POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 1
·294-303
·
IF 2.578
Lei Li,Shan Li,Hao Wang,Zongmin Zhu,Xianze Yin,Jiawei Mao
In this work, a DOPO-based imidazolone derivative named DHI was synthesized using DOPO, 5-amino-2-benzimidazolinone and 4-hydroxybenzaldehyde as raw materials. The chemical structure of DHI was characterized by 1 H-NMR, 31 P-NMR and Fourier transform infrared spectra (FTIR). Then, a series of different flame-retardant epoxy resin (EP) thermosets were prepared by mixing flame retardant DHI. The thermal properties of the cured EPs was investigated by thermogravimetry analysis (TGA) and differential scanning calorimeter (DSC), and the results showed the thermal stability and glass transition temperature ( T g ) of the cured EP modified with DHI declined slightly compared with that of neat EP. The limited oxygen index (LOI) and UL94 test results exhibited DHI imparted good flame retardancy to EP. The EP-4 (phosphorus content of 1.25%) possessed a LOI value of 36.5% and achieved a V-0 rating. Furthermore, the peak of heat release rate (PHRR) and total heat release rate (THR) of EP-4 decreased by 38.7% and 24.5%, respectively. Excitedly, the total smoke production (TSP) of EP-4 sample declined by 62.5%, which meant DHI also made EP obtain excellent smoke suppression property. Moreover, the flame-retardant mechanism was studied by scanning electron microscopy (SEM) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). It was reasonable inferred that DHI could not only promote EP to form dense char layer in condensed phase, but also restrain combustion in gaseous phase through catching the free radicals sourced from the degradation of EP.
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 Natural Gas Science and Engineering
·
2015
·
IF 2.157
Hanyi Zhong,Zhengsong Qiu,Dong Sun,Daoming Zhang,Weian Huang
Polyetheramines as shale hydration inhibitors in water-based drilling fluids have attracted great interests in recent years. In this paper, in order to clarify the relationship between inhibitive properties and molecular structures of polyetheramines, several inhibitive experimental methods including bentonite inhibition test, shale cuttings hot-rolling dispersion test, sedimentation volume measurement, and API filtration measurement were adopted to evaluate the inhibition variation of different polyetheramines. Furthermore, a series of analytical methods such as surface tension determination, zeta potential measurement, XRD , contact angle measurement , and water adsorption test were performed to identify the relationship between the inhibitive performance and molecular structures. The factors including molecular weight , number of amine group, and molecular chain affecting the interaction between polyetheramines and clay particles were analyzed. Polyetheramine with molecular weight of 230 and oxypropylene segment can reduce the interlayer spacing of the hydrated clay to the minimum and exhibit the best performance in comparison with others. The coordination of electrostatic adsorption with monolayer arrangement, hydrogen bonding, and hydrophobic shielding effect contributed to the top level of inhibition.
研究领域:
石油工程
·
材料化学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2016
·
IF 2.586
Jiang Guancheng,Qi Yourong,An Yuxiu,Huang Xianbin,Ren Yanjun
In this paper, the inhibition property of polyethyleneimine (PEI) in drilling fluid was studied. The inhibition property was evaluated by linear swell test and roll recovery. The addition of PEI 70000 resulted in the lowest swelling height, compared with the others inhibitor. Especially PEI was environmental and friendly. The inhibition mechanism was investigated by Fourier transform infrared spectroscopy , X-ray diffraction, X-ray photoelectron spectroscopy, Scanning electron microscopy, Zeta potential and Surface area analyzer. The negative charge in the surface of montmorillonite (Mt) was neutralized by the positive charge of PEI. PEI was adsorbed in the surface of Mt and intercalated into the interlayer of Mt, which reduced the hydration repulsion of diffuse electric double layer and leaded to inhibit the hydration of clay. Hydrogen bonding between amino groups in PEI and hydroxyl in the surface of Mt can be formed in the process. The coordination of electrostatic interaction and hydrogen bonding presented water molecules from the interlayer space of Mt, which resulted from the adsorption and intercalation of PEI in the surface and interlayer space of Mt. There was an amount of nitrogen in the backbone and side of PEI, leading to more positive ion than chitosan quaternary ammonium salt (HTCC). The more positive ion resulted in the stronger force between inhibitor and clay due to the protonation of nitrogen in water. The molecular weight of PEI has great influence on inhibition property. The larger molecular weight of PEI performed the better inhibition property except for PEI 1800 . Indicating the molecular weight of PEI was not the sole factor to control the inhibition property. What was more, the larger molecular weight of PEI leaded to the worse water-solubility.
