CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Linjuan Duan,Rongrong Liu,Yan Duan,Zhiqiang Li,Qun Li
In this study, a simultaneous method with nano-fibrillation of acetylation modified fibers (A-cellulose) and preparation of cellulose nanofiber (CNF)/apolar polymer composites are proposed. The A-cellulose and isotactic polypropylene (iPP) were initially mixed and then melt-compounding in a twin-screw extruder. Due to the reduction of hydrogen bonding force inside A-cellulose and the high shear force provided by the extruder, acetylated cellulose nanofiber (A-CNF) distributed with the state of a three-dimensional network in PP composites (ACPP) were successful prepared. The scanning electron microscopy (SEM) images of A-CNF, dynamic mechanical analysis (DMA) and X-ray diffraction (XRD) results of ACPP showed that the A-CNF had good interface compatibility with PP matrix , and had the effects of inducing PP crystallization, decreasing crystal size and increasing the ratio of γ crystals in composites, which could improve the mechanical and thermodynamic properties of composites.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2015
·
IF 2.858
Guowei Wang,Jiarong Guo,Linghua Zhuang,Yan Wang,Bin Xu
Gemini imidazolium ionic liquid , 3,3′-[1,2-ethanediylbis (oxy-2,1-ethanediyl)]-bis[1-methyl-imidazolium]-dibromide ([C 6 O 2 (mim) 2 ][Br] 2 ), was used for the dissolution and regeneration of white hide powder (from pigskin), and blend white hide powder with cellulose for the easy production of white hide powder/cellulose composite. Dissolution performance of white hide powder in [C 6 O 2 (mim) 2 ][Br] 2 was studied. The native white hide powder and [C 6 O 2 (mim) 2 ][Br] 2 regenerated white hide powder were characterized by FT-IR, XRD, DSC–TG and FE-SEM. The results showed that [C 6 O 2 (mim) 2 ][Br] 2 was a good solvent to white hide powder. The dissolution time was 55 min when the white hide powder was 8% at 120 °C. The dissolution time of [C 6 O 2 (mim) 2 ][Br] 2 for white hide powder was shorter than those of common ionic liquids. The triple helical structure of white hide powder was partly destroyed during [C 6 O 2 (mim) 2 ][Br] 2 dissolution. The possible mechanism of white hide powder dissolution in [C 6 O 2 (mim) 2 ][Br] 2 and the regeneration of white hide powder in methanol had been proposed. White hide powder/cellulose composites were successfully dissolved in [C 6 O 2 (mim) 2 ][Br] 2 . The performance of white hide powder/cellulose film was measured by FT-IR and TG. The tensile strength , and elongation at break of white hide powder/cellulose composite films were tested. This work demonstrated that the white hide powder/cellulose composite exhibited some potential in collagen-based tissue engineering.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Bin Zhou,Xiaoqian Hu,Jinjin Zhu,Zhenzhen Wang,Xichang Wang,Mingfu Wang
Layer-by-layer (LBL) assembled films have been exploited for surface-mediated bioactive compound delivery. Here, an antioxidative hydrogen-bonded multilayer electrospun nanofibrous film was fabricated from tannic acid (TA), acting as a polyphenolic antioxidant, and poly(ethylene glycol) (PEG) via layer-by-layer assembly. It overcame the burst release behavior of nanofibrous carrier, due to the reversible/dynamic nature of hydrogen bond, which was responded to external stimuli. The PEG/TA nanofibrous films disassembled gradually and released TA to the media, when soaked in aqueous solutions. The release rate of TA increased with increasing bilayer number, pH and temperature, but decreased with enhancing ionic strength. The surface morphology of the nanofibrous mats was observed by scanning electron microscopy (SEM). The following antioxidant activity assay revealed that it could scavenge DPPH free radicals and ABTS + cation radicals, a major biological activity of polyphenols. This technology can be used to fabricate other phenolic-containing slowly releasing antioxidative nanofibrous films.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 10
·5645-5658
·
IF 6.123
Qiu Xianyu,Wang Shuoyu,Chen Shuixia
Abstract Cellulose-nanofiber-based hydrogels (CNF-Gel) exhibit excellent mechanical properties and designable functions. However, it is difficult to coordinate the complex self-assembly structure and various functions, which limits the widespread use of CNF-Gel. Here, a simple and environmental-friendly approach for the preparation of three-dimensional dialdehyde-cellulose-nanofiber-based hydrogels (DAC-Gel) was developed via periodate oxidation of cellulose-nanofiber and freeze drying. The self-assembled DAC-Gel with flexible skeleton structure and numerous aldehyde groups was synthesized without organic solvents or cross-linking agents added. After 100 compression-releasing cycles at a maximum compressive strain of 30%, DAC-Gel-1.5 remained high stress remaining and low energy loss coefficient, demonstrating durable compressive property. As the functional intermediate, DAC-Gel can be further modified to conveniently prepare functional products, which shows a variety of potential applications such as in the carbon capture and storage. After amination with polyethylenimine via Schiff base reaction, the DAC-based CO 2 adsorbent DAC-1.5@PEI still remained good elasticity. The introduction of PEI endowed DAC-1.5@PEI with high nitrogen content (18.57 wt%) and CO 2 adsorption capacity (2.63 mmol/g) under humid condition. This research develops a synthesis method of flexible and three-dimensional cellulose-based materials from another perspective, and provides useful information for understanding the synthesis process of DAC-Gel in different sizes. Graphical abstract
