Chemistry-An Asian Journal
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2023
·
IF 4.1
Zuoliang Wang,Guangfei Qu,Yuanchuan Ren,Xiuping Chen,Jun Wang,Ping Lu,Minhua Cheng,Xiaomei Chu,Yongheng Yuan
Graphical An environmentally friendly intelligent Fe 3 O 4 @PMMA@PDMS superhydrophobic oil-absorbing material was prepare in a simple process and the effects of different particle sizes of Fe 3 O 4 , different concentrations of PDMS, and different heating times on the superhydrophobicity of the coating investigated. We prepared an environmentally friendly intelligent Fe 3 O 4 @PMMA@PDMS superhydrophobic oil-absorbing material with simple process and excellent performance, and investigated the effects of different particle sizes of Fe 3 O 4 , different concentrations of PDMS, and different heating times on the superhydrophobicity of the coating. The best performance of the coating was achieved at a particle size combination of 20/500 nm for Fe 3 O 4 , a PDMS to Fe 3 O 4 @PMMA mass ratio of 6 : 1, and a heating time of 2 min at 400 °C. H2-SPSS coating not only has excellent superhydrophobicity, abrasion resistance, self-cleaning property, and chemical corrosion, but also has good flux and efficiency for separating oil-water mixture, with fluxes of 40,540, 32,432, and 37,027 Lm −2 h −1 for trichloromethane, dichloromethane and bromoethane, respectively, and separation efficiencies of 99.78 %, 99.74 % and 99.73 %, respectively. In addition, we also prepared a superhydrophobic magnetic polyurethane (SPPU) sponge using Fe 3 O 4 @PMMA@PDMS, which not only has a good oil absorption capacity of 18–44 g/g for different oil substances, it can also move directionally by magnet attraction and absorb oil along a fixed path. Under the control of the magnet, SPPU completes the whole oil absorption process in only 4 s, showing excellent oil absorption and intelligence.
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Nanomaterials
·
2023
·Vol. 13
·期 6
·1085
·
IF 5.3
Qingchao Zhou,Zhongyi Shang
The commercial application of colloidal semiconductor nanocrystals has been realized owing to the development of composite film technology. Here, we demonstrated the fabrication of green and red emissive CuInS2nanocrystals embedded polymer composite films of equal thickness by using a precise solution casting method. The impacts of polymer molecular weight on the dispersibility of CuInS2nanocrystals were then systematically studied through evaluating the decrease in transmittance and red shift of emission wavelength. The composite films made from PMMA of small molecular weights exhibited higher transmittance. Applications of these green and red emissive composite films as color converters in remote-type light-emitting devices were further demonstrated.Keywords:CuInS2nanocrystals;PMMA;composite films;molecule weights;white LEDs
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FIRE SAFETY JOURNAL
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2022
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IF 3.78
Ying Zhang,Menglin Yang,Dachao Yuan,Changwei Li,Yongfei Ma,Shuai Wang,Shasha Wang
Due to their environmentally friendly features, expandable graphite (EG) and carbon nanotubes (CNT) were widely used as an additive in the field of flame-resistant polymers. However, the addition of EG or CNT improves heat and mass transfer in polymers, which in theory might hasten the rate of flame spread and hence raise the fire danger associated with polymers. Thus, LOI, CCT , and horizontal flame spread tests were carried out to comprehensively reveal the effects of the addition of EG and MWCNT on the fire risk of thermoplastic polymers. Results show that EG and MWCNT were antagonistic when functioning in PMMA together, despite the fact that both of them had good effects on flame retardancy when acting in PMMA alone. Additionally, the addition of EG and MWCNT to the PMMA increases the flame height and hastens the flame spread. The comparison of results between LOI with CCT and the flame spread test shows the addition of flame retardants in thermoplastic polymers will diminish the hazard of fire ignition and heat release while raising the hazard of flame spread, which suggests the fire hazard of thermoplastic polymers with flame retardants deserve comprehensive assessment when new types of flame retardants to be created.
