RSC Advances
·
2019
·Vol. 9
·期 39
·22289-22294
·
IF 3.049
Dapeng Gu,Longxiao Zhang,Suwen Chen,Kefeng Song,Deng Pan,Bingchao Yang,Shouyao Liu
Polytetrafluoroethylene/poly(methyl methacrylate) (PTFE/PMMA) composites were prepared by a self-curing method. The influence of heat treatment processes on the friction and wear behaviors of PTFE/PMMA composites against bearing steel balls were studied by a ball-on-disk tribometer. The thermal performance of PTFE/PMMA composites with heat treatment was analyzed by Thermogravimetric Analysis (TGA). The surface morphologies and element distribution of PTFE/PMMA composites in a PMMA matrix were detected by Field Emission Scanning Electron Microscopy (FE-SEM) and Energy Dispersive Spectroscopy (EDS). The results indicated that the wear rates of PTFE/PMMA composites with different heat treatments significantly declined compared with the unheated treatment composite. The wear rate of the PTFE/PMMA composite decreased firstly and then increased with molding temperature and time increasing, and reduced with the molding pressure increasing. The main wear mechanisms of PTFE/PMMA composites with different heat treatments were fatigue wear and abrasive wear.
研究领域:
材料科学
·
机械工程
·
表面工程
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 11
·1484
·
IF 4.7
Junhui Wu,Junchao Jin,Po Hu,Jinhong Li,Zeyi Zeng,Qingdong Li,Jie Liu,Mingyong Chen,Zuoyu Zhang,Li Wang,Xiao Lin,Xiaodi Tan
Phenanthrenequinone-doped poly(methyl methacrylate) (PQ/PMMA) photopolymers are potential holographic storage media owing to their high-density storage capacities, low costs, high stability, and negligible shrinkage in volume holographic permanent memory. However, because of the limitations of the substrate, conventional Plexiglas materials do not exhibit a good performance in terms of photosensitivity and molding. In this study, the crosslinked structure of PMMA was modified by introducing a dendrimer monomer, pentaerythritol tetraacrylate (PETA), which increases the photosensitivity of the material 2 times (from ~0.58 cm/J to ~1.18 cm/J), and the diffraction efficiency is increased 1.6 times (from ~50% to ~80%). In addition, the modified material has a superior ability to mold compared to conventional materials. Moreover, the holographic performance enhancement was evaluated in conjunction with a quantum chemical analysis. The doping of PETA resulted in an overall decrease in the energy required for the reaction system of the material, and the activation energy decreased by ~0.5 KJ/mol in the photoreaction stage.
研究领域:
材料科学
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光学
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全息技术
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DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Wanlei Geng,Yinfeng Liu,Debin Wang,Mengyu Lin,Xue Yang,Limei Zhong,Runxiong Lin,Li Ding,Lianying Wu,Dianquan Dong
Radioactive Cs + is one of the most dangerous environmental pollutants . It is necessary for radioactive Cs + management and removal. Titanium-type cesium ion sieve with a strong Ti–O bond has the advantages of structural stability, radiation resistance and no secondary contamination, which is a promising adsorbent material. In this paper, The CTO (Cs 2 Ti 6 O 13 ) is prepared for the first time by sol-gel and de-templating methods, and cesium ion sieves (HTO/PMMA) are further obtained with diluted HCl elution. Compared with the ionic sieves (HTO) prepared by direct sol-gel method, the adsorption capacity is improved from 224.32 mg/g to 299.15 mg/g. The prepared HTO/PMMA has a larger specific surface area (67.282 m 2 /g). More exchange sites are provided for the adsorption of Cs ions. Moreover, Adsorption involves the cleavage of O–H bonds and the formation of O–Cs bonds, which is a typical ion exchange reaction . A series of batch experiments are carried out. The results showed that the equilibrium adsorption capacity of HTO/PMMA is 307.69 mg/g and remained high in the interfering ion solution as well (280.38 mg/g). The pseudo second order model and Freundlich model can well describe the ion exchange process. Thermodynamic study shows that adsorption is spontaneous and exothermic, and low temperature is conducive to adsorption in H + - Cs + exchange system. Finally, the reusability of HTO/PMMA is evaluated. The adsorption capacity did not decrease significantly after 5 cycles of use. Therefore, HTO/PMMA is expected to be an excellent material for recovering radioactive Cs + .
