International Journal of Polymer Science
·
2017
·Vol. 2017
·期 1
·9850814
·
IF 1.077
Zhijun Hu,Rui Zhai,Jing Li,Yan Zhang,Jiang Lin
Nanofibrillated celluloses (NFCs) have recently drawn much attention because of their exceptional physicochemical properties. However, the existing preparation procedures either produce low yields or severely degrade the cellulose and, moreover, are not energy efficient. The purpose of this study was to develop a novel process using ultrasonic homogenization to isolate fibrils from bamboo fiber (BF) with the assistance of negatively charged entities. The obtained samples were characterized by the degree of substitution (DS) of carboxymethyl, Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis, and transmission electron microscopy (TEM). The results showed that an NFC yield could be obtained above 70% through this route. The enzyme hydrolysis could enhance the surface charge of the fiber, and mechanical activation facilitates an increase in the DS. The disintegrating efficiency of the cellulose fibrils significantly depended on the input power of ultrasonication and the DS. FT-IR spectra confirmed the occurrence of the carboxymethylation reaction based on the appearance of the characteristic signal for the carboxyl group. From XRD analysis, it was observed that the presence of the carboxyl groups makes the isolation more efficient attributed to the ionic repulsion between the carboxylate groups of the cellulose chains.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xiaoxiao Sun,Jiafeng Shen,Di Yu,Xiao-kun Ouyang
In this study, we prepared pH- and magnetism-responsive Fe 3 O 4 @C/carboxymethyl cellulose (CMC)/chitosan composite microbeads for controlled release of diclofenac sodium (DS) to (i) prevent complete drug release in gastric area, (ii) maintain blood drug concentration in a specific part of the body, (iii) reduce drug administration time and systemic drug toxicity , and (iv) improve drug efficacy. Through one-step solvent thermal treatment, a polyethylene glycol layer was wrapped into Fe 3 O 4 nanoparticles . Then, Fe 3 O 4 @C nanoparticles were incorporated into CMC matrix and coated with chitosan layer via a self-assembly technique to form core–shell polyelectrolyte complexes (PECs). The composite beads were characterized by SEM, TEM , FT-IR spectrometry , and TGA . In addition, the effect of different concentrations of Fe 3 O 4 @C, CMC, aluminum chloride (AlCl 3 ), and chitosan on the swelling process of composite beads, DS loading, and controlled release behavior was systematically studied. DS encapsulation efficiency in Fe 3 O 4 @C/CMC/chitosan beads reached 70.8 ± 0.65% at concentrations of 0.1% Fe 3 O 4 @C, 3% CMC, 3% AlCl 3, and 1% chitosan. The beads showed a higher swelling index in phosphate buffer at pH 7.4 and 6.8 than at pH 1.2. The composite beads revealed excellent pH-sensitive in vitro drug release profiles and prevented burst release in the gastrointestinal tract.
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JOURNAL OF MOLECULAR LIQUIDS
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2019
·
IF 4.561
Shuting Zhuang,Jianlong Wang
Radiocesium is a major fission product that has negative effects on ecosystems and human health due to its radioactivity and chemical toxicity. Metal hexacyanoferrates (MHCF), as efficient adsorbent for cesium removal has aroused great interest because of their high selectivity and adsorption capacity for cesium ions. In this study, a novel biosorbent, sodium nickel hexacyanoferrates-loaded bacterial cellulose membrane (BC/NiHCF), was prepared by loading NiHCF in porous and shape controllable bacterial cellulose (BC). The as-prepared biosorbent presented porosity, flexibility, and good stability in aqueous solutions, and showed a good adsorptive removal capacity for cesium ions . The effect of experimental conditions (e.g. contact time and initial cesium ion concentration) on the uptake of Cs + was examined. For adsorption kinetics , the data was best described by the pseudo-second-order model with R 2 = 0.998; for adsorption isotherms , the data could be efficiently modelled by the Langmuir model (R 2 = 0.9715). Meanwhile, its maximum adsorption capacity was estimated to be 175.44 mg g −1 , indicating the showcase adsorbent was efficient for Cs + removal. Additionally, the adsorption mechanism was tentatively proposed. In a word, BC/NiHCF exhibited great adsorption performance towards Cs + .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Siqi Huang,Linjun Wu,Tianzhang Li,Danyuan Xu,Xuliang Lin,Chuande Wu
