POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 1
·e6289
·
IF 3.1
Zhigang Yuan,Mingming Sun,Xugang Zhang,Mehdi Derradji,Bin Zhang,Jianhui Li,Ming Zhao,Caizhao Liu,Shuangle Xue,Bo Liu
In this work, this study aimed to overcome the inherent disadvantage of low thermal stability and brittleness of epoxy resins. A novel modifiers containing alkynyl- and allyla- groups, (E)-1-(4-(allyloxy)-3-methoxyphenyl)-N-(3-ethynylphenyl)methanimine (MNEM) was prepared and confirmed by Fourier transform infrared spectroscopy (FTIR) and 1 H-nuclear magnetic resonance ( 1 H NMR), and selected to improve the thermal stability and toughness of bisphenol A-type epoxy resin (E51). The blend resins were produced by blending with different contents of MNEM into E51 resin, named E-MNEM resins. Meanwhile, the thermal stability, mechanical properties, and micromorphology of E-MNEM blends were analyzed in details. It was found that the thermal stability of E-MNEM resins was improved by increasing the proportion of MNEM. Compared with E-0MNEM resin, when the MNEM concentration reached 40 wt%, the char yield ( Y c ) increased from 14.95 to 29.62%, reflecting a 98.1% improvement. In addition, an appropriate concentration of MNEM could be conductive to improving the mechanical properties. An improvement of 25.5 and 7.1% in elongation and tensile strength along with the maximum value of 17.6 kJ/m 2 for the impact strength was achieved by the cured E-MNEM resins containing 20 wt% of MNEM. Finally, the fracture surface morphology of the E-MNEM resins was analyzed by the scanning electron microscope (SEM).
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
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Ming Li,Liwei Zhu,Honggang Xiao,Tao Shen,Zhuotao Tan,Wei Zhuang,Yuebin Xi,Xingxiang Ji,Chenjie Zhu,Hanjie Ying
This work designed a lignin-based reinforcing agent for reinforcing natural rubber (NR) via building up an integrated interfacial network. A facile lignin modification approach was developed using a cyclic anhydride with a long alkene chain, (2-dodecen-1-yl)succinic anhydride. The grafting of the modifiers preferentially takes place at the aliphatic −OH sites as indicated by 2D heteronuclear single-quantum coherence and 31P NMR spectra. The amount of grafted modifier was estimated via TGA, being 27.1 and 48.8 wt % for the two modified lignin samples. The high degree of modification results in an elevated molecular weight, reduced Tg, and improved hydrophobicity. The NR composites show comparable mechanical properties when 30 wt % of carbon black was replaced with modified lignin. The modification of lignin generates more −COOH groups, which facilitates coordination interactions, and the introduction of zinc dimethacrylate imparts further improved mechanical properties beyond the counterpart with carbon black, especially for the stress at low deformation. Stress relaxation and cyclic tensile tests reveal that these composites are able to largely keep and recover the network structure due to the coordination interaction. This work provides a versatile lignin-based reinforcement for more sustainable and higher-performance NR composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 18
·3120
·
IF 4.329
Xianfeng Tan,Longchen Duan,Weichao Han,Ying Li,Mingyi Guo
To overcome the negative impact on the rheological and filtration loss properties of drilling fluids caused by elevated temperature and salts contamination, which are common in ultradeep or geothermal drilling operations, it is imperative to develop highly efficient additives used in the water-based drilling fluid. In this study, a zwitterionic copolymer P (AM/DMC/AMPS/DMAM, ADAD) was synthesized by using acrylamide (AM), cationic monomer methacrylatoethyl trimethyl ammonium chloride (DMC), anionic monomer 2-acrylamide-2-methyl propane sulfonic acid (AMPS), andN,N-dimethylacrylamide (DMAM) through free radical copolymerization. The copolymer was characterized by1H Nuclear Magnetic Resonance (NMR), Fourier transform infrared spectroscopy (FTIR), elemental analysis, thermogravimetric analysis (TGA), and zeta potential. The rheological behavior, filtration properties, and the performance exposure to salt or calcium contamination in water-based drilling fluid were investigated. The bentonite/polymer suspension showed improved rheological and filtration properties even after aging at 160 °C or a high concentration of salt and calcium. The filtration loss can be greatly reduced by more than 50% (from 18 mL to 7 mL) by the inclusion of 2.0 wt% copolymer, while a slight increase in the filtrate loss was observed even when exposed to electrolyte contamination. Particle size distribution and zeta potential further validate the idea that zwitterionic copolymer can greatly improve the stability of base fluid suspension through positive group enhanced anchoring on the clay surface and repulsion force between negative particles. Moreover, this study can be directed towards the design and application of zwitterionic copolymer in a water-based drilling fluid.Keywords:zwitterionic copolymer;rheology modifier;fluid loss agents;drilling fluid
