CELLULOSE
·
2018
·Vol. 26
·期 3
·1747-1755
·
IF 3.809
Zhou Ting,Cheng Xudong,Pan Yuelei,Li Congcong,Gong Lunlun
Abstract Polyvinyl alcohol (PVA)/cellulose nanofibers (CNFs)/Gelatin hybrid organic aerogels were synthesized using a facile and environmentally friendly freeze-drying method. The biobased gelatin acted as a cross-linking agent and combined PVA and CNFs tightly by hydrogen bonds. The composites were characterized and analyzed by various techniques including uniaxial compression test, scanning electron microscopy, as well as thermal conductivity analysis and TGA–DTG analyses. The mechanical properties were strengthened significantly with the introduction of a small amount of gelatin. The modulus of PVA/CNF/G3 was 1.65 MPa, nearly eightfold of the PVA/CNF aerogel and 91 times higher than the neat CNF aerogel. Microstructure analyses revealed the three-dimensional network of the aerogels. The composites also possess good thermal stability, low density, and low thermal conductivity. Therefore they have broad prospects in the field of thermal insulation. Graphical abstract
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DOI
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jie Wei,Shuai Jia,Jie Wei,Chao Ma,Ziqiang Shao
Although humidity-responsive actuators serve as a promising candidate in smart wearables, artificial muscles, and biomimetic devices, most of them derived from synthetic polymers could not simultaneously achieve multifunctional properties. In this work, a cellulose nanofiber (CNF)-based film actuator with high mechanical properties, excellent Joule heating, and antibacterial capability is successfully constructed by integrating with Ti3C2Tx (MXene) and tannic acid (TA) via a vacuum-assisted filtration approach. Owing to the unique nacrelike structure and strong hydrogen bonds, the tensile strength and toughness of the composite film could reach 275.4 MPa and 10.2 MJ·m–3, respectively. Importantly, the hydrophilic nature of CNFs and alterable interlayer spacing of MXene nanosheets endow the composite film with sensitive humidity response and extraordinary stability (1000 cycles). With the assistance of MXene nanosheets and TA, the composite film could not only present outstanding Joule heating but also possess remarkable antibacterial properties against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus. Benefiting from the above merits, the proof-of-concept smart garment is assembled by the as-prepared film and is capable of regulating humidity and temperature.
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DOI
PubMed
高影响因子
Polymers
·
2019
·Vol. 11
·期 3
·458
·
IF 3.164
Wei Wang,Baikai Zhang,Shuai Jiang,Huiyu Bai,Shengwen Zhang
The major challenge in preparing polymer nanocomposites is to prevent the agglomeration of inorganic nanoparticles (NPs). Here, with regenerated cellulose (RC) films as supporting medium, UV-shielding and transparent nanocomposite films with hydrophobicity were fabricated by in situ synthesis of CeO2NPs. Facilitated through the interaction between organic and inorganic components revealed by X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR) characterization, it was found that CeO2NPs were uniformly dispersed in and immobilized by a cellulose matrix. However some agglomeration of CeO2NPs occurred at higher precursor concentrations. These results suggest that the morphology and particle size of CeO2and the corresponding performance of the resulting films are affected by the porous RC films and the concentrations of Ce(NO3)3·6H2O solutions. The optimized nanocomposite film containing 2.95 wt% CeO2NPs had more than 75% light transmittance (550 nm), high UV shielding properties, and a certain hydrophobicity.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 33
·20081-20088
·
IF 3.361
Lechen Yang,Yan Wu,Feng Yang,Wenhao Wang
As a natural biological material, wood has renewability, biocompatibility, biodegradability and excellent mechanical properties. This research shows a conductive polymer composed of a cellulose-based flexible film constructed from natural wood and carbon nanotubes. Part of the lignin/hemicellulose of the natural wood was removed by the deep eutectic solvent to obtain a cellulose-based flexible film with a porous structure, and then the carbon nanotubes were infiltrated into the cellulose-based flexible film by vacuum pressure impregnation treatment to obtain the final conductive polymer. This conductive polymer has high conductivity and good toughness, and shows good perception ability under a certain range of strain/stress or human activity conditions. In addition, conductive fibers can be prepared by cutting and twisting the oriented cellulose nanofibers of this conductive polymer. The above-mentioned properties of this conductive polymer provide great potential for its development in electrical-related fields.
