JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 24
·e53955
·
IF 3
Xiaodong Bai,Licheng Deng,Yancheng Yan,Hua Hu,Yumei Luo,Xuetong Cai
Lost circulation will cause huge economic losses every year. In order to effectively reduce the harm of lost circulation to drilling, it is particularly important to use reasonable and efficient lost circulation materials (LCM). As a kind of water-absorbing, expandable and deformable LCM, water-absorbing resin can adapt to holes and cracks of different sizes. In this study, a kind of encapsulated water-absorbing resin LCM (PMMA/PNAD) was proposed. The water-absorbing resin is synthesized by acrylamide (AM), 2-acrylamide-2-methyl-propane sulfonic acid (APMS) and diallyl dimethyl ammonium chloride (DMDAAC) as reaction monomers through aqueous solution polymerization. The shell material is polymethylmethacrylate (PMMA), which is coated on the surface of the water-absorbing resin by oil phase separation method. The results of the experimental evaluation indicate that the water-absorbing resin possesses robust water-absorbing and swelling properties, which significantly affect the rheological properties of the drilling fluid. However, the coated shell can effectively mitigate the impact of the absorbent resin on the drilling fluid. Under the formation environment of 100°C or 2 Mpa, the shell can soften or break to release the absorbent resin. The lost circulation control performance test results show that PMMA/PNAD has good pressure bearing capacity, and can still maintain good lost circulation control at 6.9 Mpa.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2024
·Vol. 15
·期 9
·1150
·
IF 3
Xinqiang Ma,Shengying Fan,Wenwen Yang,Jiajie Wei,Xiaolei Wang,Jincheng Ni,Wei Cheng,Qinhe Zhang
Perovskite as an emerging semiconductor luminescent material has attracted widespread attention due to its simple preparation, high luminescence quantum yield, high color purity, tunable spectrum, and ability to cover the entire visible light band. However, due to the influence of water or other highly polar solvents, oxygen, temperature, and radiation, perovskite nanocrystals will aggregate or collapse in the lattice, eventually leading to luminescence quenching. This study starts from the postprocessing of perovskite, uses methyl methacrylate as the monomer and TPO as the photoinitiator, and encapsulates the perovskite powder prepared by the hot injection method through ultraviolet light initiation. A method is proposed to improve the luminescence and crystal structure stability of perovskite. By eliminating the influence of environmental factors on perovskite nanocrystals through the dense structure formed by organic polymers, the resistance of perovskite to strong polar solvents such as water will be greatly improved, and it has great potential in the protection of perovskite. Finally, by changing the proportion of halogen elements in the perovskite resin to change the color of the luminescent resin, a fluorescent coating emitting light in all visible light bands is prepared. Fluorescent coatings are widely used in life and industry fields such as plastics, sol, and paper.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIRE SAFETY JOURNAL
·
2023
·
IF 3.1
Ying Zhang,Chuyuan Ma,Menglin Yang,Dachao Yuan,Kaixuan Tang,Changwei Li,Binbin Mao
The flammability and melt dripping illustrate polymer's fire risk. The high-efficiency thermal shielding effect of carbon nanotubes has been widely concerned to improve polymer's flame retardancy. However, the high thermal conductivity and wick effect of carbon nanotubes may enhance heat and mass transfer to promote fire development. A series of experiments about ignition, heat release, horizontal flame spread and dripping behaviors were carried out to comprehensively analyze the fire risk of polymer composite including polymethyl methacrylate (PMMA) and multi-walled carbon nanotubes (MWCNTs). The results showed after the addition of MWCNTs, the limiting oxygen index (LOI) increased from 18% to 20%, the peak of heat release rate (PHRR) decreased from 548 kW/m 2 to 372 kW/m 2 , and the flame spread rate (FSR) increased from 0.28 mm/s to 1.1 mm/s, respectively. These results indicate that MWCNTs decreased the ignition risk of PMMA and its heat generation, however, the fire growth rate increased sharply. That was due to the thermal shielding effect and the heat and mass transfer effect of the char layer, respectively. Therefore, the effects of MWCNTs addition on the fire risk of polymer composites need a comprehensive assessment of multiple factors including the fire growth risk.