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 63
·58733-58739
·
IF 3.289
Xuguang Zhang,Jianping Xu,Shaobo Shi,Xueliang Wang,Xiangguo Zhao,Ping Zhou,Zeming Liu,Chang Wang,Lan Li
The ferroelectric-like hysteretic I–V effect was observed in the multilayer film of PMMA/carbon quantum dot (CD)/PEDOT:PSS using ITO and Al metal as the electrodes. The multilayer film exhibited two different resistance states and larger hysteresis window under the electric field compared to the film without CD addition. The influence of additional CD layers on the short circuit current (Isc) and open circuit voltage (Voc) values is related to the interfacial polarization between PMMA and PEDOT:PSS layers. The introduction of a CD layer intensifies interfacial polarization for two dielectric layers, resulting in the larger hysteresis window. An interfacial polarization field E′ increases with the external electric field increasing and reaches a maximum value at the threshold voltage Voc of ±15 V. The switch reliability of the device is operated over 5 × 103 times in a succession of periodic pulses without any performance degradation.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
XiaoYa Hao,Qiong Fu,YaFei Hou,YuanJie Yan,TingYu Fu,Jing Cuan,Peng Du,LaiHui Luo,WeiPing Li
Both high discharge energy density (Ud) and charge–discharge efficiency (η) for nanocomposites are crucial to the development and application of modern electronic devices. However, the large dielectric contrast and ferroelectric phase greatly limit the improvement of Ud and η of poly(vinylidene fluoride) (PVDF)-based nanocomposites. Herein, Bi2O2CO3 (simplified as BOC) nanosheets with low dielectric constant and wide bandgaps and linear poly(methyl methacrylate) (PMMA) were filled into PVDF by solution casting to fabricate x vol % BOC/PAPF (PAPF is short for PMMA/PVDF) nanocomposites. The contributions of BOC nanosheets and linear PMMA, especially for the BOC nanosheet, have been systematically studied. Both experimental and simulation results show that BOC nanosheet and PMMA could improve the breakdown strength and reduce the dielectric loss and leakage current of nanocomposites simultaneously, realizing Ud and η improvement at the same time. As a result, the 1.0 vol % BOC/PAPF nanocomposite shows the highest energy storage performance with Ud = 13.68 J/cm3 and η = 85.72%, which is much superior to PVDF. Therefore, this study might provide a proof-of-concept for constructing nanocomposites with excellent Ud and η concurrently.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Bo Liang,Siqi Tang,Qingbai Jiang,Chuangsheng Chen,Xu Chen,Shengliang Li,Xuehui Yan
This paper presents the preparation and characterization of a series of PEO-PMMA composites containing different lithium salts (LiClO 4 or LiTFSI) with or without nano-Al 2 O 3 . Nano-Al 2 O 3 is added to the polymer electrolytes to alter the morphology, ionic conductivity , interfacial and thermal shrinkage properties. Nano-Al 2 O 3 can effectively improve the stability of the polymer electrolyte membrane interface. The tensile strength of the PEO-PMMA-LiTFSI-Al 2 O 3 electrolyte membrane is 3.24 MPa at room temperature . The study shows that the ion conductivities at room temperature for PEO-PMMA-LiTFSI (EO/Li + = 10) and PEO-PMMA-LiTFSI-Al 2 O 3 (EO/Li + = 10) are 6.71 × 10 −7 S/cm and 9.39 × 10 −7 S/cm, respectively. A good dimensional stability was observed for PEO-PMMA-LiTFSI with a thermal shrinkage of 8.7%. The electrochemical windows of PEO-PMMA-LiTFSI and PEO-PMMA-LiTFSI-Al 2 O 3 are all stable up to 4.6 V versus Li + /Li, which makes them good electrolyte candidates of lithium ion batteries with high-potential cathodes.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 9
·1107
·
IF 2.881
Xiaoming Feng,Guizhong Tian,Shichao Niu,Honggen Zhou
