ACS Applied Polymer Materials
·
2021
·
IF 4.089
Jie Hu,Zhengqing Kong,Ke Liu,Jinli Qin,Yuhong Tao,Lijuan Zhou,Yuan Yuan,Min Jiang,Yongxin Duan,Jianming Zhang
The surface functionalization of cellulose nanocrystals (CNCs) and the construction of strong interfacial adhesion between CNCs and the rubber matrix are effective ways to achieve high-performance rubber/CNCs nanocomposites. Herein, carboxylation of sulfonic CNCs (CNC–OSO3H) was conducted in an aqueous medium by using citric acid (CA) as the modifier. A large number of carboxyl groups were successfully grafted on the surface of CNC–OSO3H, and most of the sulfonic groups were removed, which endows the carboxylated CNC–OSO3H (abbreviated as CNC–CA) with higher chemical reactivity and thermal stability. Subsequently, carboxylated styrene-butadiene rubber (XSBR)/CNC–CA nanocomposites with a dual cross-linking network were prepared by using polyethylene glycol diglycidyl ether (PEGDE) as the cross-linking agent and CNC–CA as reinforcing fillers. Fourier transform infrared spectroscopic investigation found that in the obtained nanocomposites, the carboxyl groups on CNC–CA and XSBR formed hydrogen bonds (physical cross-linking) with each other, and the carboxyl groups formed covalent bonds with the epoxy group on PEGDE simultaneously. The coexistence of physical and chemical cross-linking improved the interface compatibility between CNC–CA and the XSBR matrix, accelerated the homogeneous dispersion of CNC–CA, and realized the cross-linking of the matrix itself. As expected, XSBR/CNC–CA nanocomposites with a dual cross-linking network showed a remarkable enhancement in tensile strength (up to 500%), modulus (up to 151%), and work of fracture (up to 348%). This work provides both a facile and green approach to obtain carboxylated CNCs and a convenient method for the preparation of high-performance rubber nanocomposites with dual cross-linking networks.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Chao Yang,Zhijian Zhang,Zhongliang Tian,Yanqing Lai,Kai Zhang,Jie Li
Two anodized-layer structures of zinc in alkaline solution were obtained by different anodic polarizations in 6 M KOH, which contained different carboxymethyl cellulose (CMC) molecular weights (MWs). The electrochemical characteristics and electrodeposition behaviors of the oxide layers, which were obtained before and after passivation, were investigated. Results of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Tafel polarization curves and zinc deposition indicated that different CMC MWs showed opposite effects on the porous oxide layer and passive film. Scanning electron microscopy analyses revealed that CMC with different characteristics can influence the surface structures of the porous oxide layer and passive film.
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高影响因子
Journal of Renewable Materials
·
2021
·Vol. 9
·期 10
·1673-1684
·
IF 1.67
Li Qiaoguang,Yan Xuming,Chen Jialong,Shu Xugang,Jia Puyou,Liang Xiangjun
Environmental cleaning is an important aspect of bacteria control. Ethyl cellulose microcapsules containing potassium monopersulfate (PMCM) were prepared by emulsified solvent diffusion method. The chemical structure and microstructure of the obtained PMCM was characterized by methods
of Fourier transform infrared spectroscopy (FT-IR), optical microscopy, scanning electron microscopy and X-ACT energy dispersive X-ray spectroscopy. The SEM micrographs of the PMCM containing 21.6% of C, 46.8% of O, 10.7% of S and 19.4% of K was relatively smooth. Thermal stability, sustained
release performance, and antimicrobial activity of PMCM were investigated. The results showed that the drug loading and encapsulation efficiency of PMCM were 30.3% and 42.6% respectively. Potassium monopersulfate was fully released after 8 h, following a Fickian diffusion mechanism. Results
showed that the microcapsules prepared with a high concentration of potassium monopersulfate solution showed a good antimicrobial effect. The microcapsule wall of the resulting PMCM increased with increasing ethyl cellulose content and had high thermal stability from the data of 69% residue
rate. The excellent thermal stability and high sustained release performance of PMCM showed high application value.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 12
·7953-7968
·
IF 5.044
Xing Xinyi,Li Wenqi,Zhang Jie,Wu Han,Guan Ying,Gao Hui
In this study, the hydrogel was prepared by dissolving and regenerating poplar cellulose in NaOH/urea/water system. The TEMPO-oxidized cellulose hydrogels (TCH) were prepared using microwave-assisted accelerated TEMPO-oxidation system. Polyethyleneimine (PEI) was grafted onto TCH with glutaraldehyde as a cross-linking agent and the products named as TCP. The hydrogels were characterized by SEM, FTIR, XPS, and elemental analyzer. The maximum adsorption capacities of Cu 2+ and Pb 2+ by TCP were 109.89 mg/g and 279.32 mg/g, respectively. TCP was a single molecule adsorption process with better fitting of the Langmuir model. Adsorption kinetics showed that the Pb 2+ adsorption rate of TCP was higher than that for Cu 2+ . The Cu 2+ affinity of TCP was higher than the Pb 2+ . The adsorption capacity of TCP for Cu 2+ and Pb 2+ was 58.26 mg/g and 91.96 mg/g, respectively, after five cycles. This study provided a promising option of preparing an efficient and recyclable adsorbent in treating wastewater containing heavy metal, such as Cu 2+ and Pb 2+ .
