scholarly journals Hybrid composites with low reflection of IR radiation

2020 ◽  
Vol 21 (4) ◽  
pp. 764-770
Author(s):  
О.І. Aksimentyeva ◽  
I.B. Chepikov ◽  
R.V. Filipsonov ◽  
S.Z. Malynych ◽  
R.V. Gamernyk ◽  
...  
Keyword(s):  
Hybrid Composites ◽  
Protective Coatings ◽  
Composite Films ◽  
Microwave Range ◽  
Ir Radiation ◽  
Epoxy Composition ◽  
Inorganic Composites ◽  
Toluene Sulfonic Acid ◽  
High Microhardness ◽  
Polymer Shells

The conditions of formation and properties of hybrid organic-inorganic composites based on epoxy polymer matrix and a mixture of magnetic and polymeric fillers are studied. Based on the study of physicochemical properties of fillers and composites, it was found that the introduction of a dispersion of magnetite modified with polymer shells and polyaniline doped with toluene sulfonic acid in the thermosetting epoxy composition in the amount of 2-6 wt.% provides the ability of composites to significant absorption and low reflection of IR and microwave range. It was found that the optimal content of the composition corresponds to the best mechanical properties of the obtained coatings, in particular, high microhardness. This makes it possible to use the proposed composition to obtain on its basis composite films and coatings for anti-radar purposes, which reduce the intensity of microwave radiation acting on the object and at the same time act as protective coatings on the surface of metals.

scholarly journals Layer-by-Layer Deposition of Copper and Phosphorus Compounds to Develop Flame-Retardant Polyamide 6/Montmorillonite Hybrid Composites

2020 ◽  
Vol 10 (14) ◽  
pp. 5007 ◽  
Author(s):  
Tomasz M. Majka ◽  
Monika Witek ◽  
Paulina Radzik ◽  
Karolina Komisarz ◽  
Agnieszka Mitoraj ◽  
...  
Keyword(s):  
Hybrid Composites ◽  
Protective Coatings ◽  
Synergistic Effects ◽  
Polyamide 6 ◽  
Hybrid Nanocomposites ◽  
Phosphorus Compounds ◽  
Double Layers ◽  
Layer By Layer ◽  
Maximum Point ◽  
Layer Deposition

Nowadays, increasing attention is devoted to the search for polymeric composite materials that are characterized by reduced flammability. In this work, the layer-by-layer (LbL) technique was applied to form multilayered protective coatings for polyamide 6/montmorillonite (PA6/MMT) hybrid nanocomposites. This time, the double layers LbL deposition was used in order to improve the thermal properties or flammability of PA6 materials. Our goal was to check how five, 10, and 15 triple-layer deposition onto the surface of PA6 and PA6/MMT composites influenced these relevant properties. For this reason, disodium H-phosphonate, sodium montmorillonite, and iodo-bis(triphenylphosphino)copper were used for polyelectrolyte solution preparation. It was found that the LbL method could be successfully used to improve the flammability characteristics of polyamide 6-based composites. Nevertheless, the deposition of the copper complex should be combined with other flame retardants—preferentially containing phosphorus—which enable synergistic effects to occur. Moreover, microscopic observations confirmed that the surfaces on which the formation of interwoven fibrous crystal structures was observed had a tendency to protect the entire material against the destructive effects of heat, contributing, among other things, to reduce the maximum point of heat release rate (PHRR).

Modification and Study of Polymer Films Using High Energy Ion Beams

1983 ◽  
Vol 25 ◽  
Author(s):  
T. Venkatesan
Keyword(s):  
Polymer Films ◽  
Ion Beam ◽  
Composite Films ◽  
High Energy ◽  
Carbon Films ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Inorganic Composites ◽  
Yield Information ◽  
High Energy Ions