Transparent substrates with antifogging and antireflection ability are of extreme significance for optical devices, because they alleviate performance loss and maintenance costs. Here, we reported that a multifunctional film, with excellent mechanical properties, can be fabricated on the PMMA surface via the micro-transfer printing method. In particular, the synergistic effect of the inverted pyramid microstructure and SiO2nanoparticles gives the film excellent antireflective, superhydrophilic and antifogging properties, and the silica sol firmly adheres to the PMMA substrate via the silane coupling agent, which exhibits an encouraging prospect of practical applications from lenses for personal and sports eyewear to transparent displays and sensors, etc.Keywords:coupled PMMA film;inverted pyramid microstructures;superhydrophilicity;antifogging;antireflection
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
JOURNAL OF ELECTRONIC MATERIALS
·
2025
·
IF 2.5
Zhang Yue,Zhu Bixuan,He Yu,Guo Jiacheng,He Ruiqi,Cai Chuanyezi,Ye Lu,Li Hongwei,Zhang Jianjun,Ma Sude
Polyvinylidene fluoride (PVDF) is one of the most widely studied polymers for the development of film capacitors with high energy density. However, it is still challenging to modulate the polarization hysteresis phenomenon of PVDF in a simple and effective way to achieve a significant increase in energy density. In this work, a low-loss amorphous polymer poly(methyl methacrylate) (PMMA) was introduced as a reinforcing phase to be blended with PVDF to form a matrix. The dielectric and energy storage performance of PVDF is improved by integrating the high dielectric property of barium titanate (BaTiO 3 ) with the low hysteresis property of PMMA. PMMA/PVDF-BaTiO 3 nanocomposites were prepared by spin-coating process. It was shown that the PMMA/PVDF-BaTiO 3 nanocomposites had a thin and flat macroscopic structure and a uniform and dense microstructure. The optimum dielectric constant of the nanocomposites was 12.9 at 100 Hz, and the optimum energy density was maximized to 6.5 J/cm 3 . Compared with the PVDF/PMMA composites, the dielectric and energy storage performance were significantly improved under the same conditions. This work provides a simple and effective strategy for obtaining polymer nanocomposites with high energy density and with potential as flexible dielectric substrates for film capacitors.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Shuang Guo,Shuxue Zhou,Huijing Li,Bo You
This paper presents a facile method to fabricate volumetric light diffusing films with high transmittance and haze simultaneously by mimicking the micro- and nanostructure of compound eyes. Strawberry-like polymethyl methacrylate/SiO 2 composite microspheres were first prepared via the electrostatic attraction between positively charged PMMA spheres and negatively charged SiO 2 nanoparticles , and further blended with polyacrylate latex to produce light diffusing coatings. A novel light diffusing film with hemispherical surface was built by casting the light diffusing coatings on optical-grade PET film. Effects of the sizes of PMMA spheres and SiO 2 nanoparticles on the optical properties of light diffusing film were investigated by a haze meter and application on a LED lamp. The best result (transmittance 94.6% and haze 84.2%) was achieved for the strawberry-like composite microspheres based on 1 μm PMMA spheres and 50 nm SiO 2 nanoparticles. The light-diffusing mechanism of the strawberry-like microspheres in the film was discussed.
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
SOLAR ENERGY
·
2015
·
IF 3.469
Wei Zhou,Moo-Chin Wang,Xiujian Zhao
The PMMA/DCJTB thin-film luminescent solar concentrators (LCSs) with various thicknesses have been successfully prepared with the spin coating process. The properties of PMMA/DCJTB thin-film LSCs with various thicknesses have been studied. The cross-sectional field-emission scanning electron microscopy (FESEM) micrographs show that the thin-films on the glass substrate are very smooth. The thicknesses are 1.36 ± 0.03, 1.93 ± 0.07, 2.80 ± 0.05 and 4.00 ± 0.06 μm. The value of the absolute fluorescence quantum yield ( Φ f ) of the as-prepared LSCs decreases from 59.09% to 51.91% when the PMMA/DCJTB thin-film thickness increases from 1.36 to 4.00 μm. The values of open-circuit voltage ( V oc ), short-circuit current density ( J sc ), fill factor ( FF ), and overall power conversion efficiency ( η ) are 0.51 V, 29.47 mA/cm 2 , 65.54%, and 9.85%, respectively, for the PMMA/DCJTB thin-film LSCs with a thickness of 4.00 μm.