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高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Xuelin Yao,Xiaodong Qi,Yuling He,Dongsheng Tan,Feng Chen,Qiang Fu
In the present work, a series of thermoplastic polyurethane (TPU)/microfibrillated cellulose (MFC) nanocomposites were successfully synthesized via in situ polymerization. TPU was covalently grafted onto the MFC by particular association with the hard segments, as evidenced by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The adequate dispersion and network structure of MFC in the TPU matrix and the strong interfacial interaction through covalent grafting and hydrogen bonding between MFC and TPU resulted in significantly improved mechanical properties and thermostability of the prepared nanocomposites. The tensile strength and elongation-at-break of the nanocomposite containing only 1 wt % MFC were increased by 4.5-fold and 1.8-fold compared with that of neat TPU, respectively. It was also very interesting to find that the glass transition temperature (Tg) of TPU was decreased significantly with the introduction of MFC, indicating potential for low-temperature resistance applications. Most importantly, compared with TPU nanocomposites reinforced with other nanofillers, the TPU/MFC nanocomposites prepared in this work exhibited excellent transparency and higher reinforcing efficiency.
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高影响因子
MATERIALS LETTERS
·
2022
·
IF 3.574
Yong Hu,Weiming Zhu,Kaili Song,Zhicheng Yu
In this study, a novel bio-marine mussel inspired surface modification of cellulose nanocrystal and its enhanced interfacial strength toward keratin composites was developed and demonstrated for the purpose of developing high performance and fully renewable keratin composites. XPS and FTIR study of the poly-dopamine modified cellulose nanocrystal (PDA@CNC) confirmed that the functional layer was successfully coated on cellulose nanocrystal surface. The mechanical strength of 3% PDA@CNC/keratin composites could reach as high as 29.01 MPa, compare with that of 9.17 MPa of pure keratin film, due to the enhanced interfacial adhesion between PDA@CNC and keratin. This study demonstrated a facial and effective strategy for manufacturing mechanical enhanced keratin functional materials.
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高影响因子
CARBOHYDRATE POLYMERS
·
2014
·
IF 3.916
Xuefei Cao,Xinwen Peng,Shaoni Sun,Linxin Zhong,Wei Chen,Sha Wang,Run-Cang Sun
Hydrothermal conversion (HTC) is an important thermochemical process to upgrade low-cost biomass into valuable chemicals or fuels. As compared with non-catalytic HTC, catalytic HTC shows high energy efficiency on biomass upgradation. In this work, the catalytic performances of various transition metal sulfates (Mn 2+ , Fe 2+ , Fe 3+ , Co 2+ , Ni 2+ , Cu 2+ , and Zn 2+ ) in the HTCs of xylose , glucose, and cellulose under different conditions were explored. Among these catalysts, Zn 2+ and Ni 2+ showed obvious effects on the conversions of xylose, glucose, and cellulose into lactic acid, while Cu 2+ and Fe 3+ , which could significantly accelerate the hydrolysis of cellulose into glucose at 200 °C, displayed high efficiency on converting glucose and cellulose into levulinic acid and formic acid at high temperature. Additionally, significant positive correlative relationships among xylose, glucose, and cellulose degradations were observed. This study is helpful for screening appropriate catalysts for biomass upgradation through catalytic HTC of monosaccharide.
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 8
·5001-5017
·
IF 5.7
Guo Yan,Wang Yue,Jia Fangting,Li Sihang,Li Sheng,Sarp Sarper,Youravong Wirote,Li Zhenyu
Developing a sustainable separation membrane is imperative due to the growing environmental pollution caused by petrochemical-based polymers. Cellulose-based materials, including bacterial cellulose (BC), have exhibited potential as separation materials. Here, a novel BC membrane (BCM) is in-situ fabricated via microbial fermentation and physical post-treatment. Owing to the randomly assembled BC nanofibers and abundant hydroxyls on their surface, the obtained BCMs possess three-dimensional network structure with strong hydrophilicity. The BCMs properties can be manipulated by adjusting fermentation and drying conditions, satisfying different purposes for practical use. Extending fermentation time from 3 to 10 days, bacteria secret more BC nanofibers and form a denser membrane structure. Freeze-dried BCMs have the most porous structure and exhibit the highest flux (up to 52 L m −2 h −1 ) and molecular weight cut-off (up to 1000 KDa) under 2 bar. Press-dried BCMs obtain the highest tensile strength (up to 241.16 MPa) and BSA retention (up to 94.44%). Heat-dried BCMs show good prospects in the pressure-driven membrane process considering flux and retention and demonstrate favorable stability and flux recovery ratios (85.51%~96.43%). Modification of BCMs by carboxymethyl cellulose further promotes membrane hydrophilicity but causes denser structures than original BCMs. The present study proposes a sustainable cellulose membrane manufacturing strategy and demonstrates BCMs can be favorable alternatives to petrochemical-based membranes.
