GREEN CHEMISTRY
·
2019
·Vol. 21
·期 10
·2759-2770
·
IF 9.405
Chuanwei Lu,Chunpeng Wang,Juan Yu,Jifu Wang,Fuxiang Chu
Photoinduced metal-free “grafting from” atom transfer radical polymerization (ATRP) has been successfully applied to the fabrication of renewable cellulose graft copolymers with the aid of 2-bromo-2-phenylacetyl ester-modified ethyl cellulose as the macroinitiator. In the presence of an organic-based photoredox catalyst, “grafting from” polymerization of lauryl methacrylate from ethyl cellulose was efficiently activated and deactivated with UV irradiation, resulting in good control over molecular weight. 1H NMR and MALDI-TOF MS confirmed highly preserved Br chain-end functionality. Furthermore, cellulose graft copolymers with a block side chain architecture were successfully prepared through chain extension by metal-free “grafting from” ATRP. We believe that this work will provide a novel approach to design well-defined cellulose graft copolymers and further expand their application fields.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 13
·7717-7725
·
IF 3.917
Tao Peng,Wu Zhengmei,Xing Chuyue,Zhang Qi,Wei Zuyun,Nie Shuangxi
In this work, bagasse pulp was used to prepare cellulose nanofibrils (CNFs) by enzymatic assisted mechanical treatment. A xylanase pretreatment was applied for varying the hemicellulose content in the pulp fibers, and the contribution of this pretreatment to the post-mechanical treatment was investigated. The results showed that CNFs prepared after xylanase pretreatment exhibited enhanced thermal stability with an increase in crystallinity. However, the overall thermal stability of the CNFs decreased significantly after xylanase was applied directly to the mechanical treated CNFs. The results indicate that the presence of hemicellulose in the fiber could affect the thermal stability of CNFs. The direct application of xylanase to CNFs could affect both the hydrogen bond between the hemicellulose and the cellulose and the covalent bond between the hemicellulose molecules, which partially destroys the internal network structure and reduces of thermal stability of CNFs. Graphic abstract
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高影响因子
Journal of Renewable Materials
·
2019
·Vol. 7
·期 12
·1363-1380
·
IF 1.427
Wang Xu,Zhou Jianhong,Pang Bo,Zhao Dawei
Introduction of the strategy of anhydrous calcium carbonate protection incorporated with the drop by drop reaction, high-purity 1-butyl-3-methylimidazolium chloride ([Bmim] Cl) was prepared at reaction temperature of 80°C for only 10 h. Cellulose samples from different biomass sources
(with different degree of polymerization characteristic) could be rapidly (no more than 10 minutes) and completely dissolved in the [Bmim] Cl using a microwave-assisted ionothermal route. Homogeneous cellulosic regenerates with high degree of polymerization and thermal stability characteristics
were obtained through a coagulation process in water. Furthermore, the dissolved celluloses were readily regenerated into solid products such as casting films and spinning fibers, which exhibited high transparency and flexibility, as well as superior mechanical properties of over 300 MPa (tensile
strength) more than those of cellulose samples reported. This study therefore provides a new process for the synthesis of high-purity [Bmim] Cl for the highly efficient dissolution of cellulose to produce high performance cellulosic materials for various applications such as flexible electronic,
optoelectronic, soft robots.
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高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 18
·6402-6411
·
IF 0
Liangbo Yu,Jinyou Lin,Feng Tian,Xiuhong Li,Fenggang Bian,Jie Wang
Cellulose nanofibrils (CNF), as a kind of renewable, sustainable and biodegradable natural-based nanomaterial, have shown great potential application in numerous fields due to their fascinating properties. Some properties of CNF-based materials are closely related to their cellulose polymorph and crystallinity index. In this work, we present a facile method for the generation of CNF with tunable polymorphs and crystallinity via the alkali treatment of jute fibers under various conditions followed by (TEMPO)-mediated oxidation and mechanical disintegration. The changes of the cellulose polymorphs and crystallinity induced by alkali treatment on the jute fibers and consequently obtained CNF were well investigated by synchrotron radiation wide-angle X-ray scattering (SR-WAXS), Fourier transform infrared spectra (FTIR) and differential scanning calorimetry (DSC), respectively. Moreover, the morphology of the as-prepared CNF was also examined by transmission electron microscopy (TEM). It has been found that the CNF showed an identical cellulose polymorph to their source material, but a much higher crystallinity index, which revealed the feasibility of CNF generated from jute fibers with tunable polymorphs and crystallinity indexes.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xiaoyu Wang,Yanjun Tang,Xianmei Zhu,Yiming Zhou,Xinghua Hong
Polylactic acid (PLA) serves as an ideal matrix for preparing electrically conductive materials for electrode, electromagnetic shielding and functional biological material application. Here, an environmentally friendly PLA/polyaniline (PANI)/nanocrystalline cellulose (NCC) nanocomposite film was prepared. Effects of NCC loadings on the rheological behavior of PLA/PANI/NCC suspensions and the microscopic, thermal, mechanical and conductive properties of nanocomposite films were investigated. Results revealed that PLA was wrapped with PANI particles and NCC was uniformly distributed in the obtained nanocomposite films. The PLA/PANI/NCC films exhibited an electrical conductivity of up to 2.16 S∙m −1 with 1% NCC dosage. Besides, the viscosity and viscoelasticity of the PLA/PANI/NCC suspensions were decreased and the dispersion stability of the suspensions was improved with the incorporation of NCC. Furthermore, the mechanical strength of PLA/PANI/NCC nanocomposite films was significantly improved with the reinforcement effect of NCC. In presence of 4% NCC loading, the tensile strength (TS) and tensile modulus (TM) of PLA/PANI/NCC films had an increase of 38.1% and 89.1%, respectively, while the elongation at break (Eb) exhibited a decrease of 27.3%, as compared to that of PLA/PANI films. These results demonstrated that the as-prepared PLA/PANI/NCC nanocomposite film may have the potential to be used as a bio-based electrically conductive material.