The severe preparation process, poor swelling properties and mechanical properties of traditional cellulose and polyvinyl alcohol (PVA) composite hydrogels heavily limited their practical applications. To solve these issues, we use long-chain hydroxyethyl celluloses (HECs) as framework backbones, short-chain PVAs as branched chains, lignin molecules as extended crosslinkers and epichlorohydrin molecules as crosslinkers to prepare the lignin-based hydroxyethyl cellulose-PVA (LCP) super-absorbent hydrogels in the alkaline aqueous solution under mild reaction conditions, demonstrating high swelling ratio of up to 1220 g/g. The LCP hydrogels could take up large amounts of positively charged dyes rhodamine 6G, crystal violet and methylene blue with uptakes of 153, 184 and 196 mg/g, respectively. The LCP super-absorbent hydrogels also present excellent water retention, biodegradability and excellent swelling properties, which are very promising for applications in the fields of commercial diapers, soil water retention and seed cultivation in agriculture, and dye pollutant removal.
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CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Hai-Mu Ye,Cai-Shui Wang,Zi-Zhe Zhang,Shu-Fang Yao
Cellulose nanocrystals (CNCs) are nature-resourced nanoparticles and have been widely used to improve performance of biodegradable polyesters. Two types of CNCs respectively prepared by sulphuric acid hydrolysis ( a CNCs) and ammonium persulfate oxidation ( o CNCs) processes were incorporated into poly(butylene adipate) (PBA) matrix to regulate its crystallization behavior and enzymatic degradation performance. Thermal and X-ray diffraction analysis revealed that both a CNCs and o CNCs could promote the crystallization ability and lamellar thickening of α-form PBA, while o CNCs showed stronger promotion than a CNCs. Optical morphology study indicated that both two types of CNCs enhanced the nucleation ability of PBA. Furthermore, the mechanism of crystallization promotion of CNCs on PBA was further discussed and attributed to the “memory effect” in the melt state of PBA/CNCs composites, which was originated from the hydrogen-bonding interaction between CNCs and PBA chains. The enzymatic degradation testing proved that CNCs could slower down degradation rate of PBA and PBA/ o CNCs composites possessed lower degradation rate than PBA/ a CNCs composites.
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FOOD HYDROCOLLOIDS
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2020
·
IF 7.053
Xiangwei Zhu,Fuchao Zhan,Youlong Zhao,Yu Han,Xiaoqiang Chen,Bin Li
Proteins and their poly-complex/conjugates are well known to produce and stabilize foams due to the intrinsic amphiphilicity, tunable microstructures and surface adsorption behaviors. However, in-situ observations and in-depth understanding to their bulk, foaming and interfacial behaviors remain less charted especially when proteins are assembled in the multi-component food matrices. In this study, we reported that the carboxymethyl cellulose (CMC) represents an economic candidate to significantly enhance the foaming properties of sodium caseinate (SC) and its binary complex (sodium caseinate-tannic acid, SC/TA). The obtained complex (both SC/CMC and SC/TA/CMC) showed increased foam-ability, foam stabilities and reduced bubble sizes. In terms of the interfacial behaviors, micro-rheological test and dynamic interfacial data revealed that SC/TA/CMC foaming system exhibited viscous bulk phase, formation of elastic interface and more importantly the enhanced surface activity. To further investigate their nonlinear surface rheological characteristics , the large-amplitude oscillatory dilatational rheology was used, in which the surface dilatational modulus of SC/TA increased as CMC was added. More than providing a high-performance food surfactant , our study manifests that complex formed between polyphenols, proteins, and polysaccharides can be a viable platform to understand and design novel foaming agents in the food industry.