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Materials
·
2022
·Vol. 15
·期 19
·6553
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IF 3.748
Yuan Zhao,Tian Liang,Pengpai Miao,Tao Chen,Xiaobing Han,Guowen Hu,Jie Gao
The modification of polymers can significantly improve the ability to remove rare earth ions from wastewater, but so far few studies have focused on the irradiation-induced grafting method. In this study, a novel magnetic chelating resin for Ce(III) uptake was first synthesized by suspension polymerization of PMMA@Fe3O4microspheres followed by irradiation-induced grafting of glycidyl methacrylate (GMA) and subsequent amination with polyethyleneimine (PEI). The FT-IR, SEM, TG and XRD characterization confirmed that we had successfully fabricated magnetic PMMA-PGMA-PEI microspheres with a well-defined structure and good thermal stability. The obtained adsorbent exhibited a satisfactory uptake capacity of 189.81 mg/g for Ce(III) at 318.15 K and an initial pH = 6.0. Additionally, the impact of the absorbed dose and GMA monomer concentration, pH, adsorbent dosage, contact time and initial concentration were thoroughly examined. The pseudo-second order and Langmuir models were able to describe the kinetics and isotherms of the adsorption process well. In addition, the thermodynamic data indicated that the uptake process was spontaneous and endothermic. Altogether, this research enriched the Ce(III) trapping agent and provided a new method for the removal rare earth pollutants.Keywords:magnetic PMMA microspheres;PEI;radiation induced grafting;Ce(III) adsorption
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JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 24
·11274-11288
·
IF 4.682
Yang Bin,Yang Yingdong,Xu Xiang,Ke Yuchao,Pan Yang,Su Lifen,Wang Yingying,Wang Shuqing,Qian Jiasheng,Xia Ru,Fu Enfa
Lithium-ion batteries (LIBs) have attracted more and more attention in recent years because of their renewable, clean energy and high-cost performance. Polyvinylidene fluoride (PVDF) and polymethyl methacrylate (PMMA) were expected to be used in the preparation of LIB separator due to their excellent comprehensive properties. In this work, a series of PVDF/PMMA LIB separators were prepared by thermally-induced phase separation (TIPS), which is a simple method of fabricating microporous films. In order to improve the comprehensive performance, SiO 2 was adopted to modify the composite films with various filling proportions by solution method. Results of DSC and XRD tests showed that SiO 2 nanoparticles could significantly reduce the crystallinity of the films, but hardly changed the morphology of PVDF. With an increase in SiO 2 content, both porosity and electrolyte uptake rate for the composite films increased, but an excessive loading of SiO 2 tended to agglomerate inside the films. The porosity and electrolyte uptake rate for composite film containing 3% SiO 2 were found to be the highest. As SiO 2 loading increased, both first charge–discharge capacity and efficiency of the composite films were enhanced with the discharge cycle stability enhanced simultaneously. When 3% SiO 2 was incorporated, the PVDF/PMMA/SiO 2 composite film displayed the best comprehensive performance of the battery among all film samples examined. This study presents a facile way of manufacturing LIB separators with relatively ideal overall battery performance.
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OPTICS EXPRESS
·
2022
·Vol. 30
·期 12
·20241-20249
·
IF 3.833
Hao Chen,Rui Wang,Wenqiang Ma,Huanhuan Zhang,Lin Yang
The large-scale and continuous production of CsPbBr3@PMMA composite film is realized by the in-situ ultrasonic spray coating method at room temperature. Through embedding CsPbBr3 nanocrystals into the hydrophobic polymer framework, the as-fabricated films (20 cm × 20 cm) exhibit uniform green emissions with a relatively high PLQYs of 76%, and could maintain 80% PL intensity after 3 months storage under ambient conditions. Assembling the green-emissive CsPbBr3@PMMA film and the red-emissive KSF@PMMA film with blue LED chip, a high-performance LCD is obtained, reaching a higher saturation with 126% and 94% color gamut of NTSC and Rec.2020, respectively. This work demonstrates that ultrasonic spray coating technique could be widely used in the large-scale fabrication of uniformly high-quality perovskite films for backlight application.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 19
·195709
·
IF 3.874
Shiqiang Song,Qinglan Li,Cuifen Zhang,Zijin Liu,Xin Fan,Yong Zhang
Achieving a balanced strength-toughness in polymer composites is a challenge largely because of poor interfacial interaction between the fillers and matrix. Here, we report that terpolymer grafted multi-wall carbon nanotubes (Ter-CNT) imparted good dispersion of CNT in matrix and strong CNT-matrix interaction. With the addition of 2 vol% filler into polymethyl methacrylate (PMMA) matrix, the composite exhibited simultaneously a balanced strength-toughness property with flexural strength of 72.3 MPa, toughness of 10.1 MJ m−3, which increased by 40.1% and 578% compared with those of pure PMMA. In addition, the composite also shows a high static contact angle (110.3°), and thermal conductivity (0.50 Wm K−1), which endow the composite with good self-cleaning and thermal management capabilities. Thus, this preparation process shows guidance for the design of polymer composite with integrated high strength-toughness, thermal conductivity and good self-cleaning.
