CLAYS AND CLAY MINERALS
·
2021
·Vol. 69
·期 6
·759-771
·
IF 1.609
Yu Wei Hua,Liu Jia Hui,Wang Min,Li Na,Zhang Jun Rui,Huang Tian Hao,Zhou Chun Hui
Organo-montmorillonite (OMnt) has wide applications in paints, clay-polymer nanocomposites, biomaterials, etc. In most cases, the dispersibility and swellability of OMnt dictate the performance of OMnt in the target products. Previous studies have revealed that the properties can be improved when multiple organic species are co-introduced into the interlayer space of montmorillonite (Mnt). In the present study, single surfactant erucylamide (EA), dual-surfactants cetyltrimethyl ammonium bromide (CTAB) and octadecyltrimethyl ammonium chloride (OTAC), and ternary-surfactants EA, CTAB, and OTAC were co-introduced into Mnt by solution intercalation. The resulting OMnts were characterized by powder X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, thermogravimetry-differential thermogravimetry (TG-DTG), water contact-angle tests, scanning electronic microscopy (SEM), laser particle-size analysis, and swelling indices. Mnt co-modified by ternary CTAB, OTAC, and EA led to a large d 001 value (4.20 nm), surface hydrophobicity with a contact angle of 95.6°, swellability (50 mL/g) with small average particle sizes (2.1−2.8 μm) in xylene, and >99% of the OMnt particles were kept as <5 μm in deionized water. The formation of EA-modified-Mnt was proposed according to hydrophobic affinity, hydrogen bonding, and van der Waals forces. The nanoplatelets of the CTA + , OTA + , and EA co-modified OMnts in xylene were assembled into a house-of-cards structure by face-to-edge and edge-to-edge associations. The electrostatic attractions, electrostatic and steric repulsions, and hydrophobic interactions were responsible for the good dispersibility of OMnt in xylene. The ternary surfactant co-modified OMnt with high dispersion and swellability will make OMnt better suited for real-world applications.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Jinni Luo,Huanxia Wang,Jinfei Wang,Yuan Chen,Chenglong Li,Kejun Zhong,Jie Xiang,Pengxiang Jia
Conductive hydrogels have been in huge demand in biomedical and wearable electronics. However, the application of traditional conductive hydrogels is largely limited due to their poor mechanical properties. Here, a conductive hydrogel with excellent mechanical strength and swelling resistance properties is prepared by ion cross-linking, directional freeze-drying, and rehydration. First, the acrylamide and acrylic acid are polymerized in the κ-carrageenan solution to form the hydrogel. Then, the obtained hydrogel is cross-linked with Fe3+ by soaking in ferric chloride solution. Finally, the ionic cross-linked hydrogels are reinforced by directional freeze-drying and rehydration. The resulting hydrogel has excellent tensile strength (5.67 MPa) and high toughness (7.63 MJ/m3). It is worth noting that the hydrogel also had excellent anti-swelling properties. Its mechanical strength and volume almost show no changes after soaking in deionized water for 40 days. In addition, the hydrogel exhibits good ionic conductivity (0.091 S/m), high sensitivity, and excellent stability when applied as a strain sensor. This work proposes a simple method to fabricate a conductive hydrogel with great mechanical properties and swelling resistance, which displays huge potential in varied fields.
