Effects of Liquids on Physicochemical Properties of Fluorosilicone Rubber

2016 ◽  
Vol 717 ◽  
pp. 9-13
Author(s):  
Jun Mei Cheng ◽  
Shu Gao Zhao
Keyword(s):  
Mechanical Properties ◽  
Physicochemical Properties ◽  
High Performance ◽  
Chemical Resistance ◽  
Jet Fuel ◽  
Swelling Properties ◽  
Compression Set ◽  
Sealing Materials ◽  
Fluorosilicone Rubber

An attempt has been undertaken to assess the effect of RP-3 jet fuel and 4109 lubricant on the mechanical, swelling properties and compression set of two kinds of fluorosilicone rubber (FSR) which are self-made and provided by Dow corning, and are marked as FSR A and FSR B respectively. Results showed that FSR B has better chemical resistance and comparable mechanical properties with that of FSR A, and are promising candidates for the development of high performance sealing materials.

scholarly journals Preparation of Multicomponent Biocomposites and Characterization of Their Physicochemical and Mechanical Properties

2020 ◽  
Vol 4 (1) ◽  
pp. 18
Author(s):  
Yuriy A. Anisimov ◽  
Duncan E. Cree ◽  
Lee D. Wilson
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Physicochemical Properties ◽  
In Situ Polymerization ◽  
Structural Parameters ◽  
Dye Adsorption ◽  
Mechanical Analysis ◽  
Scanning Calorimetry ◽  
Swelling Properties

This work focused on a mutual comparison and characterization of the physicochemical properties of three-component polymer composites. Binary polyaniline–chitosan (PANI–CHT) composites were synthesized by in situ polymerization of PANI onto CHT. Ternary composites were prepared by blending with a third component, polyvinyl alcohol (PVA). Composites with variable PANI:CHT (25:75, 50:50 and 75:25) weight ratios were prepared whilst fixing the composition of PVA. The structure and physicochemical properties of the composites were evaluated using thermal analysis (thermogravimetric analysis (TGA), differential scanning calorimetry (DSC)) and spectroscopic methods (infrared (IR), nuclear magnetic resonance (NMR)). The equilibrium and dynamic adsorption properties of composites were evaluated by solvent swelling in water, water vapour adsorption and dye adsorption isotherms. The electrical conductivity was estimated using current–voltage curves. The mechanical properties of the samples were evaluated using dynamic mechanical analysis (DMA) and correlated with the structural parameters of the composites. The adsorption and swelling properties paralleled the change in the electrical and mechanical properties of the materials. In most cases, samples with higher content of chitosan exhibit higher adsorption and mechanical properties, and lower conductivity. Acid-doped samples showed much higher adsorption, swelling, and electrical conductivity than their undoped analogues.

Manufacturing Techniques and Mechanical Properties of Recycle Kevlar®/PET Composite Nonwoven

2012 ◽  
Vol 627 ◽  
pp. 831-834 ◽  
Author(s):  
Ching Wen Lou ◽  
An Pang Chen ◽  
Ya Yuan Chuang ◽  
Jan Yi Lin ◽  
Mei Chen Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Chemical Resistance ◽  
Impact Resistance ◽  
High Modulus ◽  
Machine Direction ◽  
Nonwoven Fabrics ◽  
Polyester Fibers ◽  
Manufacturing Techniques ◽  
Composite Nonwoven

Kevlar® fiber has characteristics of thermostability, high modulus, low elongation, impact resistance, chemical resistance and high performance. Therefore, in this study Kevlar® fiber was used to reinforce the nonwoven fabrics. In this research, the content of the Kevlar® fiber was varied as 0 wt%, 5 wt%, 10 wt%, 20 wt%, and that of 15D PET fiber was changed as 70 wt%, 65 wt%, 60 wt%, 50 wt% accordingly when the Low-Tm polyester fibers was constant as 30 wt%. These fibers were used to manufacture the Kevlar®/PET composite nonwoven by nonwoven processing. Afterwards, the mechanical properties of the Kevlar®/PET composite nonwoven was measured both at cross direction and machine direction.

scholarly journals The Influence of Self-Heating Iron on the Thermal, Mechanical, and Swelling Properties of PDMS Composites for Organic Solvents Removal