ABSTRACTRecent results on the effects of high energy ion beam irradiation in polymer films are reviewed in this paper. High energy ions (>10 keV/amu) deposit a large amount of energy (∼several cV/atom) in ionizing the electrons of the target atoms. This results in significant destruction of bonds in the films as a result of which polymers undergo rapid dissociation. Using a quadrupole mass spectrometer the study of transient emission of molecular species produced by an ion pulse has been shown to yield information about the diffusion and reaction kinetics of various molecules in the polymer. The fact that polymers undergo dissociation and those atoms which form volatile species are selectively depleted from the film could be utilized in producing useful inorganic composites by ion bombardment of polymers. For example, hard SiC composite films have been produced by ion beam irradiation of organo-silicon polymers. Eventually, polymer dissociation leads to a predominately carbon containing film which exhibits interesting electronic transport properties. Experiments on ion irradiated, pure carbon films indicate that a metallic form of carbon is produced from the polymer films at high irradiation doses.

scholarly journals Development of technology for producing biodegradable hybrid composites based on polyethylene, starch, and monoglycerides

2021 ◽  
Vol 15 (6) ◽  
pp. 44-55
Author(s):  
I. Yu. Vasilyev ◽  
V. V. Ananyev ◽  
V. V. Kolpakova ◽  
A. S. Sardzhveladze
Keyword(s):  
Tensile Strength ◽  
Mechanical Performance ◽  
Hybrid Composites ◽  
Composite Films ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Elongation At Break ◽  
Biodegradable Composite ◽  
Develop Technology ◽  
Distilled Monoglycerides

Objectives. This work aimed to develop technology to produce biodegradable hybrid composite (BHC) films based on low-density polyethylene (LDPE) 115030-070 and thermoplastic starches (TPS) of various origins (corn, pea, and rice), with distilled monoglycerides as the plasticizer. The properties of the produced BHC films were studied and the optimal native starch : glycerol : monoglycerides ratio is proposed.Methods. TPS and BHC films based on this material were produced from different types of native starches in laboratory extruders (Brabender and MashPlast, Russia), and the extruded melts were subjected to ultrasonic vibrations. The structure and appearance of the BHC films were studied using scanning electron microscopy and rheology. Their biodegradability was assessed by immersing them in biocompost for three months. To evaluate the mechanical performance of the BHC films produced with and without ultrasound, the changes in tensile stress and elongation at break were determined during the biodegradation process.Results. The BHC films had a homogeneous structure, except small agglomerates (non-melted starch grains), which did not reduce their quality. The films with monoglycerides had high tensile strength, which was comparable with low-density polyethylene. After removing samples of the BHC films from the biocompost, their tensile strength decreased by 20%, which shows their biodegradability.Conclusions. The produced biodegradable composite films and the technology used to produce them will be applicable for the packaging industry to reduce environmental impact.

scholarly journals Characterization of Nanosilica/Low-Density Polyethylene Nanocomposite Materials

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Malek Alghdeir ◽  
Khaled Mayya ◽  
Mohamed Dib
Keyword(s):  
Composite Films ◽  
Far Infrared ◽  
Tensile Tests ◽  
Optical Measurements ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Melt Mixing ◽  
Ir Radiation ◽  
Ldpe Composites ◽  
Nanosilica Particles

Six ratios of nanosilica particles were employed to fabricate low-density polyethylene (LDPE) composites using melt mixing and hot molding methods. Several composite films with different ratios (0.5, 1, 2.5, 5, 7.5, and 10 wt%) of SiO2 were prepared. The obtained composite films were identified and characterized by Fourier-transform infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy (UV-VIS). At a specific mixing ratio, far infrared radiation transmittance was prohibited while the ultraviolet-visible transmittance is allowed; this will be explained in detail. Optical measurements show that the composite films prevent the transmission of IR radiation near 9 μm and allow UV-VIS transmission during sun-shining time. The mechanical behaviour of a nanosilica-reinforced LDPE composite was studied using tensile tests. The addition of 1 wt% nanosilica has successfully enhanced the mechanical properties of the LDPE material.

scholarly journals Fabrication of PEDOT: PSS-PVP Nanofiber-Embedded Sb2Te3 Thermoelectric Films by Multi-Step Coating and Their Improved Thermoelectric Properties

