Applied Sciences-Basel
·
2022
·Vol. 12
·期 23
·12062
·
IF 2.838
Hua Yan,Lifan Wu,Pingyang Li,Xuan Li,Junxin Zhao,Xiaomin Dong
In this paper, magnetorheological (MR) porous fabric composites were prepared by using non-woven fabrics pretreated with lithium stearate. Due to the porous structure of non-woven fabric and the good stability of lithium stearate, the mechanical properties and sedimentation stability of the composite have been improved. The viscosity, shear stress and dynamic viscoelasticity of different samples were analyzed by rheological properties tests. The results indicate that the mechanical properties of the composite samples containing lithium stearate are improved compared with the MRF (magnetorheological fluid) sample, and its sedimentation stability under non-working conditions is also improved. However, with the increase of lithium stearate content, the improving effect of material performance gradually decreased. The experimental results show that when the magnetic flux density is 0.31 T, the shear stress of the MR porous fabric composite with 1 wt% lithium stearate is about 27 kPa, which increases by 51.1% compared with the MRF sample.Keywords:magnetorheological fluid;rheological properties;composite;pretreatment
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
RHEOLOGICA ACTA
·
2024
·
IF 2.3
Sun Li,Wang Geng,Zhang Chunwei,Liang Tianqi
We have found that the unique particle properties of fly ash can be applied to the modification of shear thickening fluid. In this paper, rheological properties and microscopic thickening mechanism of fly ash/silicon-based shear thickening fluid (subsequently abbreviated as FA/SiO 2 -STF) are studied. Ultrasonic technology and mechanical stirring method were used to prepare FA/SiO 2 -STF with different mass fractions of fly ash, and then rheometer was used to carry out steady-state rheological testing for FA/SiO 2 -STF, and 4%FA/SiO 2 -STF dynamic rheological test and temperature sensitivity testing, respectively. The thickening mechanism of FA/SiO 2 -STF was analyzed by scanning electron microscope. The rheological test results show that the FA/SiO 2 -STF with 4% fly ash content exhibits remarkable shear thickening effect. Finally, the relationship between the viscosity and shear rate of FA/SiO 2 -STF is numerically described by a mathematical model, which can accurately reflect the viscosity thickening effect.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.701
Kai Zheng,Yilin Deng,Hui Cao
To improve the properties of xanthan gum (XG), 3-chloro-2-hydroxypropyltrimethylammonium chloride and propylene oxide were used as modifiers to etherify XG and to obtain cationic hydroxypropyl xanthan gum (HCXG), and cationic hydroxypropyl xanthan gum (CHCXG), further optimized by super-gravity reaction. The structure of the product was characterized by infrared spectroscopy and nuclear magnetic resonance. The rheological properties of XG, HCXG, and CHCXG solutions and their performance as fracturing fluids were studied. Infrared and nuclear magnetic test results showed that the cationic etherification agent and hydroxypropyl group were successfully connected to XG, and the degree of substitution of CHCXG was higher. The rheological properties of the CHCXG solution and the performance of the fracturing fluid base fluid were superior to those of the XG and HCXG solutions. The viscosity of the solution after the super-gravity modification was further increased, and the apparent viscosity of the 0.4% CHCXG solution was 28.96% higher than that of the HCXG solution. After XG modification, the solution strength, yield stress, viscoelasticity, temperature resistance, and shear resistance were all significantly improved. The rheological properties of the HCXG solution and the performance of the fracturing fluid base fluid are good and can be used for fracturing fluid thickener.