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POLYMER COMPOSITES
·
2024
·
IF 4.8
Weiji Li,Xinrui Yan,Lu Ye,Changning Ran,Yue Zhang,Ruiqi He,Bixuan Zhu,Yu He,Jiacheng Guo,Hongwei Li,Jianjun Zhang,Sude Ma
In this paper, the carboxylic acid modifier 2,3,4,5-tetrafluorobenzoic acid (F4C) was used to modify the BaTiO 3 (BT) nanoparticles, which acted as a coupling agent. The modified BT(F4CBT) nanoparticles, polyvinylidene fluoride (PVDF), and polymethylmethacrylate (PMMA) were used to make the modified nanocomposite films: PVDF/PMMA-F4C-BaTiO 3 nanocomposite films. The unmodified BT nanoparticles were used to make the unmodified nanocomposite films: PVDF/PMMA-BaTiO 3 nanocomposite films. The modification effect of the F4C resulted in an increase in the amount of β-phase and γ-phase, a decrease in the amount of α-phase, and a decrease in the overall crystallinity of the PVDF-based nanocomposite films. The dielectric constant of the PVDF/PMMA-F4C-BaTiO 3 nanocomposite films reached a maximum value of 16.7 at a frequency of 100 Hz at 4 wt% F4C, which was 40.3% higher than that of the unmodified PVDF/PMMA-BaTiO 3 films. The F4C content of 2 wt% PVDF/PMMA-F4C-BaTiO 3 nanocomposite films showed the lowest dielectric loss of 0.055, which was 56.7% lower than the unmodified PVDF/PMMA-BaTiO 3 films. The breakdown strength of the PVDF/PMMA-F4C-BaTiO 3 nanocomposite films increased and then decreased with the increase of the F4C content, and the highest breakdown strength was 2800 kV/cm at 4 wt% F4C, which was 55.6% higher than the unmodified PVDF/PMMA-BaTiO 3 films. The charging density of the PVDF/PMMA-F4C-BaTiO 3 nanocomposite films reached a maximum value of 20.65 J/cm 3 at 4 wt% F4C content, which was 394% higher than the unmodified PVDF/PMMA-BaTiO 3 films. Highlights Modification of ceramic nanoparticles with carboxylic acid coupling agent. The dielectric properties of the modified nanocomposite film were significantly improved. Maximum polarization and charge/discharge density were greatly improved by coupling agent modification.
研究领域:
材料科学
·
高分子化学
·
电气工程
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LANGMUIR
·
2025
·
IF 3.9
Hailong Wang,Mengyao Wang,Jibo Tang,Yiman Zhang,Qingqian Wang,Yangming Hu,Wenjun Zhang,Xiaobo He,Hongxing Xu
Microwell plates absorb bioactive compounds and are commonly used for disease prediction, diagnosis, and monitoring. Chemical absorption is more effective than physical absorption for stabilizing these compounds. This study systematically investigates the fundamental mechanisms of air plasma-induced surface modifications in poly(methyl methacrylate) (PMMA), focusing on carboxyl group formation kinetics, morphological evolution, and optical property changes. Air plasma treatment enhances the hydrophilicity and surface roughness of the PMMA plates. Light transmission remains comparable to untreated plates for 10 min treatment durations. Treatment for 3 min significantly increases the large-molecular-weight carboxyl compounds, with minimal loss after wash buffer rinsing. Thus, a 3 min air plasma treatment optimally enhances PMMA microwell plates for effective bioactive compound absorption.