研究领域:
石油工程
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 15
·8654-8663
·
IF 3.049
Chen Xu,Taoguang Qu,Xiaojie Zhang,Xiongwei Qu,Nongyue Wang,Qingxin Zhang,Beckry Abdel-Magid,Guohua Li
A new epoxy-based composite with higher toughness and thermal conductivity was developed. First, a poly(n-butyl acrylate)/poly(methyl methacrylate-co-glycidyl methacrylate) (PBMG) core–shell structured latex was prepared by seeded emulsion polymerization to toughen the epoxy resin (EP). Second, boron nitride particles were modified into nano-scale sheets and added to the epoxy/PBMG blend to improve the thermal conductivity of the resulting composite material. The properties of the constituent materials were determined prior to fabrication and testing of the composite product. The monomer conversion in the emulsion polymerization process of the PBMG was checked by determining the solid particle content. The PBMG particle size was characterized by dynamic laser scattering, and the morphology of the particles was characterized by scanning and transmission electron microscopy. The exfoliation of the modified boron nitride (MBN) flakes was verified by TEM and Raman microscopy. The mechanical properties and the thermal conductivity of the EP/PBMG/MBN composite were determined at various constituent contents. Results showed that the unnotched impact strength of the composite increased by 147%, the flexural strength increased by 49.1%, and the thermal conductivity increased by 98% compared with pristine EP at a PBMG content of 5 wt% and MBN content of 7 wt%. With the enhanced properties and ease of fabrication, the developed composite has good potential for application in high-end industries such as microelectronics packaging.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PETROLEUM SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.07
Weichao Du,Yongfei Li,Bo Yun,Jie Zhang,Rongjun Zhang,Gang Chen
In this paper, four novel cyclohexanone-alcohol hemiketals (KL-1, KL-2, KL-3, KL-4) as waxy crude oil flow improver have been prepared by cyclohexanone and 1-pentanol, 1-Hexanol, 1-heptanol, 1-octanol. Evaluation results demonstrate the hemiketal compounds have obvious effect on the viscosity and pour point of Henan crude oil. DSC analysis showed that waxing point and waxing peak decreased to a certain degree in 0.05% hemiketal solutions. Wax crystal morphology analysis indicated the four hemiketals played a role of nucleation in the process of waxy crude oil decoagulation, and in that way acts as waxy crude oil flow improver.
研究领域:
石油化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2015
·Vol. 30
·期 1
·175-180
·
IF 0.399
Liu Jiaping,Chen Xiang,Hong Jinxiang,Liu Zhifei
The phenolic emulsifiers used in emulsified asphalt of micro-surfacing, which was the most important tools in the road maintenance, were investigated by control technology. Many factors influencing this reaction were studied and three kinds of phenolic emulsifiers were prepared without catalyst in ethanol. The performance was researched that 2-({2-[2-(2-Amino-ethylamino)-ethylamino]-ethyl-amino}-methyl)-4-nonyl-phenol (abbreviated as TETA) could be used in micro-surface. With addition of 0.5 % demulsifier, the mixing time was extended to 120 seconds obviously, and the cohesion torque (60 min) was 2.8 N*m, which satisfied the opening traffic time shorter than 1 h. The wet track abrasion (6 d) was lower than 807 g/m 2 , with interfacial modifier added, but the load wheel was increased with interfacial modifier increasing. When the TETA: demulsifier: interfacial modifier =3:1:3, excellent performance was obtained and the experimental results met the International Slurry Surfacing Association (ISSA) standard. The synthesis process of this emulsifier is simple and the performance used in micro-surface was excellent, so this kind of emulsifier could have a better application future.