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
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Hao Wu,Hen Chen,Qianwen Wang,Hongmin Yang
In this paper, the mercury re-emission from desulfurization slurry and mercury distribution in gas-liquid-solid three-phase at different desulfurization slurry parameters were studied. Besides, the inhibition performance of Fenton reagent for mercury re-emission and distribution was also investigated. The results show that the Hg 0 would re-emit from desulfurization slurry, and the proportions of mercury in gas-liquid-solid three-phase were about 12.17%, 77.72% and 12.08% at typical desulfurization slurry parameter. The S(IV) concentration (sulfite and/or bisulfite concentration), temperature and pH value of desulfurization slurry had great impacts on mercury re-emission and distribution. The increase of S(IV) concentration weakened the mercury re-emission, increased the proportions of mercury in solid phase and liquid phase. The increase of slurry temperature could intensify the mercury re-emission, increase the proportion of mercury in solid phase, but decrease the proportion of mercury in liquid phase. Higher pH value was favorable for the weakening of mercury re-emission, but would increase the proportion of mercury in solid phase and liquid phase. Moreover, the introduction of Fenton reagent into desulfurization slurry could inhibit the mercury re-emission and some mercury that should be re-emitted before would be restrained in solid phase, leading a slight increase of proportion of mercury in solid phase. The existing of oxygenated free radicals , which were generated from Fenton reagent, was the main reason for the inhibition of mercury re-emission. The increase of Fe 2+ and H 2 O 2 concentration was conducive to the promotion of inhibition performance, but the effect gradually to weaken. The appropriate value of Fe 2+ concentration was 0.04 mM with the H 2 O 2 concentration of 0.30 mM in experiments. In addition, the better inhibition performance (about 80%) of Fenton reagent for mercury re-emission would be realized at lower S(IV) concentration (1–5 mM), lower temperature (30–40 °C) and lower pH value (4.0–5.0) of slurry.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2024
·Vol. 225
·期 21
·2400141
·
IF 2.5
Lan Li,Yanjun Ren,Rugang Yao,Hong Yang
To solve the downhole problems correlated with clay hydration swelling and dispersion under high-temperature conditions, a 1-aminoethyl-3-vinylimidazolium bromide ([NVim]Br) and a [NVim]Br/acrylamide copolymer (poly([NVim]Br-co-AM)) are synthesized and used as inhibitors. The molecular structures of [NVim]Br and poly([NVim]Br-co-AM) are characterized by FT-IR and 1 H-NMR. The inhibition properties of [NVim]Br and poly([NVim]Br-co-AM) are evaluated by free swelling and dispersion tests, linear swelling, hot roll recovery experiments and thermogravimetric analyses.The inhibition mechanisms were revealed by X-ray diffraction, zeta potential, wettability analysis and ESEM observation. The results showed that both [NVim]Br and poly([NVim]Br-co-AM) has significantly superior inhibition performance compared with the common inhibitors KCl, polyether amine D230 and polyquaternium-7. Both [NVim]Br and poly([NVim]Br-co-AM) can resist 250 °C. [NVim]Br performed excellently in inihibiting both crystalline and osmotic swelling, which depended on the strong electrostatic adsorption and hydrogen bonds of imidazole cations and primary amine in [NVim] + . Poly([NVim]Br-co-AM) exerted excellent inhibition by minimizing osmotic swelling, reducing hydrophilicity and increasing clay bonding. The results are important for understanding the rational design of novel efficient inhibitors for drilling high-temperature shale formation.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 9
·5803-5809
·
IF 1.093
Kong Qinghong,Zhang Yi,Zhang Xin,Xiang Bing,Yi Yanzhu,Zhu Junyu,Zhang Feng,Zhu Jia,Zhang Junhao
To endow montmorillonite with excellent flame retardancy, montmorillonite (Mt) intercalation iron compounds (Fe-Mt) were synthesized and modified by phosphorylated chitosan (PCTS) to prepare PCTS modified Fe-Mt (PCTS-Fe-OMt). PCTS-Fe-OMt was further incorporated into epoxy resin (EP)
for improving the fire safety of EP. The results revealed that the interlayer spacing of Fe-Mt was expanded by PCTS, which resulted in well dispersion of PCTS-Fe-OMt in EP matrix. The TGA results showed that EP/PCTS-Fe-OMt nanocomposites exhibited much higher residues due to the excellent
