Development of Polyamide 6/Ferrite Composites for Absorbers of Electromagnetic Radiation

2010 ◽  
Vol 660-661 ◽  
pp. 922-927 ◽  
Author(s):  
Daniella Cibele Bezerra ◽  
Taciana Regina de Gouveia Silva ◽  
Edcleide Maria Araújo ◽  
Renê Anísio da Paz ◽  
Ana Cristina Figueiredo de Melo Costa
Keyword(s):  
Chemical Composition ◽  
Electromagnetic Radiation ◽  
Dimensional Stability ◽  
Chemical Resistance ◽  
Polyamide 6 ◽  
Good Resistance ◽  
Ferrite Composites ◽  
Excellent Chemical

Composites consist of a mixture or combination of the two or more, micro or macro constituents that differ in shape and chemical composition and, in essence, are insoluble in one another. The polyamide is a polymer that presents dimensional stability, good resistance to impact without notch and excellent chemical resistance. Already the ferrites are absorbers of electromagnetic radiation and have versatility to be used as a composite of ferrites. The composite of polyamide6/ferrite was obtained by mixing 10 and 30wt.% of ferrite added to polyamide 6 in a Torque Rheometer Haake. The objective of this work was to develop of polyamide6/ferrite composites to be used as absorbers of electromagnetic radiation. The results were very promising and showed that occurs interaction between the ferrite and polyamide6.

scholarly journals Thermal and Quasi-Static Mechanical Characterization of Polyamide 6-Graphene Nanoplatelets Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1454
Author(s):  
Pietro Russo ◽  
Francesca Cimino ◽  
Antonio Tufano ◽  
Francesco Fabbrocino
Keyword(s):  
Chemical Resistance ◽  
Experimental Tests ◽  
Polyamide 6 ◽  
Graphene Nanoplatelets ◽  
Strength Parameter ◽  
Melt Compounding ◽  
Static Mechanical ◽  
Thermal And Electrical Properties ◽  
Multifunctional Products

The growing demand for lightweight and multifunctional products in numerous industrial fields has recently fuelled a growing interest in the development of materials based on polymer matrices including graphene-like particles, intrinsically characterized by outstanding mechanical, thermal, and electrical properties. Specifically, with regard to one of the main mass sectors, which is the automotive, there has been a significant increase in the use of reinforced polyamides for underhood applications and fuel systems thanks to their thermal and chemical resistance. In this frame, polyamide 6 (PA6) composites filled with graphene nanoplatelets (GNPs) were obtained by melt-compounding and compared in terms of thermal and mechanical properties with the neat matrix processed under the same condition. The results of the experimental tests have shown that the formulations studied so far offer slight improvements in terms of thermal stability but much more appreciable benefits regarding both tensile and flexural parameters with respect to the reference material. Among these effects, the influence of the filler content on the strength parameter is noteworthy. However, the predictable worsening of the graphene sheet dispersion for GNPs contents greater than 3%, as witnessed by scanning electron images of the tensile fractured sections of specimens, affected the ultimate performance of the more concentrated formulation.

Corrosion of Glazes Coated with Functional Films in Detergent Solutions

2006 ◽  
Vol 45 ◽  
pp. 156-161 ◽  
Author(s):  
Minna Piispanen ◽  
Linda Fröberg ◽  
Thomas Kronberg ◽  
Sami Areva ◽  
Leena Hupa
Keyword(s):  
Surface Roughness ◽  
Everyday Life ◽  
Surface Topography ◽  
Chemical Resistance ◽  
Sol Gel ◽  
Optical Microscope ◽  
Alkaline Environments ◽  
Zirconia Films ◽  
Excellent Chemical ◽  
Detergent Solutions

The goal of this work was to establish the compatibility of mat glazes with functional films known to render the surfaces with self-cleaning or easy-to-clean properties. Glazes with wollastonite, pseudowollastonite, diopside and zircon as the main crystalline phases in the surfaces were coated with fluoropolymer as well as ceramic, sol-gel derived titania and zirconia films. The glazes were soaked in typical detergent solutions used in everyday life up to four days. The surface roughness was measured with confocal optical microscope and the surface was imaged and analyzed with SEM/EDXA. When applied on wollastonite and pseudowollastonite containing glazes the functional films readily reacted in water solutions by pitting of the surface in the vicinity of the crystals. The ceramic titania and zirconia films showed better chemical resistance on wollastonite –free glazes, while the fluoropolymer film corroded in the most alkaline environments. The results indicate that functional films could be used also on rough surfaces without markedly affecting the surface topography. However, the films should be applied only on glazes with an excellent chemical resistance.