研究领域:
材料科学
·
光学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2022
·
IF 7.685
Zhen Wang,Wenqing Xue,Yongzhi Yang,Yuchao Li,Shuangshuang Wang,Yanhu Zhan,Wei Li,Jigong Hao,Jun-Wei Zha,Chen Liu,Yulin Cao,Zhouguang Lu
Flexible dielectric materials are highly desirable in many electric/electronic devices for energy harvesting applications, but they usually suffer from the paradox of high dielectric constant and large breakdown strength , thereby reducing the overall energy storage capacity and mechanical strength with large filler loadings. In this work, poly(methyl methacrylate) (PMMA) brush-modified graphene (rGO-g-PMMA) was successfully introduced into poly(vinylidene fluoride) (PVDF) matrix via solution casting method. The PMMA brush-modified graphene for one thing promoted graphene distribution in the PVDF matrix, for another, it effectively limited carrier leakage of conductive graphene by forming a thin insulating PMMA layer. Therefore, the dielectric constant of rGO-g-PMMA/PVDF films was obviously increased, while the dielectric loss was distinctly suppressed with a small addition of the “core-shell” like rGO-g-PMMA. What's more, the breakdown strength of composites increased with rGO-g-PMMA loadings up to 0.2 wt%, accompanied by a 157% increase in energy density of FGM-0.2 composite to that of neat PVDF. In addition, the obtained rGO-g-PMMA/PVDF dielectric films possessed improved thermal stability and mechanical strength due to the homogeneous dispersion and good interfacial adhesion of rGO-g-PMMA within PVDF matrix. Such study provided a new strategy in obtaining flexible, high strength and large energy storage dielectric films.
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 the Australian Ceramic Society
·
2020
·Vol. 57
·期 1
·81-90
·
IF 1.307
Zhao Yu,Zhou Jun,Shu Zhu,Wang Yanxin,Yakubu Yahaya,Zhang Yi,Li Xiaoqian
Previously, a way to process phosphogypsum (PG) into non-fired ceramic tile by an intermittent loading hydration process was proposed; however, its mechanical strength and especially waterproof property are unsatisfactory. Herein, PG non-fired ceramic with a porosity reduced was prepared and used as a matrix, which was then impregnated with MMA together with azobisisobutyronitrile (AIBN) and benzoyl peroxide (BPO) as initiators. After polymerization, a novel 3-3 type PMMA/PG non-fired ceramic composite with highly improved mechanical and waterproof properties was obtained. The bending strength, softening coefficient, and contact angle of the PMMA/PG composite are 21.5 MPa, 0.78, and 75.1°, which are 1.43, 1.77, and 1.68 times those of the matrix, respectively. It is found that PMMA completely covers the matrix surface and well fills the interparticle pores of dihydrate gypsum crystals inside the matrix, forming an interpenetrating and dense composite structure. This work can guide not only the utilization of waste PG but also the development of polymer/gypsum composite product. Graphical abstract We designed a facile process to prepare a novel 3-3 type PMMA/PG non-fired ceramic composite with highly improved mechanical and waterproof properties. The bending strength, softening coefficient, and contact angle of the final PMMA/PG composite are 21.5 MPa, 0.78, and 75.1°, which are 1.43, 1.77, and 1.68 times those of the matrix, respectively. The improvements originate from the delicate structure that PMMA completely covers the outside surface of the PG matrix and well fills the pores inside the PG matrix. PMMA tightly combines with dihydrate gypsum crystals and forms a relatively dense 3-3 type three-dimensional composite.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）