charring performance of PCTS-Fe-OMt. According to the cone calorimeter tests, the addition of 5 wt% PCTS-Fe-OMt made peak heat release rate, total heat release, peak smoke production rate, total smoke production values of EP observably decrease by 40.2%, 17.1%, 33.9% and 19.0%. Based on the
above results, the improved flame retardancy and smoke suppression properties of EP/PCTS-Fe-OMt nanocomposites were attributed to the combination of iron compounds and phosphorylated chitosan on catalytic charring, thereby promoting the formation of swollen, continuous and compact char layers
on the surface of polymer during combustion, eventually restraining the decomposition of polymers.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Gang Xie,Pingya Luo,Mingyi Deng,Junlin Su,Zheng Wang,Rui Gong,Junni Xie,Shunjie Deng,Qiang Duan
The inhibitive mechanism of low-molecular-weight branched polyethyleneimine (BPEI) with multiple primary amines and 1,6-hexamethylenediamine (HMDA) with two primary amines adsorbed on sodium bentonite (Na + Bent) has been investigated using isothermal adsorption, adsorption kinetics , scanning electron microscopy (SEM), X-ray diffraction (XRD) and elemental analysis (EA) techniques. The results indicate that as the number of primary amine groups in the inhibitor increases, the saturated adsorption amount decreases, and the adsorption rate increases. Low-molecular-weight BPEI molecules enter the interlayer space of Na + Bent and significantly reduce this space compared to that in hydrated Na + Bent. Moreover, there is no change in the clay interlayer space of Na + Bent with increasing BPEI concentration. A monolayer of BPEI intercalates into the clay interlayer and replaces the sodium ions in the interlayer. The BPEI molecules become firmly embedded in the Na + Bent interlayer between the primary amine groups and Si-O groups, resulting in the removal of water molecules. The inhibitive performance shows that BPEI inhibits clay hydration more effectively than HMDA and other inhibitors, and also indicates that as the number of primary amines increases, the inhibitive performance increases. When < 1 wt% BPEI was added, the rheological properties improved significantly, and the American Petroleum Institute standard (API) fluid loss could be controlled well, indicating that BPEI can effectively create a balance between swelling inhibition and the rheological properties of water-based drilling fluids. Overall, the results indicate that BPEI is promising as a commercial shale inhibitor.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
He Tao,Deng Zhengqiang,Li Xinliang,Luo Yufeng,Chen Lili,Ran Qihua,Ou Meng,Zhang Hehai,Tao Jiajun
Shale composed of a large amount of clay minerals is easy to swell and disperse in water, leading to wellbore instability. In recent years, adhesive shale stabilization materials have become a research hotspot because of their good bonding effect. However, many existing materials have problems such as high cost and incompatibility. In this study, polyvinyl alcohol (PVA) and tannic acid (TA) have been used as raw materials to prepare a bonding-type shale stabilizer (abbreviated as PT) for water-based drilling fluids. The shale compressive strength tests, immersion tests, linear swelling tests, and shale hot-rolling recovery tests have been used to evaluate its inhibitive performance. The results showed that the shale recovery of 3 % PT solution with a PVA/TA mass ratio of 2:1 can reach more than 90.0 %, even after hot-rolled at 150°C. In addition, the bentonite soaked in PT aqueous solution had good integrity and small volume expansion at 90°C. After immersing for 5 h, the swelling height of the bentonite sample is only 2.0 mm. Meanwhile, the compressive strength of the artificial core after soaking in 3 % PT aqueous solution at 90°C for 24 h was the highest, reaching 30.19 MPa. The rheological and filtration performance evaluation showed that PT could improve the viscosity and reduce the fluid loss of bentonite dispersion, displaying good compatibility. According to microstructure analysis, it was preferred that PVA polymer with a large number of hydroxyl groups and TA small molecules containing catechol structures in PT could form a network structure through multiple hydrogen bonding interactions, showing a strong adhesive effect. Then, PT easily adsorbed on the surface of shale or clay particles, formed a dense adsorption film on the surface to block the invasion of water molecules, and even enhanced the cementation between these particles. Finally, hydration, swelling, and dispersion of clay minerals were well inhibited, and the borewell stability was enhanced.