研究领域:
生物化学
·
材料科学
·
石油工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2017
·
IF 3.684
Zhukang Du,Feng Wang,Xueyi Chang,Jun Peng,Biye Ren
Percec-type substituted benzyl alcohol mini-dendrons as new hydrophobic end-cappers can effectively improve the thickening performance of hydrophobically modified ethoxylated urethanes (HEURs) in aqueous solution. To demonstrate the effects of substituted structure of Percec-type mini-dendritic end groups on aggregation and rheological properties of HEURs in aqueous solution and latex, three model HEURs end-functionalized by mono-, di- and tri-substituted benzyl alcohol mini-dendrons were synthesized, respectively. For a reasonable comparison, the total carbon number of substituted alkyl tails is set to be 24 for the three mini-dendritic end groups: HOCH 2 - Ph -C 24 H 49 ( C24 ), HOCH 2 - Ph -(C 12 H 25 ) 2 ( 2C12 ) and HOCH 2 - Ph -(C 8 H 17 ) 3 ( 3C8 ), which respectively correspond to single-, two- and three-tail according to their substituted degrees. Interestingly, rheological properties of these HEURs in aqueous solution and latex significantly depend on the substituted degree of mini-dendritic hydrophobes. The high-substituted mini-dendritic hydrophobes help HEURs to form a strong physical network with high thickening performance and fast relaxation in both aqueous solution and latex, because shorter alkyl tails in high-substituted dendritic hydrophobes will lead to a smaller aggregation number and a lower rheological activation energy . This work not only provides new insights into the connection of networks in solutions of mini-dendron functionalized HEURs but also offers a new approach to preparation of high performance thickeners used in water-borne systems.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2022
·Vol. 9
·期 6
·065307
·
IF 2.025
Wenpeng Chu,Song Yan,Ziqing Cai,Shiwen Yang,Xinghui Hu,Xianze Yin
The inherent brittleness of poly(lactic acid) (PLA) usually limits its application in the high ductile requirements sector. To address the above issue, n-ethyl-p-toluenesulfonamide (N-PTSA) as the toughening agent, was utilized to optimize the rheological and mechanical performance of the PLA matrix. The microstructure, thermal stability, rheological behavior, and mechanical properties of PLA/N-PTSA were systematically investigated. A rheological test showed that N-PTSA can reduce the melt processing viscosity of PLA matrix and the decreasing of processing viscosity strongly depended on the N-PTSA content rather than shear rate. Mechanical properties results confirmed that the 14.7% N-PTSA can improve the toughness of PLA/N-PTSA without deteriorating the tensile strength and Yong's modulus. This reason was ascribed to the reduction of hydrogen bonds of PLA matrix caused by N-PTSA to accelerate the movement of PLA molecular chain meanwhile forming new hydrogen bond between PLA and N-PTSA. By adding N-PTSA, the thermal stability of PLA was decreased. With the synergistic effect of plasticizing and toughening N-PTSA, the rheology and mechanical properties of PLA had been effectively improved.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 305
·期 10
·2000343
·
IF 3.853
Qingsen Gao,Mingjie Feng,En Li,Chuntai Liu,Changyu Shen,Xianhu Liu
In this work, a novel nanocomposite is prepared via a melt blending of thermoplastic polyurethane (TPU) and Ti 3 C 2 T x MXene nanosheets pretreated with polyethylene glycol. It is found that the tensile strength and elongation at break increased by 41.2% and 15.4% at MXene loading values of 0.5 wt%. The addition of MXene slightly increases the crystalline speed of TPU, and effectively hinders the transfer of small gas molecules at high temperatures. The storage modulus, loss modulus, and complex viscosity of TPU nanocomposites increase with the increasing MXene content at low frequency. The results demonstrate that the mechanical, thermal, and rheological properties of TPU nanocomposites can be effectively improved by MXene nanomaterials.