研究领域:
材料科学
·
消防安全
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2020
·
IF 4.389
Yi-Ping Cao,Yu-Pei Xia,Xiao-Fei Gu,Li Han,Queting Chen,Gao-Ying Zhi,Dong-Hao Zhang
Here, PEI@PMMA microspheres were prepared by grafting polyethyleneimine (PEI) on poly(methyl methacrylate) (PMMA) magnetic microspheres and successfully used to immobilize lipase. The results showed that PEI@PMMA microspheres had strongly adsorbed lipase (49.1 mg/g microsphere) via electrostatic attraction. To prevent lipase shedding, the adsorbed lipase was further crosslinked with PEI on microspheres using glutaraldehyde as crosslinker. Consequently, PEI-crosslinked lipase (2.14 U/mg) exhibited 2.6 times and 1.4 times higher activity respectively than the directly covalent lipase (0.82 U/mg) and the crosslinked lipase aggregates (1.57 U/mg), which was close to the activity of adsorbed lipase (2.20 U/mg). Conformational analysis from FTIR spectroscopy showed that PEI-crosslinked lipase retained its natural structure well. And the α-helix structure seemed to play a key role in enhancing lipase activity. Furthermore, the effects of various parameters on crosslinking reaction were investigated. Also, PEI-crosslinked lipase revealed higher pH and thermal stability. The Michaelis constant ( K m ) was increased and the optimum temperature of lipase was widened observably after crosslinking with PEI on PEI@PMMA magnetic microspheres.
研究领域:
生物化学
·
酶工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2016
·Vol. 54
·期 13
·2040-2049
·
IF 3.114
Tao Qian,Juanjuan Wang,Tiantian Cheng,Xiaoli Zhan,Qinghua Zhang,Fengqiu Chen
The poly(methyl methacrylate) -b- poly(2-[[[[2-(perfluorohexyl)]-sulfonyl]-amino]ehthyl] methacrylate) (PMMA -b- PC 6 SMA) copolymers were successfully synthesized for the first time using activator regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) method. Under optimized reaction conditions, the degree of polymerization (DP) of resulting copolymers increased approximately linearly with monomer conversion. Structures of a well-defined block copolymer were determined by GPC, FT–IR, and 1 H-NMR spectra. Results from AFM and contact angle measurements of polymer films revealed the presence of block segments derived from PC 6 SMA, as indicated by the obvious increase in hydrophobicity and oleophobicity. The relationship between surface composition and surface wetting ability was confirmed by XPS and AFM spectra. Compared with the random copolymer PMMA -co- PC 6 SMA, C 6 SMA dosages in the PMMA -b- PC 6 SMA copolymers were greatly decreased, which retained its hydrophobic and oleophobic properties. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54 , 2040–2049
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2023
·
IF 3.2
Liu Zheng,Liu Yuxin,Zheng Wenbin,Ding Yang,Liu Wenjun,Wen Yu,Guo Hongxuan,Hou Jixin
The cleanliness of transferred graphene is crucial for its application in various fields. The presence of residues of polymethyl methacrylate (PMMA) on the surface of transferred graphene has a negative impact on its transparency, transport, and other critical properties. In this study, we propose an alternative method to reduce such residues by using acetic acid instead of the commonly used acetone. The effects of treating graphene with acetic acid and acetone are comprehensively evaluated through optical microscopy, scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The results of this study demonstrate a significant reduction in surface residue when graphene is treated with acetic acid, compared to acetone treatment. Additionally, we applied this method to fabricate graphene-based supercapacitors and compared the results using acetic acid and acetone. This reduction in residue holds great promise for advancing the development of high-quality graphene devices.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Hui Liang,Dandan Chen,Damien Thiry,Wenjiang Li,Minfang Chen,Rony Snyders