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2835
Author(s):  
Sang-il Kim ◽  
Kang Yeol Lee ◽  
Jae-Hong Lim
Keyword(s):  
Thermoelectric Properties ◽  
Power Factor ◽  
Photoelectron Spectroscopy ◽  
Hybrid Composites ◽  
Composite Films ◽  
X Ray Diffraction ◽  
Thermoelectric Efficiency ◽  
X Ray ◽  
Seebeck Coefficients ◽  
Electrical Conductivities

Antimony telluride thin films display intrinsic thermoelectric properties at room temperature, although their Seebeck coefficients and electrical conductivities may be unsatisfactory. To address these issues, we designed composite films containing upper and lower Sb2Te3 layers encasing conductive poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS)- polyvinylpyrrolidone(PVP) nanowires. Thermoelectric Sb2Te3/PEDOT:PSS-PVP/Sb2Te3(ED) (STPPST) hybrid composite films were prepared by a multi-step coating process involving sputtering, electrospinning, and electrodeposition stages. The STPPST hybrid composites were characterized by field-emission scanning electron microscopy, X-ray diffraction, ultraviolet photoelectron spectroscopy, and infrared spectroscopy. The thermoelectric performance of the prepared STPPST hybrid composites, evaluated in terms of the power factor, electrical conductivity and Seebeck coefficient, demonstrated enhanced thermoelectric efficiency over a reference Sb2Te3 film. The performance of the composite Sb2Te3/PEDOT:PSS-PVP/Sb2Te3 film was greatly enhanced, with σ = 365 S/cm, S = 124 μV/K, and a power factor 563 μW/mK.

Microstructure and Microhardness of Chrome-Oxide Coating Precipitating from Gases Phase Using Liquid of Metal Organic Chrome Compositions

2019 ◽  
Vol 803 ◽  
pp. 60-64
Author(s):  
Taha A. Tabaza ◽  
Safwan Al-Qawabah ◽  
Omar T. Tabaza ◽  
Amjad Al-Sakarneh
Keyword(s):  
Protective Coatings ◽  
Oxide Coating ◽  
Final Phase ◽  
Experimental Conditions ◽  
Chrome Coating ◽  
High Microhardness ◽  
Metal Organic ◽  
Excellent Adhesion ◽  
Effect Of Oxygen ◽  
Gases Phase

In this work, the research team analyzes the effect of oxygen-containing additives on the microstructure and microhardness of coatings of the specimens obtained during applying pyrolytic chrome coating using metal-organic compounds (MOC) in order to obtain protective coatings. The results showed that chromium oxidation in the final phase of the coating process changed the microstructure and mechanical properties of the coating. The resulting coatings exhibit excellent adhesion, high microhardness (6-8 and up to 20-22 GPa depending on the experimental conditions) and better microplasticity, corrosion and wear resistance. In this work the effect of oxidizer on the microstructure and microhardness will be illustrated.

Spraying Distance and Oxidation Resistance of Electrothermal Explosion Sprayed MoSi2-Based Coatings

2010 ◽  
Vol 105-106 ◽  
pp. 409-412
Author(s):  
Shi Xiang Hou ◽  
Zong De Liu ◽  
Dong Yu Liu ◽  
Li Ping Zhao
Keyword(s):  
Oxidation Resistance ◽  
High Speed ◽  
Protective Coatings ◽  
Primary Phase ◽  
X Ray Diffraction ◽  
Electrothermal Explosion ◽  
Temperature Oxidation ◽  
Hardness Tester ◽  
High Microhardness ◽  
Al Coating

Intermetallic compound MoSi2 is useful for protective coatings against high-temperature oxidation. In this study, MoSi2-based coatings were prepared using electrothermal explosion ultra-high speed spraying methods. The spraying distance from electric exploding chamber to substrate are 5mm, 10mm, 15mm and 20mm, respectively. The microstructures, phase structures and hardness of the coatings were investigated by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Vickers hardness tester, respectively. The result indicates that MoSi2 primary phase is synthesized. When spraying distance is 10mm, the coatings have density microstructure, submicron grains and high microhardness. The bonding of coating-substrate is metallurgical. The oxidation resistance of Mo-Si-Al coating is higher than that of Mo-Si coating.