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高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Yufan Yang,Shanying Sui,Yufang Lu,Jingxing Wang,Yuhan Sheng,Yi Zhang,Zhifang Sun
This study presents a facile method to fabricate nanoporous carboxymethyl cellulose (CMC) aerogels with exceptional thermal insulation properties through metal ion cross-linking and supercritical carbon dioxide (scCO₂) drying. The as-prepared aerogels exhibit remarkable characteristics, including low density (as low as 0.15 g cm −3 ), high specific surface area (up to 303 m 2 g −1 ), high compression strength (stress of 17.31 MPa at 80 % strain), and low thermal conductivity (as low as 21.7 mW (m K) −1 ). The effects of varying CMC concentrations on the density, specific surface area, morphology, and thermal insulation properties of the aerogels were systematically investigated. This work highlights the potential for tailoring CMC aerogel properties by adjusting the initial CMC concentration, offering new opportunities for developing cost-effective thermal insulation materials.
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
·
2025
·Vol. 37
·期 5
·04025108
·
IF 3
Fangfang Zhi,Xiaodan Tang,Liang Wang,Zhipeng Bai,Binbin Na,Lei Zhang,Guohui Yang,Linhua Jiang
Cellulose ethers (CE) are generally used in cement-based materials as viscosity modifying admixtures. However, previous investigations scarcely focused on the effect of CE on the carbonation behavior of host materials. This work studied the effect of CE on the carbonation behavior of cement pastes. The carbonation resistance of samples was determined using the carbonation depth and pH values. The changes in hydration products and microstructure of host materials were monitored to reveal the underlying mechanisms using electrochemical impedance spectroscopy, X-ray diffraction analysis, thermogravimetric analysis, scanning electron microscopy, and mercury intrusion porosimetry. The results indicate that CE decrease the portlandite (CH) content and inhibit the growth of CH crystal with a smaller size and eroded edges, thus increasing its reactivity with CO2 during carbonation. CE increase the porosity and coarsen the pore structure because of the air-entrainment effect in cement pastes, promoting the CO2 diffusion in the system. As a result, CE decrease the carbonation resistance of cement pastes with increasing the CE content.
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高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Chao Zhong,Chunming Wang,Fan Huang,Honghua Jia,Ping Wei
In this article, a novel and high efficient solvent, tetra - n -Butylammonium Hydroxide (TBAH), was used for dissolution and isolation of straw cellulose from wheat straw. The composition analysis with gas chromatography (GC) and the spectroscopic characterization analysis conducted by X-Ray diffraction (XRD)/Fourier transform infrared spectroscopy (FTIR) indicated that straw cellulose can be directly dissolved and isolated by TBAH without derivatization . The investigation on the properties of straw cellulose isolation was based on the results of single factor experiments and orthogonal experiments, with optimum conditions for straw cellulose isolation being obtained as follow: reaction temperature 60 °C, reaction time 40 min, concentration of TBAH 50% and ratio of TBAH to straw 10:1 (m/m). In addition, as a solvent for cellulose, TBAH could be recycled several times with high activity being retained.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yi Liang,Yongyue Peng,Xinlong Zhou,Shuyuan Chen,Wei Li,Jian Li,Xiaoting Niu,Wei Guo
The extensive use of petroleum-based plastics has resulted in critical energy and environmental challenges, driving the pursuit of sustainable and biodegradable bioplastics as ideal alternatives. However, the development of functional bioplastics with superior mechanical strength, water stability, and thermal stability remains a formidable challenge. Herein, inspired by the nacre, a cellulose-based bioplastic was designed with a unique layered architecture and enhanced interfacial interactions，achieved through the self-assembly of carboxymethyl cellulose (CMC) and nano-montmorillonite, while simultaneously forming a chemically and physically double-crosslinked network under the action of TiO 2 nanoparticles and citric acid. The resulting bioplastic demonstrated excellent mechanical performance, with the tensile strength reaching 106.83 MPa, representing a 220.09 % improvement over pure CMC-based bioplastic and surpassing the tensile strength of other CMC-based films. Alongside mechanical prowess, it exhibited exceptional water resistance (water absorption reduced to 42.88 %), thermal stability and UV shielding. Furthermore, it was biodegradable and environmentally benign, capable of achieving complete degradation in the soil within three months. This biomimetic strategy provided a novel approach for developing competitive cellulose-based bioplastics, offering a promising alternative to petroleum-derived plastics for everyday applications.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yuhan Mai,Yang Zhou,Qihuang Ye,Zhiyou Wang,Chao Li,Yanling Chen,Huipingi Xiao,Yanyu Hu,Jiahui Li,Wei Zhang,Tongyao Wang,Haili Lin,Longguang Jiang,Cai Yuan,Peng Xu,Mingdong Huang
