JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Ning Kang,Bauyrzhan Sarsenbekuly,Hairong Wu
Polymer has been widely studied as an effective means to improve foam stability in reservoir exploitation. Nevertheless, the deployment of this technology in low-permeability reservoirs may prove challenging and could potentially result in formation damage. The innovation of this study is the utilization of viscoelastic surfactants to create enhanced air foam with wormlike micelles and three-dimensional network structures. This can result in a synergy between the properties of fluidity control and oil washing efficiency, thereby enhancing the strength of the foam. The supramolecular self-assembly property facilitates the injection of the foam into the formation while preserving its original structure and properties, thereby enhancing the stability of the foam and markedly improving the recovery of low permeability reservoirs. The viscoelastically enhanced air foam system is composed of the zwitterionic surfactant erucylamido propyl betaine (EHSB) and the anionic surfactant sodium dodecyl sulfate (SDS), which has been designated EHSB-SDS. The foam performance was evaluated using the Waring Blender method and rheological behavior, with foam fluid viscosity, initial foam volume (V 0 ), half-life for drainage (t d ) and foam half-life (t f ) serving as the evaluation indicators. The influence of temperature, salinity and oil content on foam performance is considered to explore the reservoir adaptability. The dynamic/micro stability, macro rheological properties, interfacial viscoelasticity and Zeta potential of the enhanced air foam system were further studied to clarify the stability mechanism of enhanced air foam system. The t d , t f and composite index of EHSB-SDS is 56.6 min, 36 h and 648000 mL·min, respectively. The viscoelastic surfactants form wormlike micelles, which increase the foam solution viscosity. This results in a slow drainage speed and the rupture of the bubbles. The adsorption of surfactant at the gas/liquid interface results in an increase in surface activity, interfacial expansion modulus and zeta potential, which serves to enhance the strength of the liquid film and the electrostatic repulsion among bubbles. These three factors are primarily responsible for the stability of the foam. The research establishes a theoretical basis for the effective development of low permeability reservoirs and new foam flooding technology.
研究领域:
石油工程
·
化学工程
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DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 12
·2623
·
IF 5
Jiadong Wang,Min Wang,Chenxin Xu,Yang Han,Xuan Qin,Liqun Zhang
The development of damping and tire materials has led to a growing need to customize the dynamic viscoelasticity of polymers. In the case of polyurethane (PU), which possesses a designable molecular structure, the desired dynamic viscoelasticity can be achieved by carefully selecting flexible soft segments and employing chain extenders with diverse chemical structures. This process involves fine-tuning the molecular structure and optimizing the degree of micro-phase separation. It is worth noting that the temperature at which the loss peak occurs increases as the soft segment structure becomes more rigid. By incorporating soft segments with varying degrees of flexibility, the loss peak temperature can be adjusted within a broad range, from −50 °C to 14 °C. Furthermore, when the molecular structure of the chain extender becomes more regular, it enhances interaction between the soft and hard segments, leading to a higher degree of micro-phase separation. This phenomenon is evident from the increased percentage of hydrogen-bonding carbonyl, a lower loss peak temperature, and a higher modulus. By modifying the molecular weight of the chain extender, we can achieve precise control over the loss peak temperature, allowing us to regulate it within the range of −1 °C and 13 °C. To summarize, our research presents a novel approach for tailoring the dynamic viscoelasticity of PU materials and thus offers a new avenue for further exploration in this field.Keywords:micro-phase separation;polyurethane;dynamic viscoelasticity;diols
研究领域:
材料科学
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高分子化学
·
机械工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Jie Miao,Wenxiao Long,Jiayi Yan,Chengjia Xiong
Topology freezing transition temperature (Tv) of vitrimers is an important indicator for their applications. Tvof vitrimers could be changed by using chemical methods. Herein, a physical method is proposed to adjust and detect Tv of vitrimers based on the upper vitrimers doped with SiO2nanoparticles and the lower photonic crystals (PCs) from SiO2 nanoparticles. When the photonic coatings are heated, the upper vitrimers are changed from viscoelastic-solid state to viscoelastic-liquid state, intensities of reflection peaks of PCs are increased because light would easily penetrate the coatings. Tv of vitrimers could be decided according to great changes of intensities. When photonic coatings are synthesized at 140 °C for 6 h under 2.6 MPa, the lower PCs are kept the same, as doping amounts of SiO2 nanoparticles of the upper vitrimers are increased, Tvof photonic coatings are decreased from 90 °C to 72.5 °C. They have potential applications in adjustment and detection of Tv of other vitrimers, anti-counterfeiting and displays.
