstructed lamellar rCNCs greatly improve the gas barrier and mechanical properties of biodegradable PBAT composites. Since the discovery of cellulose nanosheets (CNSs), these two-dimensional (2D) nano-sized cellulose nanomaterials have demonstrated advantages in many applications such as barrier materials, reinforcing materials, and film materials, owing to their large lateral dimensions, thin sheet thickness, and continuous sheet-like structure. Although there is a certain structural correlation between CNSs and cellulose nanocrystals (CNCs), it still remains unclear whether CNCs can be directly assembled to obtain CNSs. Therefore, a nano-welding strategy based on microwave hydroxyl activation is proposed in this work, which realizes the reconstruction of 1D CNCs into 2D reconstructed CNSs (rCNSs) within a short reaction time of 15 min. The obtained 2D rCNSs possess sizes of several micrometers and possess structural origins and crystalline building units similar to those of naturally extracted CNSs. The results reveal that microwave treatment effectively activates the surface hydroxyl groups of CNCs, facilitates charge separation of hydroxyl groups, and increases interfacial dipole moment. Ordered hydrogen bond networks are induced via dipole interactions to further trigger the nano-welding, accomplishing the ordered reconstruction of 2D sheet structures. The O 2 and CO 2 barrier properties of the reconstructed lamellar rCNCs are 1.67 times and 1.12 times those of rod-like CNCs in the PBAT matrix, respectively. This work provides important theoretical support and technical routes for the controllable fabrication and functional application of high-performance 2D nanocellulose materials.
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DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-13
·
IF 23.2
Lin Yan,Huang Chen,Huang Caoxing,Deng Yongjun,Zou Xiuxiu,Ma Wencan,Fang Guigan,Ragauskas Arthur J.
Lignin has gained extensive attention as an ideal carbon precursor due to its abundance and high carbon content. However, the agglomeration of lignin and additional corrosive and unrecyclable reagents in direct pyrolysis still limit the development of lignin-based porous carbons. Herein, a facile and eco-friendly strategy was proposed to fabricate hierarchical porous lignin/cellulose-based carbon materials (LCs). In the process, cellulose nanofibrils acted as the skeleton of the bio-aerogels, which supported lignin and benefit the preparation of the LCs. Moreover, the specific surface area and the graphitization degree of LCs can be regulated by varying the cellulose content. Without activation, the bio-based carbon material (LC30) had a high specific surface area of 1770 m 2 g −1 , which displayed high specific capacitance of 216.2 F g −1 at the current density of 0.5 A g −1 . The supercapacitor based on LC30 also showed outstanding energy density of 12.3 Wh kg −1 at the power density of 50 W kg −1 . The sustainable raw material, simple and harmless preparation process, and remarkable electrochemical performance enable LC30, a promising supercapacitor electrode for energy storage.
研究领域:
材料科学
·
能量存储
·
纳米技术
·
高分子科学
·
电化学
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DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Zeming Jiang,Lan Tang,Xin Gao,Wentao Zhang,Jiwei Ma,Liping Zhang
An electrolyte and aprotic solvent mixture were used to prepare cellulose solutions containing cellulose nanocrystals (CNCs). All-cellulose composite fibers were then produced by dry–wet spinning these solutions. The presence of CNC in the all-cellulose fibers was demonstrated, and the effects of the CNC on the fiber properties were investigated. The all-cellulose fibers were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and electronic tensile measurements. These results showed that CNCs were present in the mixture and that their structure was maintained in the all-cellulose fibers. No compatibility problems between the CNC and cellulose II matrix were observed. Introducing CNC enhanced the crystallinity, thermal stability, and mechanical properties of the composite fibers.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 96
·93428-93435
·
IF 3.289
Xiao Wei,Wei Wei,Yu-hu Cui,Ting-ju Lu,Man Jiang,Zuo-wan Zhou,Yong Wang
All-cellulose composites (ACCs) materials exhibit excellent mechanical properties and attract much attention of researchers. In this work, raw straw cellulose fiber (R-SCF), alkali-treated SCF (N-SCF) and activated SCF (A-SCF) were used to prepare the ACCs, respectively. The results demonstrated that although the three SCFs exhibited similar crystalline structures, i.e. cellulose I, they exhibited different surface morphologies. Morphological characterization about the cryogenically fractured surfaces and the tensile-fractured surfaces of the ACCs, which were prepared through mixing SCF into the microcrystalline cellulose (MCC) solution and then precipitated, clearly demonstrated that the ACCs were a material with a multiphase structure. The mechanical properties of the ACCs were greatly dependent upon the interfacial adhesion between the SCF and the regenerated MCC (RMCC). Ultra-high tensile strength (650.2 MPa) was achieved for the ACCs containing the A-SCF, which was the highest tensile strength reported in the literatures for the isotropic ACCs. The reinforcement mechanism was then analyzed. This work provides new insight on preparing the ACCs with ultrahigh mechanical properties.
研究领域:
材料科学
·
生物质材料
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yu Shu,Qiuhong Bai,Guangxu Fu,Qiancheng Xiong,Cong Li,Huafeng Ding,Yehua Shen,Hiroshi Uyama
This study reports excellent supercapacitor performance of hierarchical composite porous carbon (HPC) materials successfully fabricated by one-step carbonization and activation process derived from polysaccharides carboxymethyl cellulose, bacterial cellulose, and citric acid. The resultant HPC displayed unique porous nanosheet morphology with high specific surface area (2490 m 2 g −1 ) and rich oxygen content (7.3%). The developed structures with macropores, mesopore walls, micropores, and high oxygen content led to excellent electrochemical performance for electrode of electric double-layer capacitors (EDLCs). In a three-electrode system, the HPC electrode showed a high specific capacitance of 350 F g −1 , good rate performance, and excellent cycling stability. The energy density of supercapacitor based on HPC was comparable to or higher than that of commercially supercapacitors. More importantly, two series-wound devices were easy to light light-emitting diode (LED, 3.0 V). These results suggest that the current material is a promising candidate for low-cost and eco-friendly energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Si Wang,Xiao Wang,Wei Liu,Liguo Zhang,Hao Ouyang,Qingxi Hou,Kejing Fan,Jinsong Li,Pengtao Liu,Xinliang Liu
It is important to make full utilization of industrial biomass residues. Pulp was prepared from licorice residues by soda-anthraquinone pulping followed by peroxyacetic acid bleaching. Cellulose nanofibril was obtained by enzymatic pretreatment followed by homogenization of the pulp (ETCNF). The effects of enzymatic pretreatment on ETCNF were investigated. Chitosan nanofibril (CHN) and lignin nanoparticles (LNPs) were prepared and used for ETCNF composites, respectively. The results showed that ETCNF exhibited clear nanofibrillar structure and a highly relative colloidal stability, and a much higher crystallinity index and thermal stability compared to TEMPO-medicated oxidized one; the cellulose composite films incorporated with CHN or LNPs exhibited good thermal stability and hydrophobicity. Compared with ETCNF film, ETCNF@LNPs-5.0% film showed higher UV-blocking ability and thermal stability, but reduced light transmittance, while ETCNF@CHN-5.0% film showed improved mechanical properties and similar light transmittance. This study would expend licorice residues as potential materials for CNF and its applications.
研究领域:
材料科学
·
生物技术
·
环境科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）