scholarly journals Effect of Liquid Ga on Metal Surfaces: Characterization of Morphology and Chemical Composition of Metals Heated in Liquid Ga

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Eun Je Lee ◽  
Min Goo Hur ◽  
Jeong Mun Son ◽  
Jeong Hoon Park ◽  
Seung Dae Yang
Keyword(s):  
Electron Microscope ◽  
Chemical Composition ◽  
Chemical Resistance ◽  
Maximum Amount ◽  
Liquid Gallium ◽  
Heating Process ◽  
X Ray ◽  
Metal Foils ◽  
Scanning Electron

This study investigates the effect of liquid gallium (Ga) on metal foils made of titanium (Ti), niobium (Nb), and molybdenum (Mo). The Ti, Nb, and Mo foils were heated in liquid Ga at 120°C for a maximum of two weeks. After heating, the changes in the morphology and the chemical composition of the metal foils were analyzed by using a field emission scanning electron microscope, energy-dispersive X-ray spectrometer, X-ray diffractometer, and X-ray photoelectron spectrometer. The results of the analysis indicated that the Nb foil showed the minimum adhesion of liquid Ga to the surface while the maximum amount of liquid Ga was observed to adhere to the Ti foil. In addition, the Nb foil was oxidized and the Mo foil was reduced during the heating process. Considering these effects, we conclude that Mo may be used as an alternative encapsulation material for Ga in addition to Nb, which is used as the conventional encapsulation material, due to its chemical resistance against oxidation in hot liquid Ga.

Robust superhydrophobic mesh with excellent chemical resistance for separation of complicated boiling water/oil mixtures

2019 ◽  
Vol 6 (8) ◽  
pp. 085025
Author(s):  
Xinjuan Zeng ◽  
Kangquan Yang ◽  
Kai Yang ◽  
Shouping Xu ◽  
Mengyi Xu ◽  
...  
Keyword(s):  
Chemical Resistance ◽  
Boiling Water ◽  
Oil Mixtures ◽  
Excellent Chemical

Aspects Regarding Repetitive Maintenance Concept in Push Blades for Loading Equipment

2017 ◽  
Vol 907 ◽  
pp. 140-144
Author(s):  
Daniel Tihanov Tanasache ◽  
Carmen Florea ◽  
Daniela Maria Iovanaș ◽  
Emilia Florina Binchiciu ◽  
Aurelia Binchiciu
Keyword(s):  
Chemical Composition ◽  
High Resistance ◽  
Base Material ◽  
Specific Area ◽  
Good Resistance ◽  
Metal Base ◽  
Welding Technology ◽  
Bulk Loading ◽  
Complex Carbides ◽  
Deposited Metal

Preventive repeated maintenance concept provides elaborating, developing and reconditioning, repeatedly, in economic efficient conditions, of the pushing blades that equip bulk loading machines, namely leveling them. Applying the solution implies developing and elaborating active areas in direct contact with processed materials by loading through welding. To this end the base material of the blades is chosen to comply with the addition material afferent to the selected process, for predetermined circle tries, approx. 5 in the present moment.Research conducted to validate the loading through welding technology had primary objectives to obtain material couples base/addition that have a high resistance to intense bending demands, under load, combined with a good abrasion usage resistance or high pressure. The chemical composition of the basic materials in the pushing blades, is afferent to high resistance steels, with a maximum of1.6%Mn, max. 1.5%Cr, max.2%Ni, max. 0.7%Mo and max. 0.005%B. The chemical composition of the deposited material, through welding, falls into steel prescription, type Fe-25%Cr-5%W-Nb-Ti-B, with metallographic structures that have a high content of complex carbides and hardness of minimum 60 HRC. Sclerometric tried and metallographic research of specific area of the deposited metal/base metal ensemble did not highlight any imperfections such as cracks or white sports in the thermal influenced areas.Research regarding exploitation behaviour, of basaltic aggregates in loading conditions or cereals, have shown a good resistance at wear.