研究领域:
材料科学
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高分子科学
·
纳米技术
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光学
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化学物理
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xiaoguang Zhang,Lixia Xiong
Spray droplet size is an important factor affecting spray drift, which is directly related to the spray effect and efficiency by unmanned aerial vehicle . Effect of adjuvants on the droplet size of emamectin benzoate dilute emulsion was systematically investigated by measuring droplet size, dynamic surface tension , and rheology. The results showed that droplet size was independent of dynamic surface tension and viscosity, but was related to the viscoelastic property and strain. For the emulsions with N, N-dimethyldodecylamine-N-oxid (OA), polyalkoxylated butyl ether (LQ) and poly (vinyl alcohol) (PVA), the viscous modulus (G′′) were higher than elastic modulus (G′) under the crossover frequency, indicating that the emulsions were the viscous liquid. Furthermore, the diluted emulsions with OA and LQ had small drop, while that with PVA had big drop. These leaded to the breakup of the liquid sheet at lower deformation and the small spray droplet formation. While emulsions containing Guar gum 2-hydroxy-3-(trimethylammonio) propyl ether chloride (Gum Cl) and Sil800 (silicone adjuvant) exhibited a weak elastic behavior, and had the large droplet size. In addition, compared to the emulsions with OA, LQ and PVA, the dilute emulsions with Gum Cl and Sil800 had the large drop diameter, and G′ had a rapid decrease at bigger strain. This suggested the dilute emulsions with Gum Cl and Sil800 had a high stability during atomization . The study would provide a useful guide for selecting drift control adjuvants and raising pesticide efficiency.
研究领域:
农学
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农药科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 7
·1642
·
IF 5
Kang Liang,Qunzhang Tu,Xinmin Shen,Juying Dai,Qin Yin,Jinhong Xue,Xuan Ding
Due to the viscoelasticity of rubber materials, hysteresis loss due to deformation is the main reason for the rolling resistance of high-speed rubber tracks. Since the structure and material of high-speed rubber track assemblies are different from traditional tires and metal tracks, the rolling resistance theory of traditional wheeled and tracked vehicles is not applicable. Therefore, in order to determine the rolling resistance scientifically and accurately, the mechanism research of the rolling resistance of high-speed rubber track assembly is the key to the design of high-speed rubber crawler vehicles. In this paper, the stress–strain characteristics of rubber track under the action of compression, tension, bending, and driving were studied. The strain load spectrum of rubber tracks was established, and the strain cyclic load was extracted by the rainflow method. The temperature model of the rubber track was developed based on its dynamic characteristics. On the basis of energy conservation, the hysteresis loss of rubber is equivalent to the energy consumption of rolling resistance, and the theoretical model of rolling resistance of high-speed rubber track assembly is established. In accordance with the model above, the key influencing factors and changing trends of rolling resistance are analyzed, which provides a theoretical basis for the performance optimization of high-speed rubber track assembly.Keywords:rubber track;rolling resistance;thermo-mechanical;viscoelastic;energy consumption
研究领域:
机械工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 12
·2105742
·
IF 17.521
Ke Li,Xingjie Zan,Chen Tang,Zhuangzhuang Liu,Jianghuan Fan,Gang Qin,Jia Yang,Wei Cui,Lin Zhu,Qiang Chen
Repeatability and high adhesion toughness are usually contradictory for common polymer adhesives. Repeatability requires temporary interactions between the adhesive and the substrate, while high adhesion toughness is usually achieved by permanent bonding. Integrating these two features into one adhesive system is still a daunting challenge. Here, the development of a series of viscoelastic elastomers composed of a soft and hard segment is reported, which exhibit tough, instant, yet repeatable adhesion to a variety of soft and hard surfaces. Such a combination of mutually exclusive properties is attributed to the synergy of high mobility of polymer chains and massive viscoelastic dissipation of the elastomers around the interface. By optimizing the relaxation time and mechanical dissipation, the resulting adhesives can achieve a tough yet repeatable adhesion toughness above 2000 J m −2 , superior to the best-in-class commercial adhesives. Numerous acrylate monomers are proven applicable to the preparation of such adhesives, validating the universality of the fabrication method. The application of these elastomers as adhesive and protective layers in soft electronics by virtue of their universal and tough adhesion to various soft and hard substrates is also demonstrated.
