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Chi C, Lin J, Lu X, Zheng Y, Luo Y, Chen Q. Anisotropic nucleation and compatibilization of SiO2@PS Janus particles on expandable polystyrene. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Sadovnichii DN, Milekhin YM, Sheremet’ev KY, Kazakov ED, Markov MB, Savenkov EB. Phase Transformations and Formation of Nanofibers under the Action of a Nanosecond Relativistic Electron Beam on Syntactic Foams with a Polymeric Siloxane Binder. RUSS J APPL CHEM+ 2022. [DOI: 10.1134/s1070427222010128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Diamond and methane formation from the chemical decomposition of polyethylene at high pressures and temperatures. Sci Rep 2022; 12:631. [PMID: 35022446 PMCID: PMC8755720 DOI: 10.1038/s41598-021-04206-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Accepted: 12/07/2021] [Indexed: 11/08/2022] Open
Abstract
Polyethylene (C2H4)n was compressed to pressures between 10 and 30 GPa in a diamond anvil cell (DAC) and laser heated above 2500 K for approximately one second. This resulted in the chemical decomposition of the polymer into carbon and hydrocarbon reaction products. After quenching to ambient temperature, the decomposition products were measured in the DAC at pressures ranging from ambient to 29 GPa using a combination of x-ray diffraction (XRD) and small angle x-ray scattering (SAXS). XRD identified cubic diamond and methane as the predominant product species with their pressure-volume relationships exhibiting strong correlations to the diamond and methane equations of state. Length scales associated with the diamond products, obtained from SAXS measurements, indicate the formation of nanodiamonds with a radius of gyration between 12 and 35 nm consistent with 32-90 nm diameter spherical particles. These results are in good agreement with the predicted product composition under thermodynamic and chemical equilibrium.
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Sadovnichii DN, Milekhin YM, Kalinin YG, Kazakov ED, Sheremet’ev KY, Markov MB, Pertsev NV, Krutikov DI. Specific Features of the Action of a Nanosecond Relativistic Electron Beam on a Syntactic Foam with the Butadiene–Acrylonitrile Rubber Base. RUSS J APPL CHEM+ 2021. [DOI: 10.1134/s1070427221080152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
We present a mathematical model for the propagation of the shock waves that occur during planetary collisions. Such collisions are thought to occur during the formation of terrestrial planets, and they have the potential to erode the planet’s atmosphere. We show that, under certain assumptions, this evolution of the shock wave can be determined using the methodologies of Type II self similar solutions. In such solutions, the evolution of the shock wave is determined by boundary conditions at the shock front and a singular point in the shocked region. We show how the evolution can be determined for different equations of state, allowing these results to be readily used to calculate the atmospheric mass loss from planetary cores made of different materials. We demonstrate that, as a planetary shock converges to the self similar solution, it loses information about the collision that created it, including the impact angle for oblique collisions.
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Antunes M, Velasco JI. Polymeric Foams. Polymers (Basel) 2019; 11:polym11071179. [PMID: 31336996 PMCID: PMC6680933 DOI: 10.3390/polym11071179] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 07/11/2019] [Indexed: 11/16/2022] Open
Abstract
Advances in nanotechnology have boosted the development of more efficient materials, with emerging sectors (electronics, energy, aerospace, among others) demanding novel materials to fulfill the complex technical requirements of their products [...].
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Affiliation(s)
- Marcelo Antunes
- Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat Politècnica de Catalunya (UPC·Barcelona Tech), C/Colom 11, E-08222 Terrassa, Barcelona, Spain
| | - José Ignacio Velasco
- Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat Politècnica de Catalunya (UPC·Barcelona Tech), C/Colom 11, E-08222 Terrassa, Barcelona, Spain.
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Zhu Y, Luo G, Zhang R, Liu Q, Sun Y, Zhang J, Shen Q, Zhang L. Investigation of the Constitutive Model of W/PMMA Composite Microcellular Foams. Polymers (Basel) 2019; 11:polym11071136. [PMID: 31277266 PMCID: PMC6680754 DOI: 10.3390/polym11071136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 06/25/2019] [Accepted: 06/26/2019] [Indexed: 11/20/2022] Open
Abstract
Investigating the constitutive relationship of a material can provide better understanding of the mechanical properties of a material and has an irreplaceable effect on optimizing the performance of a material. This paper investigated a constitutive model for tungsten/polymethyl-methacrylate (W/PMMA) composite microcellular foams prepared by using melt mixing and supercritical carbon dioxide foaming. The stress-strain relationships of these foams with different W contents were measured under static compression. The elastic modulus and compressive strength values of the foams were remarkably greater than those of the pure PMMA foams: at a W content of 20 wt %, these values were increased by 269.1% and 123.9%, respectively. Based on the Maxwell constitutive model, the relevant coefficients were fitted according to the experimental data of different relative densities and W contents in quasi-static compression. According to the numerical relationships between the relevant coefficients and the relative densities and W contents, the quasi-static mechanical constitutive model of W/PMMA composite microcellular foams with W contents of 0~60 wt % and relative densities of 0.15~0.55 were predicted. This study provided basic data for the optimal design of the W/PMMA composite microcellular foams and proposed a method for investigating the mechanical properties of composite microcellular foam materials.
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Affiliation(s)
- Yuxuan Zhu
- State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China
| | - Guoqiang Luo
- State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China
| | - Ruizhi Zhang
- State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China
| | - Qiwen Liu
- Hubei Key Lab of Theory and Application of Advanced Materials Mechanics, Department of Mechanics and Engineering Structure, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China.
| | - Yi Sun
- State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China
| | - Jian Zhang
- State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China
| | - Qiang Shen
- State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China.
| | - Lianmeng Zhang
- State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China
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