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
ENERGY & FUELS
·
2020
·
IF 3.421
Pan Huang,Han Jia,Yugui Han,Qiuxia Wang,Xin Wei,Qi Luo,Jiajun Dai,Jinyong Song,Hui Yan,Dexin Liu
The alkyl chain lengths of ionic liquid shale inhibitors are critical to their inhibitive properties. To design high-performance shale inhibitors with bola-form molecular structures, a series of imidazolium-based bola-form ionic liquids (IBFILs) with different spacer lengths (s), denoted as MsM (s = 2, 4, 6, 8, 10), were synthesized, and their inhibitive properties were evaluated through linear swelling tests and hot-rolling recovery tests. The results indicated that the optimized IBFILs with a proper spacer length that had six carbon atoms performed best in linear swelling rate tests and hot-rolling recovery tests. Based on the investigation of interaction modes between MsM and clay materials via contact angle measurement, ζ-potential measurement, X-ray diffraction, and molecular electrostatic potentials calculation, the possible explanation for the effects of spacer lengths on the inhibitive performance of MsM was proposed. The IBFILs with medium spacer lengths decreased the montmorillonite (Mt) ζ-potential close to zero, and the intercalated MsM in the clay interlayer acted as a binding bridge to reduce the Mt interlayer distance. This work demonstrates that the optimization of spacer lengths is crucial to the inhibitive property of IBFILs, which could be inspiring to the designing of other novel shale inhibitors.
研究领域:
材料科学
·
地质学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Shi Mo,Hong Qun Luo,Nian Bing Li
Green corrosion inhibitors are of great benefit to the protection of pipes or tanks in seawater systems. The properties of the corrosion inhibitor such as toxicity and anticorrosion performance are closely related to its molecular structure. Some thiazole derivatives are commonly known as food flavors . The influences of two thiazole flavor ingredients on Cu corrosion in NaCl solution were analyzed in this study, namely, 4-methyl-5-vinylthiazole (MVT) and 5-(2-hydroxyethyl)-4-methylthiazole (HMT). Potentiodynamic polarization and electrochemical impedance spectroscopy measurements were employed to evaluate their anti-corrosion abilities. Theoretical calculations were conducted to investigate their possible adsorption modes. The thiazole ring endows the two compounds with the high inhibition performace. However, with a conjugated system , the ethenyl has a more pronounced contribution to electron donation and adsorption ability on the Cu surface than hydroxyethyl group.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51922
·
IF 3.125
Tianqi Chen,Mengjin Chen,Chaoyang Fu
Compared with small organic molecular, polymer corrosion inhibitors exhibit better anti-corrosion performance in neutral medium because of multiple adsorption sites and temperature toleration, which are becoming the focus of scholars in the field of water treatment. However, the effect of molecular weight of polymer inhibitors is rarely studied, which has a significant impact on its performance. Polyethyleneimine (PEI) containing polar groups and numerous N atoms is a kind of water-soluble polymer which is prone to being modified, and three kinds of modified polyethyleneimine (PEPA) inhibitors are synthesized by PEI with different molecular weights (600, 1800, 10,000) in this work. The anti-corrosion performance of PEPA for Q235 carbon steel in neutral medium was evaluated by electrochemical measurements (Tafel polarization plots and electrochemical impendence spectroscopy [EIS]), weight-loss tests, and surface morphology analysis. Results of weight loss method and other measurements confirm that PEPA is an excellent polymer inhibitor, and the inhibition performance of PEPA synthesized by PEI with molecular weight of 1800 is the best with an inhibition efficiency of 94.6% at a dosage of 200 mg/L at 298 K in neutral medium.
研究领域:
材料科学
·
腐蚀与防护
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2017
·
IF 5.527
Yan Ji,Yun Chen,Jinxun Le,Mengqi Qian,Ying Huan,Wenzhong Yang,Xiaoshuang Yin,Ying Liu,Xurong Wang,Yizhong Chen
Amino trimethylenephosphonic acid (ATMP), nitrilotriacetic acid (NTA) and ethylenedinitrilotetraacetic acid (EDTA) represent the typical phosphonate and carboxylic acid scale inhibitors , respectively. In this study, the performance of the three molecules in inhibiting the formation of calcium carbonate deposition was tested by static tests. We firstly explained the mechanism of these inhibitors on the deposition of CaCO 3 using morphology analysis, crystal testing, molecular dynamics simulation and quantum calculation. We got the conclusion that ATMP showed the outstanding performance of inhibiting the deposition of calcium carbonate, due to its excellent chelate ability with Ca 2 + , the capability of preventing the layer stacking in forming calcite and the unparalleled role of inducing the lattice distortion of CaCO 3 from calcite to vaterite at very low concentration.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）