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4231
Author(s):  
Mohamed S. A. Darwish ◽  
Laila M. Al-Harbi
Keyword(s):  
Mechanical Properties ◽  
Organic Solvents ◽  
High Performance ◽  
Cluster Formation ◽  
Thermal Source ◽  
Stimuli Responsive ◽  
Iron Particles ◽  
Swelling Properties ◽  
Heating Efficiency ◽  
Self Heating

Volatile organic compounds pollute the environment and pose a serious threat to human health due to their toxicity, mutagenicity, and carcinogenicity. In this context, it is highly desirable to fabricate high-performance poly (dimethylsiloxane) (PDMS) composites to remove organic solvents from the environment using a simple technique. Therefore, in the present study, Fe-PDMS composites were fabricated using a technique based on magnetic induction heating with iron particles serving as a self-heating agent. Under an alternating magnetic field, the iron particles served as a thermal source that assisted in the progression of PDMS crosslinking. The influence of self-heating iron on the properties of the fabricated Fe-PDMS composites was also investigated. The hydrosilation reaction occurring during the crosslinking process was controlled using FT-IR. The heating efficiency of PDMS 1, PDMS 2, and PDMS 3 was studied as the function of induction time (0–5 min) and the function of iron content (0%, 1%, and 30% wt.%). The results revealed that the mechanical properties of the PDMS 2 composite were enhanced compared to those of the PDMS 1 and PDMS 3 composites. The mechanical properties of PDMS 3 were the least efficient due to cluster formation. PDMS 3 exhibited the highest thermal stability among all composites. Furthermore, the swelling behavior of different materials in various organic solvents was studied. PDMS was observed to swell to the greatest extent in chloroform, while swelling to a large extent was observed in toluene, pentane, and petroleum ether. PDMS swelling was the least in n-butanol. The elastomeric behavior of crosslinked PDMS, together with its magnetic character, produces stimuli-responsive magneto-rheological composites, which are quite efficient and suitable for applications involving the removal of organic solvents.

Three decades of auxetic polymers: a review

e-Polymers ◽  
2015 ◽  
Vol 15 (4) ◽  
pp. 205-215 ◽  
Author(s):  
Sukhwinder K. Bhullar
Keyword(s):  
Mechanical Properties ◽  
Future Development ◽  
Biomedical Engineering ◽  
High Performance ◽  
Chemical Resistance ◽  
Natural Sciences ◽  
Advanced Materials ◽  
Design And Technology ◽  
Auxetic Materials ◽  
Reduced Costs

AbstractDevelopments in design and technology in the engineering and medical fields necessitate the use of smart and high-performance materials to meet higher engineering specifications. The general requirements of such materials include a combination of high stiffness and strength with significant weight savings, resistance to corrosion, chemical resistance, low maintenance, and reduced costs. Over the last three decades, it has been demonstrated that auxetic materials offer a huge potential for the fields of engineering, natural sciences, and biomedical engineering, and for many other industries, including the aerospace and defense industries, through their unique deformation mechanism and measured enhancements in mechanical properties. To meet future engineering challenges, auxetic materials are increasingly being recognized as integral components of smart and advanced materials. Although materials with a negative Poisson’s ratio have been known since the early 1900s, they did not capture researchers’ attention until the late 1980s. Since 1991, these materials have been known as auxetic materials. Since then, their benefits and applications have been expanded to all major classes of materials such as metals, ceramics, polymers, and composites, and they are also now being used in engineering applications. The goal of this review was to present the development of auxetic polymers, which were first fabricated in the form of polyurethane foam approximately three decades ago and are now used in the fabrication of non-woven nano/micropolymeric structures. This review could provide useful information for the future development of auxetic polymers.

Preparation and Organic Solvent Resistance of Water Soluble Hydantoin Epoxy/Organic Titanium Chelate Composite Coatings

2016 ◽  
Vol 852 ◽  
pp. 639-645
Author(s):  
Gong Wen Tang ◽  
Zhi Shan Yan ◽  
Xin Huang
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Chemical Resistance ◽  
Composite Resin ◽  
Composite Coatings ◽  
Physical And Mechanical Properties ◽  
Immersion Test ◽  
Water Soluble ◽  
Scanning Calorimetry ◽  
Coating Industry

As worldwide environmental and ecological regulations become strict, water soluble system presents great potential in the new VOC-compliant, high-performance anticorrosive coating systems. In this study, hydantoin epoxy resin (HE) was first synthesized. Then HE/titanium bis (triethanolamine) diisopropoxide (TE) composite resin was obtained by mixing HE and TE at a certain temperature. The structure was characterized by 1H nuclear magnetic resonance (NMR) and fourier transform infrared spectroscopy (FTIR). The curing behavior and thermal stability were assessed with differential scanning calorimetry (DSC) and thermo gravimetry (TG) analysis. The mechanical properties of the cured coatings were discussed under the corresponding standards. The chemical resistance properties were tested by immersion test. Our study revealed that the HE/TE composite resin was water soluble and could be self-cured by heating. It possessed well thermal resistant properties, excellent physical and mechanical properties, and good chemical resistance, which made it suitable for the surface coating industry.