研究领域:
材料科学
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化学工程
·
软电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 42
·期 10
·1495-1504
·
IF 4.1
Wu Shi-Long,Yang Huan-Huan,Chen Quan
In this study, we synthesized a series of ABA-type vitrimers by crosslinking the short A moieties of precursors with a bifunctional crosslinker and evaporating the small molecular byproduct. The vitrimer samples thus prepared exhibit linear viscoelasticity dependent on the length of A moiety as well as the content of the crosslinks. When the average number of A monomers per end moiety m =1.1, the crosslinker can only extend the chain but not crosslink the chain. When m becomes 2.8 or higher, introducing a crosslinker first leads to the gelation, whereas excess in crosslinker molecules leads opening of the crosslinking sites and accordingly reentry into the sol regime. Surprisingly, a further increase in the length of the A moieties increases the relaxation time much weaker than the exponential increase seen for the physically crosslinked ABA-type ionomers. We attribute this difference to the distinct relaxation mechanisms: the relaxation of the vitrimer samples is based on relatively independent exchange reactions, which contrasts with the ABA-type ionomers that relax through the collective hopping of connected ionic groups from one ion aggregate to another.
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
Gels
·
2023
·Vol. 9
·期 2
·145
·
IF 4.6
Shilei Zhu,Yan Wang,Zhe Wang,Lin Chen,Fengbo Zhu,Yanan Ye,Yong Zheng,Wenwen Yu,Qiang Zheng
Biological soft tissues are intrinsically viscoelastic materials which play a significant role in affecting the activity of cells. As potential artificial alternatives, double-network (DN) gels, however, are pure elastic and mechanically time independent. The viscoelasticization of DN gels is an urgent challenge in enabling DN gels to be used for advanced development of biomaterial applications. Herein, we demonstrate a simple approach to regulate the viscoelasticity of tough double-network (DN) hydrogels by forming sulfonate–metal coordination. Owing to the dynamic nature of the coordination bonds, the resultant hydrogels possess highly viscoelastic, mechanical time-dependent, and self-recovery properties. Rheological measurements are performed to investigate the linear dynamic mechanical behavior at small strains. The tensile tests and cyclic tensile tests are also systematically performed to evaluate the rate-dependent large deformation mechanical behaviors and energy dissipation behaviors of various ion-loaded DN hydrogels. It has been revealed based on the systematic analysis that robust strong sulfonate–Zr4+coordination interactions not only serve as dynamic crosslinks imparting viscoelastic rate-dependent mechanical performances, but also strongly affect the relative strength of the first PAMPS network, thereby increasing the yielding stress σyand the fracture stress at break σband reducing the stretch ratio at break λb. It is envisioned that the viscoelasticization of DN gels enables versatile applications in the biomedical and engineering fields.Keywords:metal-coordinated dynamics;viscoelastic properties;double-network gels
研究领域:
生物材料学
·
力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-7
·
IF 2.833
Dai Caili,Zhang Yue,Gao Mingwei,Li Yuyang,Lv Wenjiao,Wang Xinke,Wu Yining,Zhao Mingwei
In this work, a novel nanoparticle-enhanced wormlike micellar system (NEWMS) was proposed based on the typical wormlike micelles composed of cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal). In order to strengthen the structure of wormlike micelles, silica nanoparticles are used to design the novel nanoparticle-enhanced wormlike micelle. The stability and morphologies of silica nanoparticles were studied by dynamic light scattering (DLS) and transmission electron microscopy (TEM) at first. After the formation of NEWMS, the rheological properties were discussed in detail. The zero-shear viscosity of NEWMS increases with the addition of silica nanoparticles. Dynamic oscillatory measurements show the viscoelastic properties of NEWMS. Through comparison with the original wormlike micelles, the entanglement length and mesh size of NEWMS are nearly unchanged, while the contour length increases with the increase of silica concentration. These phenomena confirm the enhanced influence of silica nanoparticles on wormlike micelles. The formation mechanism of NEWMS, especially the interactions between wormlike micelles and nanoparticles, is proposed. This work can deepen the understanding of the novel NEWMS and widen their applications.