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REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Chenjie Li,Yulin Ding,Wei Xu,Minyu Li,Wenmu Li
Introducing CO 2 affinity additives into membrane is one of significant approaches to improve the CO 2 permeability of membranes for natural gas sweetening. In current work, high performance mixed-matrix membranes were successfully obtained using the cellulose acetate (CA) and the zeolitic tetrazolate-imidazolate frameworks (ZTIFs) with highly CO 2 affinity as matrix and additive respectively. The interaction between CA matrix and ZTIFs was verified by the FT-IR. The SEM, EDS and XRD were used to evaluate the morphology properties of these membranes. The CO 2 permeability of CA/ZTIFs mixed-matrix membranes which is closely correlated to the loading of high CO 2 affinity ZTIF additive were in a range of 9.59–15.85 Barrer, implying the indispensable role of the ZTIF additive in changing the CO 2 dissolution and diffusion behavior inside the membranes. The ideal compatibility and gas selectivity proved the great potential of the ZTIFs additives for the gas separation application.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 12
·51827
·
IF 3.125
Yuan Li,Lu Zhang,Fayong Li,Ke Wang,Xiaoru Wu,Hailu Liu,Bibo Long,Yang Zhao,Dong Xie,Junjia Chen
The hydrophobic modification of cellulose nanofibers (CNF) was carried out via free radical polymerization using methyl methacrylate (MMA) as the monomer to improve the compatibility between CNF and poly lactic acid (PLA). Followed by the preparation of the novel nanocomposites in combination of the organic montmorillonite and the substrate. The resulting nanocomposites were then coated on paper surface using a cast-coating process in an attempt to improve the barrier properties towards water vapor and oxygen. In addition, the composite films are prepared via a solution casting method. The water vapor transmission rate (WVTR), water vapor permeability (WVP), oxygen transmission rate (OTR), and tensile strength of the as-prepared films were systematically measured. The corresponding results demonstrated that the WVTR, WVP and OTR decreased with the addition of a certain content of MCNF in coatings. 0.2 wt% MCNF is the optimum content, showing the best gas resistance and tensile performance. The lowest value of WVTR and WVP are 10.30 g/(m 2 ⋯24 h) and 3306.58 g⋯μm/(m 2 ⋯24 h) for films with 0.2 wt% MCNF added, which is 88.23% and 26.05% lower than that of PLA composite film without NFC.
研究领域:
高分子材料
·
纳米复合材料
·
包装材料
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表面涂层
·
生物基材料
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高影响因子
CARBOHYDRATE POLYMERS
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2020
·
IF 7.182
Shenjie Han,Shaoyi Lyu,Zhilin Chen,Feng Fu,Siqun Wang
Cellulose nanocrystals (CNCs) combined with styrene-maleic anhydride (SMA) as stabilizers were used to stabilize paraffin droplets for fabricating paraffin/melamine-urea-formaldehyde (MUF) microcapsules. Effects of mixed emulsifier of CNCs and SMA on the morphologies, chemical structures, and properties of paraffin/MUF microcapsules were characterized by Field emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analyzer (TGA), differential scanning calorimetry (DSC), and paraffin leakage rate test. The results showed that using CNCs alone as emulsifier did not work in manufacturing paraffin/MUF microcapsules, but mixed emulsifier of CNCs and SMA was suitable. When CNCs and SMA each account for 50 % of the mixed stabilizer, the phase change latent heat values of melting and crystallization of MicroC5S5 were about 123.6 J/g and 118.4 J/g, respectively. This demonstrates that CNCs can be mixed with SMA to stabilize paraffin droplets in situ polymerization and reduce the need for surfactants.