Preparation of OMMT and Light-Colored and Transparent PI/OMMT Hybrid Composite Films

2013 ◽  
Vol 634-638 ◽  
pp. 1985-1989
Author(s):  
Yun Hua Lu ◽  
Zhi Zhi Hu ◽  
Guo Yong Xiao ◽  
Yan Dong ◽  
Hai Jun Chi
Keyword(s):  
Hybrid Composite ◽  
Hybrid Composites ◽  
Composite Films ◽  
Amic Acid ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Aromatic Diamines ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Ft Ir ◽  
Cetyltrimethyl Ammonium

The organo-modified montmorillonite (OMMT) was prepared from Na+montmorillonite (Na+MMT) by cation exchange with cetyltrimethyl ammonium bromide (CTMAB). The light-colored and transparent polyimide (PI) and OMMT hybrid composite films from the solution of poly(amic acid)(PAA) and various amounts (0.25, 0.50, 0.75, 1.00wt%) of OMMT in N, N-dimethylacetamide (DMAc) were prepared. The PAA was synthesized from the reaction of the alicyclic dianhydrides 1,2,3,4-cyclobutanetrtracarboxylic dianhydride (CBDA) and fluorinated aromatic diamines 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene (6FAPB). The OMMT and PI/OMMT hybrid composite films were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), UV-vis transmission spectra and solubility testing. The experimental results showed that the OMMT exhibited a 2.12nm d-spacing value. These obtained PI/OMMT hybrid composites were soluble in typical imide type polar solvent. As the OMMT contents are increased, the transparency of the PI/OMMT hybrid composite films is sacrificed slightly. These PI/OMMT hybrid films are good candidates for potential solar cell flexible substrates.

RETRACTED: Correlation of the Transition Metal Compound Ternary Nitride Thin Films

2014 ◽  
Vol 875-877 ◽  
pp. 605-608
Author(s):  
Yong Jun Jiang
Keyword(s):  
Thin Films ◽  
Transition Metal ◽  
Protective Coatings ◽  
Chemical Reactivity ◽  
Composite Films ◽  
Ternary Systems ◽  
Nanocomposite Films ◽  
Early Transition Metal ◽  
N2 Atmosphere ◽  
Nanocrystalline Composite

Thin films of MXN (M stands for early transition metal and X = Si, Ge, Sn) are studied as protective coatings. To extend the knowledge about the formation of nanocomposite films, various MXN systems have been compared. TiSiN, TiGeN, TiSnN, NbSiN, ZrSiN and CrSiN thin films were deposited by reactive magnetron sputtering, from confocal targets in a mixed Ar/N2 atmosphere. The chemical reactivity of germanium and tin with nitrogen is significantly lower than that of Si and Ti. Therefore, the TiGeN and TiSnN systems are different from TiSiN. Important changes in the morphology and structure of MXNfilms are induced by X addition. Nanocrystalline composite films are formed in all these investigated ternary systems.

Electrophoretic Deposition of Organic - Inorganic Composites for Biomedical Applications

2012 ◽  
Vol 706-709 ◽  
pp. 617-622
Author(s):  
Rong Ma ◽  
Igor Zhitomirsky
Keyword(s):  
Electrophoretic Deposition ◽  
Biomedical Applications ◽  
Room Temperature ◽  
Deposition Time ◽  
Composite Films ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inorganic Composites ◽  
Deposition Yield

Electrophoretic deposition method has been developed for the fabrication of organic-inorganic composite films, containing bioglass and hydroxyapatite in a hyaluronic acid matrix. The film composition and deposition yield were varied by variation of the electrochemical bath composition and deposition time. The films were studied by scanning electron microscopy, thermogravimetric analysis and X-ray diffraction methods. The deposition method offers the advantages of room temperature processing and allows the fabrication of composite films for biomedical applications.

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