研究领域:
生物医学工程
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材料科学
·
可穿戴设备
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DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Sijia Chen,Junyi Tang,Jiachun Feng
The development of high-performance hydrogels has received much attention, but the simple and cost-effective preparation of hydrogels with high mechanical strength and excellent swelling resistance remains a challenge. In this study, a facile and green strategy was proposed to construct a polyvinyl alcohol/chitosan-based (PVA/CS-based) hydrogel with high mechanical strength and superior swelling resistance. By introducing tannic acid (TA), a natural polyphenol, and forming hydrogen bonding cross-linking with the polymer chains through solvent regulation, as well as by ionic cross-linking and salting-out effects further induced through sodium citrate solution immersion, a strong and homogeneous multiple physical cross-linking network was formed, which endowed the resulting hydrogel with excellent mechanical and swelling resistance performance. For the hydrogel with PVA, CS, and TA in the mass ratio of 5:1:5, the tensile strength was up to 8.22 MPa, and the tensile strength retention was up to 96% of the original value after swelling equilibrium. In addition, our hydrogel can be attached in situ to various substrates and enabled wet adhesion. The easy scale-up and energy-saving features made our method highly promising for the preparation of high-performance hydrogels for many advanced applications.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·
IF 3
Ao Nan Lai,Shu Chun Li,Pei Zhi Zheng,Shu Feng Zhou,Shi Jie Wu
A well-designed architecture is presented here to construct high-performance anion exchange membranes (AEMs). A series of quaternized fluorene-containing block poly(arylene ether sulfone ketone)s (QFPESK-m-n) is synthesized as the main chains, and grafted with comb-shaped C8 long alkyl chains for the AEMs. By varying the hydrophilic segment’ length, there has been a significant change in the microstructure as well as phase separation morphology of the membranes, as confirmed by atomic force microscopy. Hence the as-prepared AEMs with moderate ion exchange capacities (IECs) show enhanced hydroxide conductivities in the range of 28.8―94.7 mS⋅cm −1 from 30 to 80°C. Furthermore, based on the block backbones and hydrophobic comb-shaped alkyl chains, the AEMs show low-level swelling ratios of 4.3% to 9.2% at 30°C and from 6.2% to 13.2% at 80°C, and superior ratios of conductivity to swelling. In addition, the QFPESK-m-n AEMs also depict acceptable mechanical properties, good thermal stability and an optimizable alkaline stability.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 38
·12981-12991
·
IF 6.4
Yue Cai,Kaizhen Wan,Qihui Chen,Maochun Hong,Zhao-Xi Zhou,Heqing Fu
When hydrogels are in environments with high water content, they usually undergo swelling, leading to a degradation of mechanical properties, which severely limits their application in underwater sensing. To solve this problem, we synthesized an anti-swelling, tough, double-crosslinked, dual-network hydrogel, P(AA-SMA)-CMC-Na, for underwater sensing. Due to the hydrophobic association and electrostatic interactions between the cationic surfactant N-Hexadecyltrimethylammonium chloride (CTAC) and poly (acrylate-methacrylate octadecyl ester) [P(AA-SMA)], as well as the dense network structure brought about by double cross-linking and the incorporation of CMC-Na, the hydrogel has excellent anti-swelling properties and mechanical properties (large stretchability of 955%, tensile strength of 252 kPa). Notably, after seven days of immersion in water (pH = 3, 5) and saline, stress and strain were elevated compared to the original hydrogel (strain up to 1460% and stress up to 805 kPa after immersion). The dynamic hydrophobic association of CTAC with SMA and the large number of hydrogen bonds within the hydrogel contributed to the excellent self-healing efficiency of the hydrogel (90%). The hydrogel was fabricated into a flexible strain sensor that showed keen sensitivity in the sensing range of 0–400% (GF values of 1.55, 2.87, and 5.03 for the ranges of 0–200%, 200–300% and 300–400%, respectively). It could accurately detect real-time signals of human movement in air, underwater, and seawater. Therefore, the P(AA-SMA)-CMC-Na hydrogel can meet the needs of underwater sensing and have great potential for applications in electronic skin, personal health detection, and flexible wearable electronics.
研究领域:
材料科学
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生物医学工程
·
传感器技术
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yong Deng,Panpan Li,Yudong Lian,Zhaoguang Nie,Quan Ji,Xiaomei Ma
The rising energy and environmental crisis brought by extensive usage of disposable synthetic plastic packaging necessitates the pursuit of ecofriendly packaging materials. Herein, a novel type of biofilms from exopolysaccharide gellan gum (GG) were developed through successive sol-gel transition, hydroalcoholic pretreatment and ionic anchoring before air-drying. Universal electronic testing machine, gravimetry, contact angle meter and UV–visible spectrophotometer were employed to investigate the mechanics, swelling-resistance, surface hydrophobicity and barrier property. The results indicate hydroalcoholic pretreatment ameliorates the toughness of GG films, with the breakage elongation and tensile toughness reaching ~17 % and 9.44 MJ/m 3 . Metal-ion anchoring bestows swelling-resistance and surface hydrophobicity to GG films. The equilibrium swelling ratio after Fe 3+ -anchoring dropped to ~150 % in water, in stark contrast with the measurable swelling ratio of those unanchored beyond 2700 % which were followed by loss of dimensional integrity. The surface hydrophobicity is improved significantly with the water contact angle enlarged from 48° to 77° after Fe 3+ -anchoring. Metal-ion anchoring also improves the water vapor barrier performance, and notably Cu 2+ /Fe 3+ -anchoring endows UV light-shielding ability to GG films. The prominent performance along with the environmental friendliness of GG is conducive for future application in single-use packaging materials.