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高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Huiyu Bai,Zhangkang Li,Shengwen Zhang,Wei Wang,Weifu Dong
Polyvinyl alcohol/cellulose nanocrystals/poly(2-Hydroxyethyl methacrylate) (PVA/CNC/polyHEMA) and PVA/CNC/poly(N'-methylenebisacrylamide) (PVA/CNC/polyMBA) hydrogels were prepared by photo-crosslinking followed by freezing/thawing (F-T) cycle and this novel preparation method was reported. The formation of interpenetrating polymer networks (IPN) resulted from the addition of crosslinking HEMA or MBA monomers displayed improved interfacial adhesion. The produced hydrogels were measured by scanning electron microscopy (SEM), real-time fourier transform infrared (RTIR), thermogravimetric analysis (TGA), mechanical, swelling and adsorption tests. The results showed both PVA/CNC/polyHEMA with semi-IPN and PVA/CNC/polyMBA with dual network (DN) hydrogels had higher thermal stability, lower water loss rate and better swelling and reswelling and mechanical properties, comparing to PVA and PVA/CNC hydrogels. The adsorption behaviors of hydrogels using xylenol orange (XO) and methylene blue (MB) as model dyes were evaluated, indicating that PVA/CNC/polyHEMA and PVA/CNC/polyMBA hydrogels could hold some dyes. Overall, this work provided a good way for increasing mechanical, swelling, reswelling, thermal, and adsorption properties of PVA/CNC, which will be a promising water-manageable material for agriculture application and a candidate for dye carrier.
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Shuai Jiang,Meiling Zhang,Mengmeng Li,Jianhua Zhu,Aixiong Ge,Lifang Liu,Jianyong Yu
Cellulose nanofibrils (CNFs) have been developed as building blocks for highly porous foams which are superior in thermal insulation. Unfortunately, the flammability and poor mechanical performance of CNF foams limited their practical applications. In this strategy, biopolymer sodium alginate , together with nontoxic boric acid and borate, were explored to play the roles of flame retardants for methyltrimethoxysilane cross-linked CNF foams. Their co-effects on preventing CNF foams from being ignited were revealed. The composite foams were self-extinguish and showed a considerably increased limited oxygen index (up to 39.5%). Additionally, the foams were flexible with good resilience and bendability. The eco-friendly foams with low thermal conductivity (0.028 W m −1 K −1 at 25 °C), flexibility, and non-ignitability can meet the satisfactory in energy-conservation, wide applicability, and use safety.
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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
Polymers
·
2019
·Vol. 11
·期 12
·2067
·
IF 3.164
Ruiping Tong,Guangxue Chen,Junfei Tian,Minghui He
To extend the applications of natural polymer-based hydrogels to wearable sensors, it is both important and a great challenge to improve their mechanical and electrical performance. In this work, highly stretchable, strain-sensitive, and ionic-conductive cellulose-based hydrogels (CHs) were prepared by random copolymerization of allyl cellulose and acrylic acid. The acquired hydrogels exhibit high stretchability (~142% of tensile strain) and good transparency (~86% at 550 nm). In addition, the hydrogels not only demonstrate better sensitivity in a wide linear range (0–100%) but also exhibit excellent repeatable and stable signals even after 1000 cycles. Notably, hydrogel-based wearable sensors were successfully constructed to detect human movements. Their reliability, sensitivity, and wide-range properties endow the CHs with great potential for application in various wearable sensors.Keywords:stretchability;strain sensitivity;cellulose-based hydrogels;ionic conductivity;wearable sensors
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DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 6
·592
·
IF 2.935
Wenbo Chen,Hui He,Hongxiang Zhu,Meixiao Cheng,Yunhua Li,Shuangfei Wang
A thermo-responsive cellulose-based material (cellulose-g-PNIPAAm) was prepared by graftingN-isopropylacrylamide (NIPAAm) onto bagasse pulp cellulose via Ce (IV)-initiated free radical polymerization. The surfaces of the obtained cellulose-g-PNIPAAm paper showed a rapid wettability conversion from being hydrophilic (water contact angles (WCA) of 0°) at 25 °C to becoming hydrophobic (WCA of 134.2°) at 45 °C. Furthermore, the thermo-responsive mechanism of cellulose-g-PNIPAAm was examined by the in situ variable-temperature13C NMR,1H NMR and AFM analysis. At the same time, the resulting cellulose paper was applied for a switchable separation of oil/water mixtures. Water can pass through the paper under 45 °C, while oil is kept on the paper. When the temperature is above 45 °C, oil can permeate through the paper, while water cannot pass through the water. Moreover, the paper exhibited excellent regeneration performance after five cycles and maintained its switchable wettability.Keywords:thermo-responsive;controllable oil/water separation;in situ variable-temperature NMR;cellulose;chemical grafting
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Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-17
·
IF 9.043
Cao Wentao,Ma Chang,Tan Shuo,Ma Mingguo,Wan Pengbo,Chen Feng
An ultrathin and flexible carbon nanotubes/MXene/cellulose nanofibrils composite paper with gradient and sandwich structure was successfully fabricated via a facile alternating vacuum-assisted filtration process.
