scholarly journals Microscopic Kinetics in Poly(Methyl Methacrylate) Exposed to a Single Ultra-Short XUV/X-ray Laser Pulse

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6701
Author(s):  
Nikita Medvedev ◽  
Jaromír Chalupský ◽  
Libor Juha
Keyword(s):  
Methyl Methacrylate ◽  
Interatomic Potential ◽  
Extreme Ultraviolet ◽  
Complete Separation ◽  
Single Shot ◽  
Microscopic Simulation ◽  
Hydrogen Atoms ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
Higher Doses

We study the behavior of poly(methyl methacrylate) (PMMA) exposed to femtosecond pulses of extreme ultraviolet and X-ray laser radiation in the single-shot damage regime. The employed microscopic simulation traces induced electron cascades, the thermal energy exchange of electrons with atoms, nonthermal modification of the interatomic potential, and a triggered atomic response. We identify that the nonthermal hydrogen decoupling triggers ultrafast fragmentation of PMMA strains at the absorbed threshold dose of ~0.07 eV/atom. At higher doses, more hydrogen atoms detach from their parental molecules, which, at the dose of ~0.5 eV/atom, leads to a complete separation of hydrogens from carbon and oxygen atoms and fragmentation of MMA molecules. At the dose of ~0.7 eV/atom, the band gap completely collapses indicating that a metallic liquid is formed with complete atomic disorder. An estimated single-shot ablation threshold and a crater depth as functions of fluence agree well with the experimental data collected.

Properties of Carbon Nanofibers Prepared from Polyacrylonitrile/Poly(methyl Methacrylate) Blend

2009 ◽  
Vol 79-82 ◽  
pp. 353-356
Author(s):  
Wei Pan ◽  
Yan Chen ◽  
Xiao Wei He
Keyword(s):  
Methyl Methacrylate ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Nitrogen Atmosphere ◽  
Wet Spinning ◽  
X Ray Diffraction ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
Graphite Crystallite ◽  
Raman Microspectrometry

The polyacrylonitrile(PAN)/poly (methyl methacrylate)(PMMA) blend fibers were prepared by wet-spinning technique and carbonized over the temperature range of 400-1000°C in nitrogen atmosphere. After carbonization of the blend fibers, the PMMA component removed and the PAN component left in the form of carbon nanofibers. Morphology of the carbon nanofibers were investigated via scanning electron microscopy (SEM), and the carbonization behavior of the fibers were examined via x-ray diffraction (XRD), Raman microspectrometry. The optimal condition made carbon fibers with great L/D ratio and diameter less than 200 nm. XRD and Raman spectra shows that the PAN/PMMA blend fibers treated at 600°C produced some graphite crystallite.

Small-angle x-ray scattering investigation of poly(methyl methacrylate)-alumina nanocomposite

2019 ◽  
Author(s):  
Jitendra Bahadur ◽  
S. K. Sharma ◽  
Avik Das ◽  
Debasis Sen ◽  
P. K. Pujari
Keyword(s):  
Methyl Methacrylate ◽  
Small Angle ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals X-ray-Induced Production of Gold Nanoparticles on a SiO2/Si System and in a Poly(methyl methacrylate) Matrix

Langmuir ◽  
2005 ◽  
Vol 21 (1) ◽  
pp. 437-442 ◽  
Author(s):  
Ferdi Karadas ◽  
Gulay Ertas ◽  
Eda Ozkaraoglu ◽  
Sefik Suzer
Keyword(s):  
Gold Nanoparticles ◽  
Methyl Methacrylate ◽  
X Ray ◽  
Poly Methyl Methacrylate

Crystallite modulus of double-stranded helices of isotactic poly(methyl methacrylate): the X-ray measurement and the theoretical calculation

Polymer ◽  
1999 ◽  
Vol 40 (12) ◽  
pp. 3345-3351 ◽  
Author(s):  
Sebastien Urbanek ◽  
Kohji Tashiro ◽  
Tatsuki Kitayama ◽  
Koichi Hatada
Keyword(s):  
Methyl Methacrylate ◽  
Theoretical Calculation ◽  
X Ray ◽  
Poly Methyl Methacrylate

scholarly journals X-ray powder diffraction quantitative analysis of an amorphous SiO2–poly(methyl methacrylate) nanocomposite

2008 ◽  
Vol 41 (6) ◽  
pp. 985-990 ◽  
Author(s):  
P. Riello ◽  
M. Munarin ◽  
S. Silvestrini ◽  
E. Moretti ◽  
L. Storaro
Keyword(s):  
Quantitative Analysis ◽  
Methyl Methacrylate ◽  
Powder Diffraction ◽  
Amorphous Material ◽  
Hybrid Nanocomposite ◽  
Amorphous Sio2 ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
Quantification Method ◽  
The Individual

