Petroleum Science
·
2022
·
IF 4.757
Tian-Ci Zhang,Ji-Jiang Ge,Hao Wu,Hong-Bin Guo,Bao-Lei Jiao,Zhen Qian
The BST oilfield in the northwestern Taklamakan Desert is a fractured carbonate reservoir, but issues of water breakthrough are becoming increasingly severe with the development of water flooding. Unfortunately, the high-temperature and high-salt conditions (130 °C, 71695 mg/L) of the BST oilfield pose challenges for the development of plugging agents. In this study, the effects of 2-acrylamido-2-methylpropane sulfonic acid (AMPS) content on AM/AMPS copolymers and gels were studied through viscosity measurements, nuclear magnetic resonance (NMR), and cryo-scanning electron microscope (Cryo-SEM). Moreover, the AMPS stabilization mechanism of the polymers and gels was explained. Heat-resistant and salt-tolerant gel systems were developed, and their gelation properties, thermal stability, injection capacity, and plugging ability were evaluated. Experimental results showed inconsistencies between the effects of AMPS content on the polymers and gels. For the polymers, the thermal stability increased with increased AMPS content in the polymer. However, excessive AMPS content resulted in poor gelation and low strength. The developed gel systems with S30 polymer (AMPS content is approximately 26%) exhibited excellent thermal stability, controllable gelation time, good injection capacity, and plugging ability. The field application results indicated that most production wells had a positive response, with reduced water-cut and increased daily oil production.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 10
·51763
·
IF 3.125
Jiaxian Qiu,Yingrui Bai,Jinsheng Sun,Liyao Dai,Shaofei Lei,Fan Liu
Aiming at the lack of plugging agent for oil-based drilling fluid leakage in fractured formation, an oil-based gel-plugging agent with high structural strength and strong thermal stability was synthesized based on monomer polymerization and crosslinking. According to the preparation experiment, when the total concentration of methyl methacrylate (MMA) and butyl acrylate (BA) is 30% and the ratio is 6:4, the oil-based gel solution can be completely gelatinized from 80 to 200°C, which has high gel strength and controllable gelation time. The effects of total concentration of BA and MMA, the ratio of BA and MMA, synthesis temperature, oil-based drilling fluid invasion, shear effect, and fiber concentration on gelling performance were systematically studied. Fourier transform infrared molecular structure analysis showed that the oil-based gel contained benzene ring group and ester characteristic group. From the rheological properties of oil-based gel with 30% gelling agent at 160°C, it could be seen that the elastic modulus G ′ of 10 Hz is 232 kPa, which is much larger than the storage modulus G ″ is 99 kPa, which reflects the solid properties and has good elasticity and high strength. The displacement experiment of sand filling pipe and dynamic and static plugging experiment of high temperature and high pressure shows that the oil-based gel has high bearing capacity in fractures and sand filling pipe. The bearing pressure is 3.01 MPa in 6 mm fractures, and the bearing pressure gradient is 0.602 MPa/cm.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 9
·3654-3663
·
IF 3.288
Dong-Mei Ma,Jing Wang,Hao Guo,Dong-Jin Qian
Thioxanthones (TXs) and viologens (VIOs) are important photo-sensitizers and electron mediators with interesting opto-electrochemical properties and potential applications for novel opto-electrical devices, displays, switches and sensors. Here, we reported the photophysical and electrochemical properties of newly synthesized TX–VIO binary derivatives, and their photo-/electrochromic displays in the ionic liquids and polymer gels. The precursor of TXBr (without the VIO substituent) gave off a blue light emission centered at about 437 nm with a quantum efficiency (QE) of approximately 0.2. For TX-VIOs, their QE was below 0.01; this significant luminescent quenching was attributed to an intramolecular energy transfer from the excited singlet state of TX to electroactive VIO. Thus, these TX–VIOs displayed good photochromic behaviors under ultraviolet and/or visible light radiation. Cyclic voltammograms of TX–VIOs showed two couples of chemically reversible waves centered at approximately −0.43 and −0.90 V (vs. Hg/Hg2Cl2). The former one was attributed to the electron transfer process of TX–VIO2+ ↔ TX–VIO+˙, and the latter one to that of TX–VIO+˙ ↔ TX–VIO0 together with that of TX(red)–VIO2+ ↔ TX(ox)–VIO2+. Finally, sandwiched types of transparent and flexible photo- and electrochromic devices were constructed with the use of TX–VIOs in the ionic liquids and polymeric gels as the light-sensitizer and color display layer. These devices displayed a good transmittance and good reversible color (pink, blue and colorless) change behavior under visible light radiation or an applied bias of −2.4 V.