研究领域:
材料科学
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环境科学
·
食品科学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Yanqing Xu,Suyang Yu,Guibin Peng,Arcadio Sotto,Huimin Ruan,Jiangnan Shen,Congjie Gao
Organic solvent nanofiltration (OSN) membranes have gained increasing attention for their wide applications in organic phase system. However, the fabrication method rather than the swelling behavior receives more attention during the OSN testing. In this work, a thin-film composite membrane with an internal cross-linking network by reacting 4,4-bipyridine with brominated poly (2,6-dimethyl-1, 4-phenylene oxide) (BPPO) has been prepared for organic solvent nanofiltration (OSN). The bipyridine groups substituted on the polyphenylene oxide polymer backbone act as cross-linkers and cationic channels for remarkable chemical stability and high solvent permeability. The permeability of the cross-linked BPPO (CBPPO) thin-film membranes exhibited high related to the viscosity and solubility parameter of solvents. The stability of CBPPO membrane was studied via various organic solvent immersing experiments. The result demonstrated that the composite membrane swelling changed to an extent of no more than 2.01%. It can be attributed to the low conformational flexibility of polymer chains with a high crosslinking degree. The ethanol permeation and dye rejection were compared before and after soaking. The calculation of the MWCO and membrane potential of modified CBPPO membranes showed that the swelling behavior of the CBPPO composite membranes is mainly affected by the membrane charge densities rather than the pore size.
研究领域:
材料科学
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膜技术
·
化学工程
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产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Zhiyun Li,Huilong Xu,Xinxin Xia,Yihu Song,Qiang Zheng
Mullins effect of carbon black filled nitrile butadiene rubber compounds and vulcanizates during cyclic tensile deformation is investigated and the influences of thermal annealing of the stretched samples, the deformation velocity and history and the solvent swelling are discussed. The energy losses associated with recovery hysteresis and softening accompanying the Mullins effect at a given crosshead velocity are quantitatively analyzed. The results show that the recovery hysteresis involves in microscopic deformation of the rubber phase in the nanocomposites but it disappears in the swollen samples. On the other hand, the softening is associated with both the rubber and filler phases; its energy loss increases with increasing filler content and decreases significantly by swelling. Furthermore, the softening of samples stretched at room temperatures is recoverable after conditioning at 80 °C but the recovery is retarded significantly by filler. The investigation allows gaining recognition of the important role played by the viscoelastic rubber matrix and the influence of the filler.
研究领域:
材料科学
·
高分子科学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2012
·
IF 3.628
Guanghua He,Zi Wang,Hua Zheng,Yihua Yin,Xiong Xiong,Rongye Lin
Aminoethyl chitins (AEC) with different amino contents were synthesized from chitin and 2-chlorethylamine hydrochloride, and the AEC hydrogels were prepared by crosslinking with glutaraldehyde. The microstructures, swelling behaviors and antibacterial activities of the hydrogels were investigated. The results of Fourier transform infrared spectroscopy (FTIR), 1 H nuclear magnetic resonance ( 1 H NMR) spectrum and scanning electron microscopy (SEM) showed that the hydrogels were prepared by forming the Schiff base from AEC and glutaraldehyde. The aminoethyl chitin hydrogels were sensitive to acidic environment. The swelling ratio changed with the amino content of AEC, declined with the increase of the crosslinking agent concentration and increased with the increase of the AEC concentration. In addition, the antibacterial results of the hydrogels against Staphylococcus aureus ( S. aureus ) indicated that the hydrogels had good antibacterial activities, and the antibacterial properties were affected by the amino content of AEC and the crosslinking agent concentration.