研究领域:
生物医学工程
·
材料科学
·
诊断学
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POLYMER TESTING
·
2021
·
IF 4.282
Yang Pan,Bin Yang,Ning Jia,Yangnan Yu,Xiang Xu,Yingying Wang,Bin Wu,Jiasheng Qian,Ru Xia,Chenjun Wang,Aiqing Sun,You Shi
In this work, multi-layer hot pressing (MLHP) method was used to prepare the graphene nanoplatelets (GNPs) filled polymethyl methacrylate (PMMA) composites. Effect of GNP content on the viscoelastic behavior and thermomechanical properties of composites was studied via rheometer, scanning electron microscope (SEM), infrared thermal imaging (ITI) and dynamic mechanical thermal analysis (DMTA), etc. According to dynamical rheological testing, thermorheological complexity was clearly displayed at elevated GNP content, based upon flow activation energy ( E a ) and time-temperature superposition (TTS) principle. The infrared thermal imaging (ITI) indicated that a filler conductive network was gradually formed with increasing filler content. The average heating rate of the samples increased from 0.74 to 0.92 °C/s. The Agari model was found to fairly interpret the variation of thermal conductivity as a function of GNP loading, which agreed well with SEM observation and indicative of the formation of a GNP network structure. Dynamic thermomechanical properties of the composites were heavily influenced by the temperature distributions within the samples. The addition of GNP increased the glass transition temperature of PMMA from 116.7 to 125.9 °C, which favored enhanced thermophysical properties of PMMA. The prepared composites in this work showed wonderful mechanical properties even at relatively high temperatures (e.g., having storage modulus of 1.3–1.9 GPa and yielding strength more than 58.0 MPa at 50 °C). The current work is practically significant for further expanding the application range of PMMA/GNP nanocomposites.
研究领域:
材料科学
·
复合材料
·
热力学
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Biosensors-Basel
·
2021
·Vol. 11
·期 5
·162
·
IF 5.519
Mathias Busek,Steffen Nøvik,Aleksandra Aizenshtadt,Mikel Amirola-Martinez,Thomas Combriat,Stefan Grünzner,Stefan Krauss
Polydimethylsiloxane (PDMS) has been used in microfluidic systems for years, as it can be easily structured and its flexibility makes it easy to integrate actuators including pneumatic pumps. In addition, the good optical properties of the material are well suited for analytical systems. In addition to its positive aspects, PDMS is well known to adsorb small molecules, which limits its usability when it comes to drug testing, e.g., in organ-on-a-chip (OoC) systems. Therefore, alternatives to PDMS are in high demand. In this study, we use thermoplastic elastomer (TPE) films thermally bonded to laser-cut poly(methyl methacrylate) (PMMA) sheets to build up multilayered microfluidic devices with integrated pneumatic micro-pumps. We present a low-cost manufacturing technology based on a conventional CO2laser cutter for structuring, a spin-coating process for TPE film fabrication, and a thermal bonding process using a pneumatic hot-press. UV treatment with an Excimer lamp prior to bonding drastically improves the bonding process. Optimized bonding parameters were characterized by measuring the burst load upon applying pressure and via profilometer-based measurement of channel deformation. Next, flow and long-term stability of the chip layout were measured using microparticle Image Velocimetry (uPIV). Finally, human endothelial cells were seeded in the microchannels to check biocompatibility and flow-directed cell alignment. The presented device is compatible with a real-time live-cell analysis system.Keywords:organ-on-a-chip;micro-pneumatics;PDMS-free;thermoplastic elastomers;layer-by-layer manufacturing
研究领域:
生物医学工程
·
细胞生物学
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高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 11
·789
·
IF 4.3
Shunqi Mei,Feng Luo,Yi Xie,Bin Xu,Quan Zheng
Addressing the issues of poor thermal resistance in conventional polyolefin separators and the low production efficiency of electrospinning, this study innovatively employed high-efficiency centrifugal spinning technology to fabricate a ternary blended modified fiber membrane composed of polyacrylonitrile (PAN), polystyrene (PS), and polymethyl methacrylate (PMMA). By precisely adjusting the polymer ratio (8:2:2) and fine-tuning the spinning process parameters, a separator with a three-dimensional network structure was successfully produced. The research results indicate that the separator exhibited excellent overall performance, with a porosity of 75.87%, an electrolyte absorption rate of up to 346%, and a thermal shrinkage of less than 3% after 1 h at 150 °C, along with a tensile strength reaching 23.48 MPa. A lithium-ion battery assembled with this separator delivered an initial discharge capacity of 159 mAh/g at a 0.2 C rate and maintained a capacity retention of 98.11% after 25 cycles. Moreover, under current rates of 0.5, 1.0, and 2.0 C, the battery assembled with the ASM-14 configuration achieved high discharge capacities of 148, 136, and 116 mAh/g, respectively. This study offers a novel design strategy for modifying multi-component polymer battery separators.
研究领域:
材料科学
·
能源工程
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