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Frontiers in Energy Research
·
2022
·
IF 3.858
Cui Jiedong,Lu Pengbo,Li Yinghui,Xu Ke,Li Yang,Shen Haoyu,Liu Chaocheng,Zhang Tianyi,Liu Detao
The flexible and transparent film heaters (FTFHs) with the advantages of mechanical flexibility, portability, and excellent electrothermal performance, are key to the next generation portable, wearable heaters and thermal protection systems. However, the present flexible and transparent substrates of FTFHs are fabricated by typical plastic PET films, which suffer from poor interfacial adhesion with the thermally conductive materials. In this work, the transparent regenerated cellulose fibers made of completely dissolved in NMMO solution followed by regeneration process is presented to disperse and support carbon nanotubes (CNTs) by a vacuum-dewatering process. In the presence of cellulose fibers, these CNTs have strong hydrogen bonding properties in the dehydration-deposition process and thus respond to tight intertwining structures in fibrous composites. The resulting regenerated cellulose fibers exhibit high optical transparency of 88% (@550 nm) and good mechanical properties (30 MPa). Interestingly, the FTFHs show a rapid heating response, high generation temperature, and resistance stability for up to 2 h. The FTFHs made with earth-abundant, cost-effective, and recyclable materials, have excellent potential in the areas of green flexible and transparent film heaters.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Shuo Zhang,Yanqiu Pan,Wei Wang,Runze Lin,Xuewu Liu
Nanofibrillated cellulose (NFC)/chitosan (CS) composite aerogel with underwater superoleophobicity was prepared by freeze-drying for oil/water separation. The soft-ice freezing technique was employed to construct cellular pores for improving the mechanical performance while enhancing mass transfer of freeze-drying. The dielectric-aided microwave heating was adopted to enhance heat transfer of freeze-drying. The results showed that the prepared NFC/CS aerogel exhibited an excellent mechanical property with a stress of 87.16 kPa at 80% strain, and underwater superoleophobicity with all oil contact angles above 150˚. The proposed drying method could save over 40% of drying time, achieving a simultaneous mass and heat transfer enhancement of freeze-drying. The prepared aerogel provided separation efficiencies of all above 99.96% and average permeate fluxes of 0.817 and 0.826 L·m −2 ·s −1 after 20 cycles for oil/water and oil/seawater separations. The research results are expected to provide an economical and sustainable solution for the industrial oily wastewater treatment .
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高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Kefeng Zhang,Yanjun Pang,Changzhou Chen,Miao Wu,Yuxiang Liu,Shitao Yu,Lu Li,Zhe Ji,Jinhui Pang
In this study, the anti-freezing conductive hydrogel electrolytes with outstanding mechanical properties were synthesized by a facile and feasible method. The mechanical and anti-freezing properties of the synthesized polyacrylamide/lithium lhloride/water soluble cellulose acetate (PAM/LiCl/WSCA) hydrogels are significantly enhanced with the addition of WSCA and LiCl. The tensile strength and toughness of the gels were gradually increased to 341 KPa and 1.2 MJ/m 3 , respectively. The hydrogel electrolyte can remain soft and flexible at −80 °C, displaying certain elasticity and electrical conductivity . In addition, the super-capacitor assembled with PAM/LiCl/WSCA hydrogel as electrolyte showed excellent stability in capacitance retention after 500 times of folding cycles and 10,000 times of charge and discharge tests. The capacitor still maintains 64.64 % of its capacity at −40 °C. This facile strategy to fabricate anti-freezing conductive hydrogel electrolyte provides a new idea and way to the application of hydrogels as electrolytes in extreme cold environments.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 7
·3789-3804
·
IF 4.21
Xu Wenlong,Xin Binjie,Yang Xue
Polyacrylonitrile (PAN)/cellulose nanofibril (CNF) based carbon nanofiber membranes were produced by electrospinning and carbonization method, in which the CNF amount was 1 wt%. In order to control the spinning process, the rheological properties of the PAN/CNF suspensions were measured before electrospinning. In addition, the effects of CNF particle size on the structure and properties of carbon nanofiber membranes were investigated systematically by SEM, FTIR and mechanical test. Meanwhile, the reaction mechanism of PAN and PAN/CNF nanofiber membranes in the process of stabilization and carbonization was also fully discussed. The results show that the addition of CNFs can improve the breaking strength and conductivity of PAN carbon nanofiber membrane. Moreover, CNFs also can accelerate the carbonization rate and reduce the reaction conditions of PAN nanofiber membranes. Therefore, CNFs are effective enhancers for PAN based carbon nanofiber membranes.