High-energy density and low cost magnesium nanoparticles (Mg NPs)-based material are being sought to meet increasing capable of hydrogen (H 2 ) storage demand. Here, a kind of air-stable Mg NPs supported on porous structured multi-walled carbon tubes-polymethyl methacrylate (MWCNTs-PMMA) template is prepared owing to reversible well-distributed, dispersed and small-sized Mg/MgH 2 NPs. The aim is to improve the H 2 storage capacity, hydrogen sorption kinetics and thermodynamics of nano Mg-based system without using catalyst. The organic Mg precursor was directly in-situ reduced to metallic Mg NPs in MWCNTs-PMMA template by lithium naphthalide. The size distribution of reduced Mg nanoparticles is around 3.6 ± 0.2 nm, confirmed by XRD and TEM analyses, which is due to the strong interaction between Mg NPs and MWCNTs-PMMA via PMMA binding Mg 2+ , as well as the confinement of porous template hindered the growth and agglomeration of Mg NPs. Moreover, except H 2 , O 2 and H 2 O molecules can't infiltrate the porous structure of MWCNTs-PMMA resulted in the presence of air stable Mg NPs in the MWCNTs-PMMA. The work provides a new scope to prepare nano metal-based composite for H 2 storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2018
·Vol. 51
·期 40
·405103
·
IF 2.373
Xi Cheng,Chengjun Qi,Wei Ding,Jingwen Lu,Xiaoming Mo,Yulu Zhou,Tao Lin,Xiaoma Tao,Hongmei Chen,Yifang Ouyang
Organic–inorganic hybrid perovskites are emerging as promising light-emitting materials due to their superior photophysical properties. Poor surface coverage creating substantial pinholes and shunt paths, nevertheless, is one of the most severe problems that hinder the further development of perovskite light-emitting diodes (PeLEDs). Here in this work, we demonstrated a fabrication of PeLEDs by using a robust, stable, and highly transparent poly(methyl methacrylate) (PMMA) polymer to passivate the pinholes of CH3NH3PbBr3 emissive layer and hence reduce the non-radiative losses through the shunt paths formed by the pinholes. Uniform surface coverage and reduced leakage current were achieved. Green electroluminescence (EL) emission centered at ~534 nm was greatly boosted by a factor of 10 at 8 V with optimizing the thickness of the PMMA modifier. This facile and universal technique provides an effective way to circumvent the poor formation of the CH3NH3PbBr3 perovskite film and may be very helpful in the development of PeLEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·Vol. 48
·期 11
·4339-4348
·
IF 7.139
Ke Li,Tongwen Huang,Yunhe Gao,Chengshang Zhou
Oxidation of hydrogen storage alloy leads to the formation of a passive surface oxide layer , which deteriorates its performance. This study introduces a method utilizing polymethyl methacrylate (PMMA) nano-coating to improve the antioxidant properties of hydrogen storage alloys, including LaNi 5 , TiMn 2 , and Mg 2 Ni. PMMA nano-coating was achieved using a solution immersion method. The results show that the PMMA-coating promotes a stable capacity, kinetics, and thermodynamic properties compared to those of uncoated alloys. After 168 h of air exposure, the hydrogen storage capacities of PMMA-coated LaNi 5 , TiMn 2 , and Mg 2 Ni alloys show minor decreases. Moreover, cycling tests demonstrate that PMMA-coated LaNi 5 and PMMA-coated Mg 2 Ni have good cyclic stabilities. Our results show that the PMMA coating provides effective protection for variant hydrogen storage alloys from oxygen contamination and oxidation.
研究领域:
材料科学
·
氢能
·
表面涂层技术
·
腐蚀防护
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Yuanping Zhang,Boyu Ma,Xinlei Jia
Melamine polyphosphate (MP), a halogen-free flame retardant was utilized to prepare flame retardant enhanced montmorillonite (MP-MMT), which was introduced into polymethyl methacrylate (PMMA) by emulsion polymerization to improve its heat resistance and flame retardancy. The decorated PMMA were characterized by SEM, FTIR, XRD, and XPS, indicating that MP-MMT/PMMA composites were successfully prepared. The resulting composites exhibited excellent heat resistance, the temperature at maximum weight loss rate was increased from 360 °C to 377 °C, and the char residue at 500 °C was increased to 1.93%. In addition, the LOI value of PMMA composite system was increased from 17.2% to 22.4%, and MP-MMT/PMMA-3 achieved UL-94 V-1 rating. Compared with pure PMMA, the total heat release and peak heat release rate of MP-MMT/PMMA were reduced by 23.0% and 32.4%, respectively. The total smoke release of the optimal flame-retardant PMMA resin decreased by 22.1%, the CO production increased slightly, and the CO2 production decreased significantly. This indicates that the incorporation of MP-MMT has a good effect on flame retardancy. Finally, the flame retardant mechanism of MP-MMT to inhibit PMMA combustion was analyzed. The intercalation modification of MMT is potentially valuable for flame retardant studies of PMMA.