Quantification of individual phases within a multiphase amorphous material has been achieved using a newly developed technique based on X-ray powder diffraction. The quantification method was developed during a study of an amorphous silica–poly(methyl methacrylate) (SiO2–PMMA) hybrid nanocomposite. The efficiency of the method as a quantifying tool for individual phases was demonstrated for samples of SiO2–PMMA prepared either by polymerization of methyl methacrylate in the presence of amorphous SiO2or by mechanically mixing known quantities of the individual and pre-prepared SiO2and PMMA materials. The weight percentages of amorphous SiO2in the nanocomposites as determined by application of the new technique were analogously found to be 29%, a result that was supported by thermogravimetric analysis and helium picnometry measurements.

The absorption coefficient spectrum of poly(methyl methacrylate) in the soft X-ray region

1992 ◽  
Vol 30 (2) ◽  
pp. 185-195 ◽  
Author(s):  
B. W. Yates ◽  
D. M. Shinozaki ◽  
Ashok Kumar ◽  
William J. Meath
Keyword(s):  
Absorption Coefficient ◽  
Methyl Methacrylate ◽  
X Ray ◽  
Poly Methyl Methacrylate

scholarly journals Flexural strength and modulus of autopolimerized poly (methyl methacrylate) with nanosilica

2018 ◽  
Vol 75 (6) ◽  
pp. 564-569 ◽  
Author(s):  
Sebastian Balos ◽  
Branka Pilic ◽  
Djordje Petrovic ◽  
Branislava Petronijevic ◽  
Ivan Sarcev
Keyword(s):  
Mechanical Properties ◽  
Zeta Potential ◽  
Methyl Methacrylate ◽  
Flexural Modulus ◽  
Energy Dispersive ◽  
Polymerization Process ◽  
Liquid Component ◽  
Potential Measurement ◽  
X Ray ◽  
Poly Methyl Methacrylate

Background/Aim. Autopolymerized, or cold polymerized poly(methyl methacrylate) class of materials have a lower mechanical properties compared to hot polymerized poly(methyl methacrylate), due to a limited time of mixing before the polymerization process begins. The aim of this study was to test the effect of different relatively low nanosilica contents, in improving mechanical properties of the cold polymerized poly(methyl methacrylate). Methods. A commercially available autopolymerized poly(methyl methacrylate) denture reline resin methyl methacrylate liquid component was mixed with 7 nm after treated hydrophobic fumed silica and subsequently mixed with poly(methyl methacrylate) powder. Three nanosilica loadings were used: 0.05%, 0.2% and 1.5%. Flexural modulus and strength were tested, with one way ANOVA followed by Tukey?s test. Furthermore, zeta potential, differential scanning calorimetry, scaning electrone microscopy and energy dispersive X-ray analyses were performed. Results. Flexural modulus and strength of poly(methyl methacrylate) based nanocomposites were statistically significantly increased by the addition of 0.05% nano-SiO2. The increase in nanosilica content up to 1.5% does not contribute to mechanical properties tested, but quite contrary. The main reason was agglomeration, that occurred before mixing of the liquid and powder component and was proved by zeta potential measurement, and after mixing, proved by scanning electrone microscopy and energy dispersive x-ray analyses. Conclusions. Addition of 7 nm 0.05% SiO2 is the most effective in increasing flexural modulus and strength of autopolimerized poly(methyl methacrylate).

scholarly journals Preparation and Characterization of Zinc Oxide (Zno)/Polymethyl Methacrylate (PMMA) Nanocomposites

2021 ◽  
Vol 04 (04) ◽  
Author(s):  
Jayashree Bagawade ◽  
Keyword(s):  
Zinc Oxide ◽  
Methyl Methacrylate ◽  
Zinc Oxide Nanoparticles ◽  
Nanocomposite Films ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
Absorption Measurements

A series of novel zinc oxide / Poly (methyl methacrylate) nanocomposite films with different ZnO contents were prepared through inclusion of pre-synthesized zinc oxide nanoparticles. The physical composition and morphology of the as-prepared nanocomposites were studied by XRD and TEM. The TEM analyses revealed that the zinc oxide nanoparticles have a particle size of ~3–5 nm. X-ray diffraction proved the presence of the amorphous PMMA in the nanocomposites. The intermolecular interactions within the polymer nanocomposites were explored by FTIR and XRD. FTIR spectra confirmed the dispersion of the zinc oxide nanoparticles in the Poly (methyl methacrylate) i.e. PMMA matrices. The UV-Vis absorption measurements of the ZnO/PMMA nanocomposites proved their potential optical properties.

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