研究领域:
生物材料学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Marine Drugs
·
2017
·Vol. 15
·期 4
·91
·
IF 3.503
Zongrui Tong,Yu Chen,Yang Liu,Li Tong,Jiamian Chu,Kecen Xiao,Zhiyu Zhou,Wenbo Dong,Xingwu Chu
Alginate (Alg) is a renewable polymer with excellent hemostatic properties and biocapability and is widely used for hemostatic wound dressing. However, the swelling properties of alginate-based wound dressings need to be promoted to meet the requirements of wider application. Poly(γ-glutamic acid) (PGA) is a natural polymer with high hydrophility. In the current study, novel Alg/PGA composite microparticles with double network structure were prepared by the emulsification/internal gelation method. It was found from the structure characterization that a double network structure was formed in the composite microparticles due to the ion chelation interaction between Ca2+and the carboxylate groups of Alg and PGA and the electrostatic interaction between the secondary amine group of PGA and the carboxylate groups of Alg and PGA. The swelling behavior of the composite microparticles was significantly improved due to the high hydrophility of PGA. Influences of the preparing conditions on the swelling behavior of the composites were investigated. The porous microparticles could be formed while compositing of PGA. Thermal stability was studied by thermogravimetric analysis method. Moreover, in vitro cytocompatibility test of microparticles exhibited good biocompatibility with L929 cells. All results indicated that such Alg/PGA composite microparticles are a promising candidate in the field of wound dressing for hemostasis or rapid removal of exudates.Keywords:alginate;poly(γ-glutamic acid);emulsification/internal gelation method;microparticle;swelling behavior
研究领域:
生物材料学
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医学工程
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产品关联
DOI
PubMed
高影响因子
QUIMICA NOVA
·
2022
·Vol. 45
·期 2
·145-151
·
IF 1.145
Sun Fei,Feng Chao,Wang Yang,Yang Xue,Zhao Hong
The fluorescent microspheres are prepared by the swelling-evaporation method. The optimal swelling conditions are obtained by researching related factors, such as types and dosages of swelling agent, dosages of fluorescent substance, swelling time and swelling temperature. Considering that the structure of microspheres can influence the swelling properties, the paper mainly focuses on the effect of molecular weight and surface carboxyl group content of polystyrene microspheres on swelling properties. When the molecular weight of microspheres is 75276 g mol-1, the density of carboxyl group on their surface is 6.94×10-4 mol g-1, and the doping amount of europium complex reaches the maximum of 24.9 mg g-1 with the strongest fluorescence intensity. Meanwhile, the as-prepared fluorescent microspheres have high monodispersity, uniform particles size and high thermal stability (the decomposition temperature is 385oC), which sets up the good foundation for biomolecule detection. So, this work provides a significant experience for the preparation of fluorescent microspheres.
研究领域:
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Zhijie Zhao,Xuzhe Qin,Lilong Cao,Junjie Li,Yuping Wei
Existing anti-swelling hydrogels with poor mechanical strength restrict their underwater human monitoring as wearable electronic sensing equipment. Herein, a nonswelling double network (DN) hydrogel with strong self-recoverability (97.22%) was developed by adding chitosan (CS) to poly(acrylic acid-2-methoxyethyl acrylate)-Fe 3+ [P(AA-MEA)-Fe] network. Owing to the introduction of CS, the hydrogel displayed excellent nonswelling properties under aqueous solutions (pH = 1, 4 and 7), physiological saline, seawater, dodecane, n-hexane and chloroform. Besides, CS improved mechanical properties of hydrogel through non-covalent network (large stretchability of 1199%, tensile strength of 0.462 MPa and toughness of 2.01 MJ/m 3 ). Surprisingly, the hydrogel still reached the extensibility (1072%) and tensile stress (0.467 MPa) even after immersing in water for 7 days. Fabricating hydrogel as flexible strain sensor, periodic real-time signals of human movements (e.g., joint actions and electronic skin touching) were accurately monitored under the water and seawater. The nonswelling P(AA-MEA)-CS-Fe hydrogel shows huge potential in underwater sensing.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）