The composite paper exhibits excellent mechanical property and electromagnetic interference shielding performance.
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高影响因子
Polymers
·
2024
·Vol. 16
·期 2
·285
·
IF 4.7
Rengui Weng,Guohong Chen,Xin He,Jie Qin,Shuo Dong,Junjiang Bai,Shaojie Li,Shikang Zhao
Water scarcity and water pollution have become increasingly severe, and therefore, the purification of water resources has recently garnered increasing attention. Given its position as a major water resource, the efficient purification of drinking water is of crucial importance. In this study, we adopted a phase transition method to prepare ZrO2/BCM (bamboo cellulose membranes), after which we developed IP-ZrO2/BC-NFM (bamboo cellulose nanofiltration membranes) through interfacial polymerization using piperazine (PIP) and tricarbonyl chloride (TMC). Subsequently, we integrated these two membranes to create a combined “ultrafiltration + nanofiltration” membrane process for the treatment of drinking water. The membrane combination process was conducted at 25 °C, with ultrafiltration at 0.1 MPa and nanofiltration at 0.5 MPa. This membrane combination, featuring “ultrafiltration + nanofiltration,” had a significant impact on reducing turbidity, consistently maintaining the post-filtration turbidity of drinking water at or below 0.1 NTU. Furthermore, the removal rates for CODMNand ammonia nitrogen reached 75% and 88.6%, respectively, aligning with the standards for high-quality drinking water. In a continuous 3 h experiment, the nanofiltration unit exhibited consistent retention rates for Na2SO4and bovine serum protein (BSA), with variations of less than 5%, indicating exceptional separation performance. After 9 h of operation, the water flux of the nanofiltration unit began to stabilize, with a decrease rate of approximately 25%, demonstrating that the “ultrafiltration + nanofiltration” membrane combination can maintain consistent performance during extended use. In conclusion, the “ultrafiltration + nanofiltration” membrane combination exhibited remarkable performance in the treatment of drinking water, offering a viable solution to address issues related to water scarcity and water pollution.
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PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Wanting Zhang,Tian Xia,Shiyun Zhou,Mengmeng Guo,Wei Zhang,Peng Zhu
High-strength electrochemical corrosion-resistant materials hold significant application value in marine engineering and construction sectors. In this study, cellulose nanocrystals (CNCs) extracted from microcrystalline cellulose (MCC) via sulfuric acid hydrolysis were incorporated into polyurethane (PU) through in situ polymerization to systematically investigate the effects of CNC addition timing (soft segment, hard segment, chain extender, and prepolymer stages) on material properties. Low-field nuclear magnetic resonance (LF-NMR) relaxation analysis revealed that introducing CNC during the prepolymer stage most dramatically enhanced molecular chain rigidity, as evidenced by the most pronounced relaxation decay. Fourier transform infrared spectroscopy (FTIR) confirmed that CNC incorporation significantly increased the hydrogen bonding index (HBI), with later addition stages yielding greater HBI enhancement. Dynamic mechanical analysis (DMA) further demonstrated that prepolymer-stage CNC addition substantially improved dynamic cross-linking density, thereby endowing the composites with superior mechanical performance. Electrochemical impedance spectroscopy (EIS) measurements showed a remarkable 2–4 orders of magnitude increase in impedance modulus for all PU/CNC composites, validating CNC’s corrosion protection efficacy.
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