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高影响因子
Sugar Tech
·
2020
·Vol. 22
·期 6
·1138-1147
·
IF 1.198
Li Xin,Deng Ligao,Li Yi,Li Kai
Polylactic acid (PLA) is biodegradable and biocompatible, but some of its functional properties limit its commercial application. To improve the properties of PLA without destroying other useful characteristics, a composite film consisting of microcrystalline cellulose (MCC) and PLA was prepared. In this research, MCC was obtained from bagasse bleached pulp by hydrochloric acid hydrolysis. After being modified by a silane coupling agent (KH550), the MCC was used as reinforcement in the PLA matrix. The degradation performance of the composite film was explored using degradation experiments in which the film was buried in soil. According to the single-factor experiments, the best composite formulation was 3% KH550, 20% KH550-MCC and 15% acetyl tributyl citrate. The results showed that the interfacial compatibility of the MCC/PLA composite films was improved after MCC was modified with KH550. This research showed that the addition of MCC can enhance the degradation rate of MCC/PLA composite films.
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高影响因子
Coatings
·
2020
·Vol. 10
·期 11
·1032
·
IF 2.436
Chengrong Qin,Wei Wang,Wei Li,Song Zhang
Paper packaging materials have been widely applied in our daily life. To maintain the quality of packed goods as well as the mechanical property, there is a need to enhance the paper water vapor barrier function. Although long-chain cellulose esters with saturated aliphatic chains have been employed as barrier coatings due to their excellent hydrophobicity as well as film-forming properties, the coated unsaturated cellulose esters would be beneficial to design reactive materials to further enrich their functionalities, e.g., antibacterial performance. Herein, solutions of cellulose undecenoyl esters (CUEs) were bar-coated to base papers. Obvious coating films were formed on the paper surfaces from the coating grammage of 6.25 g m−2. The resulting CUE-coated papers displayed good mechanical performance, hydrophobicity, and water vapor barrier property (the barrier ratio up to 66.35%), and the best coating grammage was 11.62 g m−2. Additionally, the reactivity of the coated paper was evaluated by further immobilization of the antibacterial agent (polyhexamethylene guanidine hydrochloride (PHGH)) using photo-click thiol-ene and condensation reaction. The generated paper exhibited good antibacterial and water vapor barrier performance. The obvious reactivity of our CUE-coated paper indicated the great possibility to design multi-functional paper packaging materials.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Zongze Yao,Shu Mi,Bin Chen,Fei Liu,Haining Na,Jin Zhu
The acylation modification of cellulose to make it processable is an important method to utilize this green, renewable material with broad prospects. However, it usually takes several hours or even more than 20 h to obtain products with a high degree of substitution (DS) through the methods reported in the existing literature, especially for cellulose acetate (CA). In this study, rapid homogeneous acylation of cellulose is achieved in a novel CO2 switchable solvent system by using microwave heating. CA products with DS ranging from 1.83 to 2.91 can be obtained within 3–15 min by using acetic anhydride as the acylation reagent. This strategy can also be applied for the synthesis of a series of cellulose esters with different side chain lengths, and it takes only 10 min to produce cellulose esters with a DS higher than 2.20 under microwave heating. This study suggests a facile and effective method for the synthesis of cellulose esters.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Yu Guo,Rongbo Guo,Xiaoshuang Shi,Shujuan Lian,Qiannan Zhou,Ying Chen,Weifeng Liu,Wei Li
In this study, cellulose-based superabsorbent hydrogel was synthesized from sodium carboxymethyl cellulose (CMC-Na), acrylic acid (AA), and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) to enhance its water absorbency and salt tolerance for soil-conditioning applications in areas suffering from drought and soil salinization. Superabsorbent hydrogels (SHs) were prepared by CMC-Na and AMPS successfully, using chemical graft technology. Structure, morphology, thermal stability , and water absorbency of SHs were deduced. The cellulose-based hydrogel showed a high salt tolerance that the maximum water absorbency reached 604 and 119% in distilled water and saline water, respectively. The swelling behavior in aqueous solvents indicated that the water absorption of hydrogels was improved with the increasing ratio of CMC-Na. All SHs exhibited adsorption of nitrogen with the maximum adsorption of ammonia nitrogen 30 mg·g −1 and the presence of hydrogels could slow down the loss of nutrients in the soil. This study provided a feasible strategy that AMPS was substituted by CMC-Na to synthesize SHs with strong water absorbency and high salt tolerance which could be efficiently applied in agriculture as a soil conditioner.
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高影响因子
危险品化学品经营许可证（带存储）