研究领域:
化学
·
材料科学
·
胶体与界面科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 21
·
IF 1.86
Jingqi Ji,Yangchuan Ke,Yang Pei,Guoliang Zhang
In this study, exfoliated montmorillonite (MMT) nanolayers were successfully encapsulated in acrylamide/acrylic acid/2-acrylamido-2-methylpropanesulfonic acid (AM/AA/AMPS) terpolymer microspheres by in situ inverse suspension polymerization with the aid of the organic intercalation modification and the lateral groups of terpolymer chains. The introduction of well-dispersed MMT nanolayers reveals a significant enhancement of the comprehensive properties of these nanocomposite microspheres, such as the viscoelasticity, thermal stability, and plugging ability. Compared with the pure terpolymer, the elastic modulus ( G ′) of terpolymer/2.0 wt % O-MMT nanocomposites is 4.30 times higher and the decomposition temperature of these nanocomposites increases by 40 °C. The plugging rate reaches as high as 86.6%. Besides, surface morphology, swelling degree, and wetting behavior can be effectively tuned by varying the content of exfoliated MMT. The wetting angle increases to 82.0 ° which is suitable for modifying the formation channels. These selected nanocomposite microspheres can effectively enter and plug the high permeable microchannels. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44894.
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
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Ziyang Gong,Xuefeng Gui,Yihao Yang,Weile Li,Jiwen Hu,Daguang He,Xiaohua Cui,Yuanyuan Tu
Liquid polysiloxanes are prone to misting in coating processes performed at high roller speeds, and the addition of anti-misting agents is a cost-effective method to address this issue. In this work, a series of mildly cross-linked fluorinated polysiloxane-based viscoelastic fluids were synthetized via the successive hydrosilylation of (perfluorohexyl) ethylene (PFHE) and vinyl-terminated polydimethylsiloxane (PDMS-Vi) with hydride-terminated polydimethylsiloxane (PMHS). As anti-misting agents for high-speed coating process of silicone release agents, their inhibition efficiency can reach 92.1 % with a dosage of 4 wt%. It was also found that the physical properties, rheology, and molecular structure of the agents have various influences on inhibition efficiency depending on the anti-misting mechanisms. Additionally, the agents could significantly reduce the negative impact of coatings, and have no obvious adverse effect on the heat curing process or the transparency. The transparency of the films on the surface of the underlying polyethylene terephthalate (PET) substrate is still in excess of 95 %. Finally, the agents are conducive to improving the thermal stability of the films, and the results show that this type of viscoelastic fluids has the potential to be used in the industrial production of silicone release coatings.
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
Energies
·
2021
·Vol. 14
·期 6
·1683
·
IF 3.004
Zuoquan Zhu,Yaolong He,Hongjiu Hu,Fangzhou Zhang
The mechanical behavior of electrode composite during the drying preparation has played a crucial role in the electrochemical performance of lithium-ion batteries (LIBs). Our work aimed at developing an integrated analysis method to study the component distribution, mechanical properties, and internal stress of composite coating in the process of electrode drying. The main influence factors of drying stress were thoroughly investigated. It was found that this present model could capture not only the heterogeneity effect of inactive ingredients but also the porosity-dependent viscoelasticity of electrode composite. Meanwhile, the calculated effective modulus and stress evolution upon drying time were in acceptable accord with the experimental data. Furthermore, the rapid solidification markedly increased the drying stress in electrodes and significantly impaired the tensile strength of electrode composite due to the highly gradient distributed constituents. However, the stress level at high drying temperature could be significantly reduced by an aqueous sodium alginate binder instead of poly(vinylidene fluoride). The obtained results will be a great help in efficiently manufacturing LIB electrodes with adequate mechanical integrity.Keywords:electrode composite;gradient distributed ingredients;viscoelasticity;drying stress
研究领域:
材料科学
·
电池技术
✓ 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）