Microbial infection in open wounds can delay healing and lead to severe complications. This study introduces a bacterial-responsive cellulose-based fabric wound dressing (Fabric-PAC) with integrated antimicrobial and hemostatic functions. Fabric-PAC is chemically modified with polyphosphate (PolyP) and low-dose silver nanoparticles (AgNPs), and further functionalized with a phthalocyanine-based photosensitizer via supramolecular interactions on surface. Upon contact with bacteria, the photosensitizer is displaced, exposing PolyP to initiate blood coagulation and platelet-deriven tissue remodeling, promoting wound healing. Simultaneously, AgNPs are also exposed to provede sustained bacteriostasis. Moreover, the positively charged photosensitizer tightly attaches on the bacterial surface, and triggers the antimicrobial photodynamic effect upon illumination, rapidly eliminating pathogens. This study not only introduces a bacteria-responsive wound dressing with synergistic antimicrobial and hemostatic effects, but also offers a new strategy for the functionalization of cellulose-based materials.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Han Wang,Rongrong Shao,Xiao Meng,Yisheng He,Zhaojie Shi,Zhen Guo,Chunhong Ye
Birefringence has been attracting broad attention due to its strong potential for applications in biomedicine and optics, such as biomedical diagnosis, colorimetric sensing, retardant, and polarization encoding. However, engineering architectures with precisely controllable birefringence remains a challenge due to the lack of effective modulation of the localized orientation. Here, by taking advantage of the inherently one-dimensional (1D) anisotropic structure of cellulose nanocrystals (CNCs), we demonstrate an approach to tune the alignment of CNCs with a well-controllable orientation at localized preciseness, which is in contrast to the previously reported unidirectional/radical orientation of CNC-based birefringent structures. The localized modulation of CNC orientation is facilitated by directing the 1D nanocrystals to align along the template periphery and the migrated three-phase contact line during the evaporation. The resultant CNC films exhibit birefringent extinction patterns under polarized light, in which versatile pattern designs can be obtained by employing templates with different shapes and template arrays with varied layouts. Due to the locally modulated orientation of CNCs, the films indicate “kaleidoscope-like” dynamically transformable designs of the birefringent patterns depending on the polarized angle, which has barely been observed previously. Furthermore, an N-nary encoding system for abundant information storage is demonstrated based on the sunlight-transparent CNC films, but with visible extinction patterns under polarized light, which is promising for encryptions, anticounterfeiting, and imaging, enriching the attractive research area of bio-based photonics.
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PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 38
·期 9
·921-931
·
IF 3.154
Che Kun-Ming,Zhang Ming-Zu,He Jin-Lin,Ni Pei-Hong
The structure and properties of functional nanoparticles are important for stabilizing Pickering emulsion polymerization. Recently, cellulose nanocrystals (CNCs) are increasingly favored as a bio-based stabilizer for Pickering emulsions. In this study, we reported a novel functionalized polyphosphoester-grafted CNCs for the stabilization of oil-in-water Pickering emulsions and the emulsion polymerization of styrene. First, polyphosphoester containing an amino group at one end of the chain, abbreviated as PBYP-NH 2 , was prepared by ring-opening polymerization (ROP) and hydrolysis reaction, wherein PBYP represents poly[2-(but-3-yn-1-yloxy)-2-oxo-1,3,2-dioxaphospholane]. Subsequently, CNC-COOH was obtained via 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidation of CNCs. The functionalized nanocrystals CNC-PBYP-COOH with carboxyl groups and polyphosphoester on the surface were obtained by the amidation reaction of PBYP-NH 2 with CNC-COOH. Finally, we used CNC-PBYP-COOH as sole particle emulsifiers to stabilize styrene-in-water Pickering emulsions and studied its effects on the emulsions in details by using dynamic light scattering (DLS). The results indicated that the properties of these emulsions depended on the concentration of hydrophobically modified CNCs, volume ratios of oil to water, and pH values. The modified CNCs had higher ability to stabilize the styrene-in-water emulsions relative to the unmodified CNCs, and a stable oil-in-water (o/w) Pickering emulsion with diameter of hundreds of nanometers could be obtained. The resulting emulsions could be polymerized to yield nanosized latexes. The polyphosphoester-modified CNCs as green particle emulsifiers can efficiently stabilize nanoemulsions and latexes, which would promote the development of novel environmentally friendly materials.
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高影响因子
危险品化学品经营许可证（带存储）