Vulcanizate Properties from a New Perfluoroelastomer

1971 ◽  
Vol 44 (3) ◽  
pp. 660-667 ◽  
Author(s):  
A. L. Barney ◽  
G. H. Kalb ◽  
A. A. Khan
Keyword(s):  
High Performance ◽  
Chemical Resistance ◽  
Jet Fuels ◽  
Air Oxidation ◽  
Compression Set ◽  
Hydraulic Fluids ◽  
Halogenated Solvents ◽  
Low Volume ◽  
Methyl Vinyl Ether ◽  
Organic Fluids

Abstract Vulcanizate properties of a new high performance elastomer, a terpolymer of tetrafluoroethylene, perfluoro (methyl vinyl ether) and a small amount of a third perfluoromonomer containing an active cure site, are described. The material may be compounded with various reinforcing agents (black exhibits the greatest reinforcing power) or as a gum stock. Perfluorinated oils such as Krytox § may be added as plasticizers. The vulcanizates show outstanding chemical resistance to many alkalies, acids, oxidizing agents and reducing agents; outstanding resistance to air oxidation at temperatures in the 400 ° – 550 ° F range; low volume swell in many organic fluids such as ketones, esters, nitriles, hydrocarbons and halogenated solvents, including the proprietary hydraulic fluids and jet fuels; and good high temperature (to 550 ° F) compression set.

Macroprobe Mode for the Study of Segregation in Steels

1990 ◽  
Vol 48 (2) ◽  
pp. 260-261
Author(s):  
Auclair Gilles ◽  
Benoit Danièle
Keyword(s):  
Mechanical Properties ◽  
Spatial Distribution ◽  
High Performance ◽  
Volume Fraction ◽  
Sheet Steel ◽  
Acquisition Time ◽  
Chemical Information ◽  
X Ray ◽  
Accurate Quantitative Analysis ◽  
Optical Micrographs

During these last 10 years, high performance correction procedures have been developed for classical EPMA, and it is nowadays possible to obtain accurate quantitative analysis even for soft X-ray radiations. It is also possible to perform EPMA by adapting this accurate quantitative procedures to unusual applications such as the measurement of the segregation on wide areas in as-cast and sheet steel products.The main objection for analysis of segregation in steel by means of a line-scan mode is that it requires a very heavy sampling plan to make sure that the most significant points are analyzed. Moreover only local chemical information is obtained whereas mechanical properties are also dependant on the volume fraction and the spatial distribution of highly segregated zones. For these reasons we have chosen to systematically acquire X-ray calibrated mappings which give pictures similar to optical micrographs. Although mapping requires lengthy acquisition time there is a corresponding increase in the information given by image anlysis.

Mechanical properties and durability of high - performance concrete for bridge decks

PCI Journal ◽  
2008 ◽  
Vol 53 (4) ◽  
pp. 108-130
Author(s):  
Mohsen A. Issa ◽  
Atef A. Khalil ◽  
Shahidul Islam ◽  
Paul D. Krauss
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Bridge Decks

BERYLCO 25S

Alloy Digest ◽  
1952 ◽  
Vol 1 (3) ◽  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Precipitation Hardening ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
Good Resistance ◽  
Subzero Temperatures ◽  
Endurance Strength ◽  
Wear And Corrosion ◽  
Resistance To Wear

Abstract Berylco 25S alloy is the high-performance beryllium-copper spring material of 2 percent nominal beryllium content. It responds to precipitation-hardening for maximum mechanical properties. It has high elastic and endurance strength, good electrical and thermal conductivity, excellent resistance to wear and corrosion, high corrosion-fatigue strength, good resistance to moderately elevated temperatures, and no embrittlement or loss of normal ductility at subzero temperatures. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-3. Producer or source: Beryllium Corporation.

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