研究领域:
化学
·
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Gels
·
2022
·Vol. 8
·期 8
·475
·
IF 4.432
Chengdi Huang,Hanwei Zhang,Ziqing Hu,Youping Zhang,Xiaofan Ji
Polymer gels have been widely used in the field for tissue engineering, sensing, and drug delivery due to their excellent biocompatibility, hydrophilicity, and degradability. However, common polymer gels are easily deformed on account of their relatively weak mechanical properties, thereby hindering their application fields, as well as shortening their service life. The incorporation of reversible non-covalent bonds is capable of improving the mechanical properties of polymer gels. Thus, here, a poly(methyl methacrylate) polymer network was prepared by introducing host–guest interactions between pillar[5]arene and pyridine cation. Owing to the incorporated host–guest interactions, the modified polymer gels exhibited extraordinary mechanical properties according to the results of the tensile tests. In addition, the influence of the host–guest interaction on the mechanical properties of the gels was also proved by rheological experiments and swelling experiments.Keywords:polymer gels;host–guest interactions;mechanical performance;pillar[5]arene
研究领域:
材料科学
·
化学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Huiwen Shi,Xin Wang,Huijun Guo,Yanyan Yang,Yongqi Yang
Hydrogels have emerged as promising candidates for flexible electronics applications. However, their inherent water loss characteristics significantly compromise performance stability during operation, thereby limiting their practical applications. In this study, we developed a novel polymer gel by substituting water with polyethylene glycol-modified silicone oil. This polymer gel maintained the desirable softness while exhibiting superior stability under ambient conditions. The gel exhibited tunable mechanical properties with an adjustable modulus compatible with human skin tissue. Due to its low energy dissipation characteristics, the gel could sustain more than 1000 stretching cycles without notable performance deterioration. The material's exceptional self-bonding properties facilitated the fabrication of flexible electronic devices through simple stacking processes, while its strong adhesion enabled reversible skin attachment. The gel's electrical insulation properties ensured reliable operation of flexible circuits, and its compatibility with liquid metal enabled the fabrication of strain-sensitive flexible circuits. When applied as wearable sensors, these devices demonstrated stable skin adhesion and maintain reliable operation for over 30 days under ambient conditions. Moreover, the gel's self-bonding characteristics enabled the construction of multilayered three-dimensional flexible circuits, leading to enhanced strain sensitivity and device miniaturization. These comprehensive performance advantages, combined with exceptional stability, position this polymer gel as a promising material for advancing flexible electronics, particularly in the development of compact, high-performance flexible wearable devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Geoenergy Science and Engineering
·
2024
·
IF 0
Mingwei Zhao,Ziteng Yang,Xiangjuan Meng,Zhongzheng Xu,Yining Wu,Caili Dai
The temperature resistance of polymer gel fracturing fluids is the key to ensure its application in deep oil and gas reservoirs. Currently, the methods to improve the temperature resistance of polymer gel fracturing fluids are mainly based on the additives commonly used in fracturing fluids, but rarely studied on improving the strength of crosslinked systems by strengthening its non-covalent interactions. Herein, we separately introduce ethanol and glycol into the partially hydrolyzed polyacrylamide (HPAM) crosslinked zirconium polymer gels to form the fracturing fluid system with higher temperature-resistant ability. The concentrations of the HPAM and crosslinking agent are all 0.6 wt%. After shearing at 120 °C and 170 s −1 for 1 h, the addition of ethanol and glycol can increase the retention viscosity of the polymer gels from 43 mPa s to 148 mPa s and 204 mPa s, respectively. Microscopic characterization demonstrates that the addition of ethanol and glycol makes the polymer gels more dense “honeycomb” and “dendritic” structures, which