研究领域:
化学工程
·
道路工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Bin Sun,Fengfei Chen,Hualin Lin,Yuan Xue,Sheng Han
The poor cold flow properties (CFPs) are the main factors that hinder the utilization and popularization of diesel fuel. Cold flow improvers (CFIs) are usually add to diesel fuel to compensate for liquidity problems at low temperatures. In this study, monomers with different functional groups were used to synthesize methyl benzyl acrylate-co-hexadecene-maleic anhydride (MB-HD-MA) terpolymers with different mole ratios through free radical polymerization , and then the terpolymers were modified with tetradecanol to obtain comb type terpolymers (MB-HD-MA-C14). The structure of MB-HD-MA and MB-HD-MA-C14 were characterized by Fourier transform infrared spectroscopy (FTIR) and Nuclear Magnetic Resonance Hydrogen spectra (1 H NMR). Adding CFIs to diesel fuel effectively improved the CFPs, 1000 ppm MB-HD-MA-C14 (3:1:4) presented the best depression effects on cold filter plugging point (CFPP) and solid point (SP) by 12 °C and 21 °C, respectively. The results showed that the non-polar and polar components in CFIs exert synergistic effect at an optimal ratio to improve CFPs with greater efficiency. Moreover, rheology analysis and polarizing optical microscopy showed that MB-HD-MA-C14 (3:1:4) can improve the rheological properties by reducing dynamic viscosity and improve the crystallization behavior of wax crystals at low temperature by decreasing the size and modifying the morphology of the wax crystals.
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
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Ziqi Zhu,Pei Yang,Wentao Huang,Xiaoyan Zhou
Modifications of urea-formaldehyde (UF) resin to achieve better bonding performance and lower formaldehyde emission are still an alluring task in the wooden composite industry. Herein, by strategically constructing a photocatalytic oxidation system relying on carbon dot-catalyzed peroxymonosulfate (PMS) activation, we confirmed that Kraft lignin can be readily oxidized to potent modifiers for improving the bonding performance of low-molar-ratio UF resin (F/U = 0.95). We found that the oxidation system consisting of carbon dots and PMS in a mass ratio of 1:20 revealed optimal efficiency in the oxidative valorization of lignin by primary cleavage of β–O–4 linkages, resulting in a remarkable reduction of molecular weight from 2026 to 679 Da. Meanwhile, lignin side-chain oxidation triggered by radicals (mainly involving sulfate radicals) also contributed largely to the transformation of S units to G and H units via demethoxylation, and the reaction patterns conferred the oxidation products an increased amount of aliphatic OH and phenolic OH. In comparison with untreated lignin, the lignin-degraded fragments promised relatively higher hydroxymethylation efficiency and enhanced chemical compatibility in the UF resin synthesis system, fostering the formation of copolymers containing phenolic-like moieties and branched polymer structures. Profiting from this structurally homogeneous modification of oxidized lignin, the copolymer resin not only revealed comparable storage stability to the UF resin but also possessed enhanced bonding performance on the premise of rather low formaldehyde emission, and plywood panels bonded with the lignin-modified resin exhibited a higher tensile shear strength of 0.81 MPa, which was a 58.8% increase with reference to the UF resin-bonded panels, and as a result complied with the relevant national standard (≥0.7 MPa). Overall, the lignin photocatalytic oxidation strategy proposed in our study would open a new avenue for providing biobased and potent modifiers in the production of wood adhesives.
研究领域:
林业科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Qingyun Lu,Qianqian Fan,Fengfeng Zhang,Jiahui Li,Qi Cao,Xigao Jian,Zhihuan Weng
Toughening epoxy resins with modifiers without compromising their modulus and mechanical strength poses a significant challenge. In this work, a bio-based N-heterocyclic-containing reactive toughening agent, HPESZ, was synthesized based on cinnamon derivatives and succinic anhydride. And then the HPESZ was incorporated into the bisphenol A epoxy resin/4, 4′-diaminodiphenylmethane (E44/DDM) curing system to evaluate its effect on the toughening of epoxy resins. The results suggested that the impact strength of the E44/5 %HPESZ/DDM blended system achieved a peak value of 72.4 kJ m −2 , representing a 90.0 % increase over the E44/DDM system (38.1 kJ m −2 ). Subsequently, the toughened system was characterized using scanning electron microscopy and atomic force microscopy to explain its phase structure and toughening mechanism. The cured system produced the chemically induced microphase separation, and the presence of epoxide groups and terminated hydroxyl groups enhanced the interfacial compatibility of E44/DDM, thereby increasing the impact strength. Moreover, the flexural strength, flexural modulus, hardness, and Young's modulus of the blended system were also improved simultaneously. In conclusion, HPESZ is a reactive bio-based toughening agent with promising practical applications.