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高影响因子
MATERIALS LETTERS
·
2017
·
IF 2.572
Yirui Du,Huan Cheng,Yingzhan Li,Bijia Wang,Zhiping Mao,Hong Xu,Linping Zhang,Yi Zhong,Xiaolin Yan,Xiaofeng Sui
In this study, cellulose nanofiber (CNF) sponges were successfully prepared and modified with temperature-responsive poly-(N-isopropylacrylamide) (PNIPAM) via surface-initiated atom transfer radical polymerization (SI-ATRP). The structure and properties of the obtained CNF-g-PNIPAM sponges were characterized with FTIR, SEM, TGA and compression tests. Water permeation experiments were carried out to investigate the temperature-sensitivity of the sponge, excellent water flow manipulation could be achieved. The CNF-g-PNIPAM sponge holds great potential in applications such as temperature-trigged microfluidic devices, water/oil separation and filtration.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 19
·15313-15322
·
IF 2.779
Liu Dingyu,Du Guangyuan,Qi Yuruo,Niu Yubin,Bao Shu-juan,Xu Maowen
Quasi-solid-state sodium-ion batteries (QSSNIBs) are regarded as a wise choice that balances practicality with security. However, further improvements is hindered by low ionic conductivity at room temperature. Herein, based on bacterial cellulose network, a high-strength gel polymer electrolyte (BC-GPE) for QSSNIBs is developed. The interwoven structure with abundant 3D ion transport passageways of BC-GPE make it display both high-strength (tensile strength of 36 MPa and maximum strain of 31.23%) and the inhibitory of “sodium dendrite” and “dead sodium” (an outstanding average coulombic efficiency of 98.3% and 190 cycles at 0.5 mA/cm 2 and 1 mAh/cm 2 in the Na/BC-GPE/SS cell). Furthermore, due to the excellent electrochemical properties of BC-GPE and the compatibility with NASICON type cathode Na 3.5 Mn 0.5 V 1.5 (PO 4 ) 3 @C (NMVP@C), the QSSNIBs demonstrate high-rate performance and long cyclic life of 1250 cycles with a capacity decay rate of only 0.005%. All of these findings in this work can provide a novel insight for designing other high-strength GPEs and some new ideas for the potential applications of QSSNIBs in the near future.
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高影响因子
Journal of Hazardous Toxic and Radioactive Waste
·
2017
·Vol. 22
·期 2
·04017029
·
IF 0
Aili Yang,Junhong Wu,C. P. Huang
A composite graphene oxide-cellulose (GOC) adsorbent was prepared from raw materials of graphite and cellulose. The structure and micromorphology of the products were characterized by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and scanning electron microscopy (SEM). The adsorption characteristics of GOC together with graphite oxide (GO) in terms of uranium(VI) removal from aqueous solution was investigated in the batch mode reactor. The effect of solution pH, adsorbent dosage, and contact time on the adsorption characteristics of uranium(VI) was studied. Results were fitted by both the Langmuir and the Freundlich adsorption isotherms. The removal efficiency of uranium(VI) was strongly dependent on the solution pH. Graphene oxide-cellulose was used to treat a real uranium(VI)-bearing wastewater and results were promising of GOC for the management of radioactive industrial wastewater.
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EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
·
2015
·
IF 3.85
Kai Feng,Lei Hou,Cody A. Schoener,Peiyi Wu,Hao Gao
Using novel time-dependent ATR-FTIR technique and two-dimensional correlation analysis (2Dcos), the migration behavior of drugs with varying water solubilities was investigated with ethyl cellulose (EC) films prepared with different kinds of pore formers and/or plasticizers. Three major stages were determined for drug migration: (1) water migrated from the drug-saturated solution to the other side of the EC film, (2) upon saturation of the film, water migration ceased and enough pore former was dissolved, and (3) upon dissolution of enough pore former, channels were formed between both sides of the EC film causing drug migration to begin and water migration to return. Further investigations demonstrated a reduction or elimination in second stage with increasing water solubility of the pore former and/or decreasing water solubility of the drug. These results offer a mechanistic understanding of water and drug migration across EC films not previously studied and might provide an effective guide for the preparation of EC pharmaceutical coating with desired drug release behavior.
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高影响因子
危险品化学品经营许可证（带存储）