may be the main reasons for the temperature resistance enhancement of the system. Additionally, the molecular dynamics simulations show that the supramolecular interaction in the polymer gel system is greatly enhanced by the formation of hydrogen bonds when the alcohol is added at low concentrations. Meanwhile, the zirconium ions play a bridging role in connecting oxygen atoms in the carboxyl group in HPAM and oxygen in the alcohol hydroxyl group. The hydrogen bonds and O-Zr-O bridges can strengthen the non-covalent interactions of the system, inhibiting the destruction of polymer gel structure at high temperatures and enhancing its temperature resistance. However, when the alcohol concentration of the system is too high, the crosslinking strength of the polymer gels is weakened to different degrees due to the competitive effect of the alcohol on the crosslinking agent. Both experimental results and theoretical simulation further deepen the understanding of alcohol to improve the temperature resistance of polymer gels, and can promote the subsequent application of alcohol to polymer gel fracturing fluids for property enhancement.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
Biomaterials Science
·
2019
·Vol. 7
·期 9
·3918-3925
·
IF 5.251
Hailin Cong,Liping Zhou,Qingye Meng,Yixin Zhang,Bing Yu,Youqing Shen,Hao Hu
Polymer gels can be classified as chemical and physical gels, depending on the type of cross-link. Physical gels usually form by physical cross-linking, such as hydrogen bonding, van der Waals and/or p–p interactions, which can avoid the use of additional cross-linking agents. Polyamidoamine (PAMAM) dendrimers possess abundant active groups on their surfaces. Modified dendrimers have been used as versatile linkers in some projects. In this work, polymer gels composed of PAMAM dendrimers without any covalent bonding cross-linking agents were prepared. The number of amino groups and ester groups on the surface of the dendrimers was precisely regulated to help form hydrogen bonds between adjacent dendrimers. The prepared dendrimer-based polymer gels retain the properties of PAMAM dendrimers such as antibacterial properties, and the unique structures make the gels exhibit high compressive strengths but relatively low tensile strengths. Interestingly, the prepared gels show good anti-inflammatory properties in acute inflammation models of mice with ear edema. The inflammatory inhibition rate and hematoxylin–eosin (H&E) staining method were used to confirm the anti-inflammatory effect. This present study demonstrates that the dendrimer-based polymer gels achieved through hydrogen bonding could be a versatile platform for tissue engineering.
研究领域:
材料科学
·
生物医学工程
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 12
·2109850
·
IF 18.808
Xiaoqing Ming,Le Yao,He Zhu,Qi Zhang,Shiping Zhu
Responsive polymer materials possessing variable mechanical properties have shown promising practical applications, whereas water has clear advantages among the triggers owing to its wide abundance, green characteristics, as well as mild conditions involved. However, ubiquitous water-induced softening would prevent polymer materials from applications with high humidity or aqueous environment. Herein, an unprecedented polymer gel material is reported that exhibits a dramatic and reversible water-induced stiffening base on phase separation, differing from traditional ones that are usually weakened upon hydration due to the plasticizing effect. The material shows a large stiffness change in Young's modulus (as much as 10 4 times), which is much larger than that induced by glass transition and comparable to that caused by crystallization-melting process. The polymer materials are fabricated in a facile way by introducing an ionic liquid and a lithium salt into a poly(benzyl methacrylate) network. Moreover, the volume remains almost unchanged during the reversible soft–stiff transition. A universal approach of water-induced stiffening is proposed and verified on various systems. As for demonstration, this material is used for humidity-induced shape memory. This work offers an effective method for developing water-induced stiffened material and will pave the way toward potential applications for water-responsive polymer materials.