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
ENERGY & FUELS
·
2018
·
IF 3.024
Yongfei Li,Yanling Wang,Jiafeng Jin,Kun Wang,Longhao Tang,Yue Zhang,Gangxiao Wang,Caili Dai
It is well-known that shale gas production is affected by the wettability of the reservoir. In this work, two gas-wetting alteration agents were synthesized and characterized by 1H NMR and FTIR. To evaluate the effect of the gas-wetting alteration agents on the shale wettability, the contact angle for droplets on the shale surface was detected, and the results showed that the contact angles of water and n-hexadecane increased from 36° and 0° to 119° and 88° after treatment with sodium [N-propyl-N-(perfluorooctanoyl)amino]acetate (SCF-102), while the contact angles increased to 122° and 110°, respectively, after treatment with sodium [N-[[N-(perfluorooctanoyl)amino]ethyl]amino]propionate (SCF-113). The surface free energy rapidly decreased from the primeval 72 to 10.3 and 6.8 mN/m at equal concentration. These values agreed with the results of spontaneous imbibition, the capillary tube rise test, and the fluid flow test. Additionally, the analysis with energy dispersive spectroscopy and scanning electron microscopy revealed that the fluorine-containing adsorption layer was formed and the roughness of the shale surface was significantly increased. This indicated that the gas-wetting surface can be achieved by using the gas-wetting alteration agents. The above results confirmed that the wettability of the shale surface is altered from the original water-wetting or oil-wetting to gas-wetting. Furthermore, the thermal analysis exhibited that the two gas-wetting alteration agents have good thermal stability under 165 and 216 °C, respectively. It demonstrated that they have greater potential to be applied to high-temperature reservoirs.
研究领域:
石油工程
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2021
·
IF 6.141
Jian Chen,Min Qiao,Nanxiao Gao,Jingzhi Wu,Guangcheng Shan,Bosong Zhu,Qianping Ran
In this work, post-acting polymers were utilized as novel viscosity modifying admixtures (VMAs) for the first time. A series of the random terpolymers containing anionic acrylic acid (AA), nonionic hydroxypropyl acrylate (HPA) and N, N-dimethyl acrylamide (DMAA) was synthesized. By changing the concentration of initiator, the copolymers with different acrylate segment (HPA) contents and similar molecular weights were obtained. The adsorption, fluidity, bleeding and rheological properties of the cement paste containing different copolymers have been discussed. The effects of the acrylate segments of the copolymers on the properties of cement paste were studied. The results show that the post-acting polymers are hydrolyzed and adsorb on the cement particle surface gradually, meanwhile decrease the bleeding and stabilize the cement paste slowly. The viscosity modifying effects of the post-acting polymers on cement enhance gradually and maintain for a long time.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Yongfei Li,Yanling Wang,Qian Wang,Longhao Tang,Lin Yuan,Gangxiao Wang,Ren Zhang
Wettability alteration of condensate gas reservoirs is very important for improving the productivity of condensate wells. In this work, a novel gas-wetting alteration agent was synthesized by emulsion polymerization . The synthesis process conditions were optimized by the response surface methodology based on the yield of the product. Wettability alteration effect of the polymer was evaluated by the contact angle method and the Owens two-liquid method. Experimental data showed that the effect of temperature on yield is significantly greater than the other two factors. The most preferred synthesis parameters were as follows: a reaction temperature of 80 °C, a molar ratio of acrylic acid to perfluorooctylethyl acrylate of 2.5:1 and 0.06 g of potassium persulfate. Under such optimal specifications, the test yield (84.36%) was almost close to the predicted yield (83.66%). Furthermore, the contact angle of water and n-hexadecane on the core surface increased from 34° and 0° to 126° and 102° after treated by 1.5 wt.% polymer solution . The surface free energy reduced from 73 mN/m to 8.2 mN/m at equal mass fractions. These values were verified by spontaneous imbibition . The results proved that the core has been rendered hydrophobic and oleophobic properties after being treated with the synthesized gas-wetting alteration agent.
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
危险品化学品经营许可证（带存储）