研究领域:
材料科学
·
聚合物工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2019
·Vol. 61
·期 3
·317-324
·
IF 0.984
Ting Gu,Zhu Dayong,Lu Yue,Lu Shengjun
Abstract Polylactic acid (PLA) and poly(butylene adipate- co -terephthalate) (PBAT) were blended in a twin-screw extruder with a compatibilizer of PLA grafted using glycidyl methacrylate (PLA- g -GMA), providing PLA- g -GMA/PLA/PBAT composites. The chemical structures of the composites were determined using Fourier-transform infrared spectroscopy (FTIR). The effects of the PLA- g -GMA amount on the thermal properties, rheological performance, and mechanical behavior of the composites were studied through differential scanning calorimetry (DSC) using an advanced rheometer and material testing machine. The results revealed that the reaction between the PLA/PBAT and epoxy groups within the PLA- g -GMA promotes an entanglement between molecular chains, which increases the glass transition temperature T g , cold crystallization temperature T c , and melting temperature T m of the samples. Moreover, the PLA- g -GMA/PLA/PBAT composites show higher tensile and notch impact strengths than PLA/PBAT.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2016
·
IF 5.554
Zhukang Du,Biye Ren,Xueyi Chang,Renfeng Dong,Jun Peng,Zhen Tong
Hydrophobically modified ethoxylated urethanes (HEURs) belong to an important class of telechelic associative polymers for improving solution rheological properties. We designed and prepared a novel azobenzene end-functionalized HEUR polymer (AzoHEUR), which was used to investigate the effects of hydrophobicity change of end hydrophobes induced by photoisomerization of azobenzene on the solution aggregation and rheological properties. The concentrated AzoHEUR solutions show a reversible rheological property change upon alternative exposure to UV and visible light. We have demonstrated that a reversible change in hydrophilic–lipophilic balance of polymer followed by photoisomerization of azobenzene induces a reversible rearrangement of micellar junctions through loop–bridge or bridge–loop transitions, which reversibly changes not only the network connectivity but also the solution relaxation behavior. Moreover, a structural model is proposed to describe the rearrangement of micellar junctions induced by photoisomerization of azobenzene. The work will not only provide new insights into the effect of hydrophobicity change of stimuli-responsive end groups on the aggregation and rheological behavior of HEUR aqueous solutions but also open a new perspective for development of some special applications of HEURs in fabrication and transmission of soft materials, medicines, cosmetics, inks for inkjet printers, and flow rate controlling systems.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 15
·5351
·
IF 3.748
Jinyi Wu,Quantao Liu,Shaopeng Wu
Cracks are inevitable during the service life of asphalt pavement and the water at the fracture surfaces tends to cause the grouting materials to fail. Studies have shown that the catechol groups in adhesion proteins secreted by mussels can produce strong adhesion performance in the water. In this paper, the mussel-like adhesive L-Dopa Methacrylic anhydride (L-DMA) was prepared based on the concept of bionic design and used to improve the properties of asphalt. By using Fourier-transform infrared spectroscopy (FTIR) and Thermogravimetric analysis (TGA), the thermal stability and structural composition of L-DMA were investigated. Then, the rheological and low-temperature properties of L-DMA-modified asphalt were investigated using the dynamic shear rheological (DSR) test and bending beam rheological (BBR) test. Moreover, the modification mechanism was explored by FTIR. It was found that L-DMA can be effectively synthesized and has good thermal stability. The incorporation of L-DMA increases the composite modulus, viscosity, creep recovery rate and rutting factor of asphalt binder, resulting in an enhancement of its high-temperature performance. At a high L-DMA content of 10%, the low-temperature performance of the modified asphalt was enhanced. The modification of L-DMA to asphalt is mainly a physical process. Hydrogen bonds and conjugated systems generated by the introduction of catechol groups enhance the adhesion properties of asphalt. In general, L-DMA improves the properties of asphalt and theoretically can improve the water resistance of asphalt, which will be explored in future research.Keywords:L-DMA;mussel bionic materials;modified asphalt;modification mechanism;rheological properties
研究领域:
材料科学
·
道路工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 5
·1220-1233
·
IF 7.2
Qin Qing,Xiong Gang,Han Lin,Zhang Yujuan,Shen Zhen,Ge Changchun
Digital light processing (DLP) is a crucial additive manufacturing (AM) technique for producing high-precision ceramic components. This study aims to optimize the formulation of Si 3 N 4 slurry to enhance both its performance and manufacturability in the DLP process, and investigate key factors such as particle size distribution, photopolymer resin monomer ratios, and dispersant types to improve the slurry’s rheological properties. Through these optimizations, a photosensitive Si 3 N 4 slurry with 50vol% solid content was developed, exhibiting excellent stability, and low viscosity (2.48 Pa·s at a shear rate of 12.8 s −1 ). The effects of gas-pressure sintering on the material’s phase composition, microstructure, and mechanical properties were further explored, revealing that this technique significantly increases the flexural strength of the green sample from (109 ± 10.24) to (618 ± 42.15) MPa. The sintered ceramics exhibited high hardness ((16.59 ± 0.05) GPa) and improved fracture toughness ((4.45 ± 0.03) MPa·m 1/2 ). Crack trajectory analysis revealed that crack deflection, crack bridging, and the pull-out of rod-like β-Si 3 N 4 grains, are the main toughening mechanisms, which could effectively mitigate crack propagation. Among these mechanisms, crack deflection and bridging were particularly influential, significantly enhancing the fracture toughness of the Si 3 N 4 matrix. Overall, this research highlights how monomer formulation and gas-pressure sintering strengthen the performance of Si 3 N 4 slurry in the DLP three-dimensional printing technique. This work is expected to provide new insights for fabricating complex Si 3 N 4 ceramic components with superior mechanical properties.