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 9
·726
·
IF 4.6
Zhenfeng Ma,Mingwei Zhao,Ziteng Yang,Xiangyu Wang,Caili Dai
To expand the applicability of gel fracturing fluids in ultra-high-temperature reservoirs, a temperature-resistant polymer was synthesized using the solution polymerization method. Subsequently, an ultra-high-temperature-resistant polymer gel was formulated by incorporating an organic zirconium crosslinking agent. A comprehensive investigation was carried out to systematically study and evaluate the steady shear property, dynamic viscoelasticity, and temperature and shear resistance performance, as well as the core damage characteristics of the polymer gel. The obtained results demonstrate that the viscosity remained at 147 mPa·s at a temperature of 200 °C with a shear rate of 170 s−1. Compared with the significant 30.9% average core damage rate observed in the guanidine gum fracturing fluid, the core damage attributed to the polymer gel was substantially mitigated, measuring only 16.6%. Finally, the gelation mechanism of the polymer gel was scrutinized in conjunction with microscopic morphology analysis. We expect that this study will not only contribute to the effective development of deep and ultradeep oil and gas reservoirs but also furnish a theoretical foundation for practical field applications.Keywords:polymer gel;ultra-high-temperature-resistant;rheology property;gelation mechanism
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2024
·
IF 2.7
Yihan Cui,Huijie Feng,Xiaoqiao Xie
A new family of versatile water-enhanced adhesives based on hydrophobic polymers and amphiphilic alkanoic acids has been developed. These polymer gels form responsive surface bonding upon water exposure through softening effect and/or autonomous rearrangement of alkanoic acid molecules at the interface, thereby enhancing adhesion on both hydrophilic and hydrophobic, smooth and rough surfaces under wet conditions.
研究领域:
材料科学
·
化学工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2013
·
IF 5.868
Jing Wang,Menghe Miao,Zongbao Wang,William Humphries,Qun Gu
We report a method of improving the alignment of carbon nanotubes (CNTs) in a solid strand prepared from a CNT forest without dispersing and regrouping them. The use of a lubricant loosens the interconnections between the carbon nanotubes so that they can slide relative to each other and align themselves longitudinally. A highly stretchable polymer gel fibre is used as a carrier to apply the lubricant to a continuous length of the carbon nanotube strand so that the strand can be drawn uniformly and continuously by a series of drawing operations. The lubricant is then extracted to produce a highly aligned carbon nanotube reinforced polymer composite fibre that demonstrates a remarkable reinforcement effect. The CNT strength utilisation in the composite fibre is one order of magnitude greater than that in a pure carbon nanotube spun yarn.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Yingxue Chang,Nai-En Shi,Shulin Zhao,Dongdong Xu,Chunyan Liu,Yu-Jia Tang,Zhihui Dai,Ya-Qian Lan,Min Han,Jianchun Bao
Core–shell nanohybrids containing cheap inorganic nanocrystals and nanocarbon shells are promising electrocatalysts for water splitting or other renewable energy options. Despite that great progress has been achieved, biomimetic synthesis of metal phosphates@nanocarbon core–shell nanohybrids remains a challenge, and their use for electrocatalytic oxygen evolution reaction (OER) has not been explored. In this paper, novel nanohybrids composed of coralloid Co2P2O7 nanocrystal cores and thin porous nanocarbon shells are synthesized by combination of the structural merits of supramolecular polymer gels and a controllable thermal conversion technique, i.e., temperature programmable annealing of presynthesized supramolecular polymer gels that contain cobalt salt and phytic acid under a proper gas atmosphere. Electrocatalytic tests in alkaline solution show that such nanohybrids exhibit greatly enhanced electrocatalytic OER performance compared with that of Co2P2O7 nanostructure. At a current density of 10 mA cm–2, their overpotential is 0.397 V, which is much lower than that of Co2P2O7 nanostructures, amorphous Co-Pi nanomaterials, Co(PO3)2 nanosheets, Pt/C, and some reported OER catalysts, and close to that of commercial IrO2. Most importantly, both of their current density at the overpotential over 0.40 V and durability are superior to those of IrO2 catalyst. As revealed by a series of spectroscopic and electrochemical analyses, their enhanced electrocatalytic performance results from the presence of thin porous nanocarbon shells, which not only improve interfacial electron penetration or transfer dynamics but also vary the coordination environment and increase the number of active 5-coordinated Co2+ sites in Co2P2O7 cores.
研究领域:
材料科学
·
电化学
✓ 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）