研究领域:
材料科学
·
高分子化学
·
纳米技术
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Kai Wu,Luping Yu,Chuxin Lei,Jiexin Huang,Dingyao Liu,Yang Liu,Yangsu Xie,Feng Chen,Qiang Fu
Personal cooling technology using functional clothing that could provide localized thermal regulation instead of cooling the entire space is regarded as a highly anticipated strategy to not only facilitate thermal comfort and human health but also be energy-saving and low-cost. The challenge is how to endow textiles with prominent cooling effect whenever the wearer is motionless or sportive. In this study, high content of edge-selective hydroxylated boron nitride nanosheets (BNNSs) up to 60 wt % was added into a biodegradable cellulose/alkaline/urea aqueous solution, and then regenerated cellulose (RCF)/BNNS multifilaments were successfully spun in a simple, low-cost, and environmentally friendly process, which was demonstrated to serve as both static and dynamic personal cooling textile. Typically, excellent axial thermal conductivity of RCF/BNNS filament rendered that body-generated heat could directly escape from skin to the outside surface of the textile by means of thermal conduction, achieving a much better static personal cooling result through continuous thermal radiation. Besides, synergistic effect between excellent heat dissipation capability and good hygroscopicity also resulted in much better dynamic cooling effect once the wearer is doing some sports, whose efficiency was even better than commercial hygroscopic textiles such as cotton and RCF.
研究领域:
材料科学
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纺织工程
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热管理
·
可持续技术
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高影响因子
ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Zhaodong Zhu,Shiyu Fu,Lucian A. Lucia
Microparticle annular structures resembling “donuts” were obtained from spray drying of cellulose nanocrystal suspensions by addition of lignin. The formation of the donut and its accompanying pit were from the hydrophobicity of lignin that increased water evaporation kinetics during spray drying and decreased ability of water storage inside the microparticles. Indeed, the water inside the microsphere burst the center of the microsphere as verified by fluorescence imaging in which lignin was demonstrated to be concentrated in the center of the annular microsphere; although it was distributed throughout the microsphere, water on the surface of the hydrophobic lignin evaporated faster than on the surface of cellulose nanocrystals (CNC) so that the solid lignin shrank faster than CNC during material aggregation and preferentially concentrated in the center of the microparticle. The particles were modified with a hydrophobic agent, methyltrimethoxysilane (MTMS) and mixed with polydimethylsiloxane (PDMS) to prepare superhydrophobic coatings that greatly depended on the dosage of lignin during particle preparation.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
胶体与界面化学
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Fibers
·
2026
·Vol. 14
·期 1
·9
·
IF 3.9
Nikita A. Shutskiy,Aleksandr R. Shevchenko,Ksenia A. Mayorova,Leonid L. Shagrov,Andrey S. Aksenov
HighlightsWhat are the main findings?Cellulose cryogels and aerogels are promising smart hemostatic materialsPhysicochemical and mechanical properties are connected with in vitro testsIn vivo studies are essential to highly porous cellulose-based scaffolds in biomedicineWhat are the implications of the main findings?When producing cellulose cryogels and aerogels with optimal hemostatic properties, it is necessary to meet several criteria simultaneously. These include both the properties of the new smart materials themselves and their ability to interact with blood and tissues in living organisms.A promising application of smart materials based on natural polymers is the potential to solve problems related to hemostasis in cases of severe bleeding caused by injury or surgery. This can be a life-threatening situation. Cellulose and its modified derivatives represent one of the most promising sources for creating effective hemostatic systems, as well as for various sensing applications related to disease detection, infection diagnosis, chronic condition monitoring, and blood analysis. The aim of this review was to identify key criteria for the efficiency of cellulose-based gels with hemostatic activity. Experimental studies aimed at evaluating new hemostatic devices were analyzed based on international sources using the PRISMA methodology. A total of 111 publications were identified. Following the identification and screening stages, 20 articles were selected for the final qualitative synthesis. The analyzed publications include experimental studies focused on the development and analysis of highly porous cellulose-based scaffolds in the form of aerogels and cryogels. The type and origin of cellulose, as well as the influence of additional components and synthesis conditions on gel formation, were investigated. Three major groups of key criteria that should be considered when developing new cellulose-based highly porous scaffolds with hemostatic functionality were identified: (I) physicochemical and mechanical properties (pore size distribution, compressive strength, and presence of functional groups); (II) in vitro tests (blood clotting index, red blood cell adhesion rate, hemolysis, cytocompatibility, and antibacterial activity); (III) in vivo hemostatic efficiency (hemostasis time and blood loss) in compliance with the 3Rs policy (replacement, reduction, refinement). The prospects for the development of highly porous cellulose-based scaffolds are not only focused on their hemostatic properties, but also on the development of smart platforms.
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