研究领域:
材料科学
·
陶瓷制造
·
增材制造
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Xingyi Zhu,Muhammad Kashif Anwar,Guomin Deng,Xiaoming Wang,Jiakang Wang,Yating Zhang,Junming Su,Zedong Qu,Francisco A. Gilabert
This study investigates the novel application of microwave heating to optimize the rheology, interlayer bond, and buildability of 3D-printed geopolymers at various printing stages. Unlike conventional methods, microwave heating significantly enhances stacking performance (buildability) while reducing flowability, addressing critical challenges in 3D printing. The findings also indicate that deformation resistance coefficients for fiber-free and fiber-reinforced geopolymers reaches 0.933–1.00 after 30 and 45 seconds of microwave exposure, respectively, demonstrating superior shape retention ability after microwave heating. Notably, microwave heating improves ultra-early (i.e., 2 h and 4 h) interfacial strength proportionally to power and duration, offering a breakthrough for rapid construction. In addition, drying shrinkage decreases by 0.096–0.226 % (fiber-free), 0.054–0.166 % (PE fiber), and 0.067–0.17 % (steel fiber), highlighting the efficacy of microwave heating in mitigating cracking of 3D-printed geopolymers. The optimized microwave processing parameters establish in this study serve as a foundation for in-line, large-scale 3D printing applications, offering a scalable solution in printability and structural integrity.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2025
·
IF 2.3
Liu Yinyin,Wang Lei,Liu Guiru,Jin Hongtao,Lai Xiaojuan,Li Haibin,Chen Jiali
X-β-cyclodextrin (β-CD), a vinyl-functionalized monomer, was successfully synthesized through the chemical modification of β-CD. Subsequently, X-β-CD was co-polymerized with acrylic acid, acrylamide, and 2-acrylamido-2-methylpropane sulfonic acid via free radical copolymerization to produce a novel hydrophobic inclusion polymer—X-β-HPAM. The structure of X-β-HPAM was characterized using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and scanning electron microscopy. Furthermore, its aqueous rheological properties were analyzed through rheometry. The results revealed that at shearing temperatures of 120 °C and 150 °C and a shear rate of 170 s −1 , the viscosity of a 0.4% X-β-HPAM aqueous solution gradually increased beyond a shear time of 1200 s, indicating the thickening effect of the X-β-CD monomer on the solution at elevated temperatures. Following shearing for 2 h, the residual viscosity stabilized at 62.24 mPa·s, after undergoing a shearing process for a duration of 2 h, the viscosity of a X-β-HPAM salt solution, with a mass fraction of 0.4% and dissolved in a 5% NaCl aqueous solution at a temperature of 150℃, remains consistently stable at the value of 60.04 mPa·s, demonstrating the excellent salt, temperature, and shear resistance of X-β-HPAM. Thus, β-CD-modified polyacrylamide enhances the thermal resistance and shear resistance of fracturing fluids, thereby improving recovery efficiency. Graphical abstract
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）