Processing of Pet-Silver Nanocomposite Filaments

2016 ◽  
Vol 869 ◽  
pp. 350-355 ◽  
Author(s):  
Marcos Antônio Guerra ◽  
Neide Aparecida Mariano ◽  
Alfeu Saraiva Ramos ◽  
Maria Gabriela Nogueira Campos
Keyword(s):  
Chemical Resistance ◽  
Thermal Analyses ◽  
Crystalline Polymer ◽  
Industrial Applications ◽  
Homogeneous Distribution ◽  
Rheological Characterization ◽  
Silver Nanocomposite ◽  
Fiber Processing ◽  
Master Batch ◽  
Excellent Chemical

Nanoparticles play a fundamental role on nanocomposite properties, as they significantly increase the contact area and allow a homogeneous distribution in comparison to microparticles. Silver nanoparticles (AgNP) have been extensively used in biomedical and engineering applications due to their interesting properties, such as antibacterial activity. Polyethylene terephthalate (PET) is a semi-crystalline polymer and has excellent chemical resistance and thermal stability. Because of its remarkable properties, PET has been used in several industrial applications, such as packaging, electrical, automotive, construction and textile. The aim of this study was to prepare potential antimicrobial PET-AgNP nanocomposite filaments for textile applications. Therefore, AgNP were incorporated in the PET matrix at different concentrations (0.05; 0.10; 0.15; 0.20; 0.25; 0.30; 0.35 and 0.40%) by extruding the PET resin with specific amounts of a 10% (w/w) AgNP/PET master batch. Then, rheological characterization was carried out and filaments were produced for mechanical, optical and thermal analyses. The incorporation of up to 0.20% (w/w) of AgNP in the polymeric matrix has not significantly altered overall properties of PET nanocomposites. Moreover, the nanocomposite incorporated with 0.05% of AgNP demonstrated suitable intrinsic viscosity for fiber processing and PET-like mechanical, thermal and optical properties.

Investigation of Morphological and Mechanical Features of Polyurea

2015 ◽  
Vol 766-767 ◽  
pp. 606-611 ◽  
Author(s):  
T. Arunkumar ◽  
S. Ramachandran
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Chemical Composition ◽  
Ultimate Tensile Strength ◽  
Tensile Test ◽  
Low Temperatures ◽  
Surface Coating ◽  
Chemical Resistance ◽  
Spray Coating ◽  
Coating Technology

Polyurea coatings are very reactive and fast curing even at very low temperatures with exceptional mechanical properties, chemical resistance and durability. Polyurea spray coating technology is used to overcome the initial problems in surface coating such as substrate wetting,mixing and surface finish. The study deals with the analysis of morphology and tensile properties of polyurea coating. The polyurea sample is characterized by using SEM, FTIR and XRD in addition to EDAX to determine the microstructure and chemical composition. Finally Tensile Test was carried out to examine the ultimate tensile strength and young’s modulus of Polyurea using UTM.

scholarly journals Modeling glass-ceramic enamel properties

2002 ◽  
Vol 67 (2) ◽  
pp. 135-142
Author(s):  
Dragica Gavrilovski ◽  
Nikola Blagojevic ◽  
Milorad Gavrilovski
Keyword(s):  
Thermal Stability ◽  
Chemical Composition ◽  
Thermal Treatment ◽  
Glass Ceramic ◽  
Chemical Resistance ◽  
Thermal Characteristics ◽  
Experiment Planning ◽  
Mathematical Experiment ◽  
Treatment Procedures ◽  
Mathematical Experiment Planning

The results of an investigation of the chemical and thermal characteristics of glass-ceramic enamels, derived from the Li2O-Na2O-Al2O3-TiO2-SiO2 system obtained by employing the methods of mathematical experiment planning, are presented in this paper. Adequate mathematical models, showing the dependence of the chemical and thermal stability on the chemical composition of enamel systems, after different thermal treatment procedures, were obtained. Based on the testing carried out, it was concluded that in the obtained glass-ceramic enamels the chemical resistance is decreased, but at the same time, the thermal stability is increased, relative to reference coatings.

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