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
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 47
·2105771
·
IF 18.808
Fei Zhang,Wenqing Liang,Lintao Wang,Zhuangzhuang Ma,Xinzhen Ji,Meng Wang,Yue Wang,Xu Chen,Di Wu,Xinjian Li,Yu Zhang,Chongxin Shan,Zhifeng Shi
Hydrochromic materials have attracted widespread attention in the fields of anti-counterfeiting because of their ability of the reversible light absorption and/or emission properties in response to water. Here, for the first it is demonstrated that the ternary copper halides Cs 3 Cu 2 I 5 nanocrystals (NCs) possess excellent hydrochromic properties. The prepared Cs 3 Cu 2 I 5 NCs films can dynamically extract and insert CsI by exposing/removing water to realize the reversible conversion between blue-emissive Cs 3 Cu 2 I 5 and yellow-emissive CsCu 2 I 3 . Interestingly, polymethyl methacrylate (PMMA) coated Cs 3 Cu 2 I 5 can effectively avoid the extraction of CsI and maintain long-term stability in the water. Further, the hydrochromic Cs 3 Cu 2 I 5 and water-resistant Cs 3 Cu 2 I 5 @PMMA are used as the inks to synergistically act on anti-counterfeiting information to achieve multiple encryption effects, which can clearly identify and authenticate the effective information after moisture decryption. Importantly, the pattern can be re-encrypted to the invalid pattern after water evaporation. In addition, the anti-counterfeiting pattern has excellent stability during repeated encryption/decryption conversion cycles, which can not only balance the accessibility of anti-counterfeiting information but also effectively improve the security of information. This new discovery may not only deepen the understanding of Cs 3 Cu 2 I 5 but also provide new options for the design of hydrochromic materials for anti-counterfeiting information.
研究领域:
材料科学
·
光学
·
防伪技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 6
·1-14
·
IF 23.2
Zhao Xiaotong,Du Peng,Qiu Fei,Hou Yuanlang,Lu Hanxiao,Zhang Jiemin,Geng Xiangshun,Dun Guanhua,Chen Sisi,Lei Ming,Ren Tian-Ling
The drive to deliver ever-more powerful and feature-rich organic integrated circuits has made the interface contact quality improvement—that is, the process of alleviating the hysteresis phenomenon and contact resistance of the electrical properties in organic field-effect transistors (OFETs)—a critical challenge for the organic semiconductor (OSC) microelectronics industry. The use of blends of OSCs and insulating binding polymers has offered a breakthrough to circumvent these limitations. Here, we introduced a novel method for preparing high-performance OFETs based on a direct-writing inkjet printing (DWIP) blend composed of 6,13-bis(triisopropylsilylethinyl) pentacene (TIPS-pentacene) and poly(methyl methacrylate) (PMMA). The small molecular weight of PMMA imparted significantly superior crystallization of small-molecule OSCs, and the OFETs exhibited better electrical performance than other comparative conditions. The crystallization and characteristics improved because of two mechanisms: First, the PMMA delivered superior mechanical strength, stability, and improved film uniformity and created a more uniform interface that decreased the charge accumulation, thereby alleviating the hysteresis and contact resistance. Second, combined with DWIP technology and thanks to the advantages of horizontal solution shearing and spatially restricted domains, the blends contributed to solute draw and thus handled mass transport more efficiently and controllably. The proposed method provides attractive properties for industrial applications.
研究领域:
材料科学
·
电子工程
·
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）