Local Dissipative Processes in the Epoxy Component

2021 ◽  
Vol 899 ◽  
pp. 688-693
Author(s):  
Viktor A. Lomovskoy ◽  
Anna S. Shorshina ◽  
Igor D. Simonov-Emelyanov ◽  
Anastasia A. Razzhivina
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Epoxy Resins ◽  
Chemical Resistance ◽  
Physical And Mechanical Properties ◽  
Dissipative Processes ◽  
High Adhesion

It is known that epoxy resins (ES) and materials based on them are widely used in various areas of natural economy due to their valuable properties: low shrinkage during curing, high adhesion to various materials, chemical resistance, good physical and mechanical properties, and excellent dielectric properties [1].

scholarly journals Effect of Filler Nature on Chemical Resistance and Microhardness of Epoxy Composite Films

2015 ◽  
Vol 16 (3) ◽  
pp. 528-533
Author(s):  
G. Martinyuk ◽  
O. Aksimentyeva ◽  
N. Skoreiko ◽  
V. Zakordonskyi
Keyword(s):  
Mechanical Properties ◽  
Chemical Resistance ◽  
Filler Content ◽  
Epoxy Composite ◽  
Composite Films ◽  
Physical And Mechanical Properties ◽  
Epoxy Composites ◽  
Mineral Filler ◽  
Operating Characteristics ◽  
Mineral Fillers

We investigated the processes of water absorption, chemical stability and microhardness of films of epoxy composites that contained as the polymer matrix the epoxy resin UP-655 and mineral fillers: graphite, mica, aluminum oxide at their content (0 - 30 % mass). It found that introduction of mineral fillers significantly affects on all complex of operating characteristics of the films. Increase of filler content, especially mica, to 20 %, resulting in slower process and reducing the quantity of absorbed moisture by films. In the study of physical and mechanical properties of filled epoxy composites was established that the introduction of mineral filler significantly affects their microhardness, and the nature of the exposure is determined by the type and filler content.

The Performance Study of Waterborne Damping Coating

2015 ◽  
Vol 1088 ◽  
pp. 444-448
Author(s):  
Xiao Wang ◽  
Pei Min Hou ◽  
Yuan Hao Xu ◽  
Jian Lei
Keyword(s):  
Mechanical Properties ◽  
Chemical Resistance ◽  
Physical And Mechanical Properties ◽  
Acrylic Resin ◽  
Damping Factor ◽  
Damping Properties ◽  
Performance Study ◽  
Excellent Performance

In this paper, waterborne damping coating with excellent performance was prepared by self-made acrylic resin, and its physical and mechanical properties, chemical resistance, and damping properties (damping factor) were studied.

scholarly journals Improved epoxy thermosets by the use of poly(ethyleneimine) derivatives

2017 ◽  
Vol 2 (8) ◽  
Author(s):  
Cristina Acebo ◽  
Xavier Ramis ◽  
Angels Serra
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resins ◽  
High Performance ◽  
Polymer Network ◽  
General Purpose ◽  
High Adhesion ◽  
Hyperbranched Poly ◽  
Fiber Reinforced Materials ◽  
Wide Range ◽  
Good Heat

Abstract Epoxy resins are commonly used as thermosetting materials due to their excellent mechanical properties, high adhesion to many substrates and good heat and chemical resistances. This type of thermosets is intensively used in a wide range of fields, where they act as fiber-reinforced materials, general-purpose adhesives, high-performance coatings and encapsulating materials. These materials are formed by the chemical reaction of multifunctional epoxy monomers forming a polymer network produced through an irreversible way. In this article the improvement of the characteristics of epoxy thermosets using different hyperbranched poly(ethyleneimine) (PEI) derivatives will be explained.

scholarly journals Cationic UV-Curing of Epoxidized Biobased Resins

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 89
Author(s):  
Camilla Noè ◽  
Minna Hakkarainen ◽  
Marco Sangermano
Keyword(s):  
Mechanical Properties ◽  
Organic Compound ◽  
Epoxy Resins ◽  
Chemical Resistance ◽  
State Of The Art ◽  
Uv Curing ◽  
Building Blocks ◽  
Uv Curable ◽  
Curing Conditions ◽  
Volatile Organic

Epoxy resins are among the most important building blocks for fabrication of thermosets for many different applications thanks to their superior thermo-mechanical properties and chemical resistance. The recent concerns on the environmental problems and the progressive depletion of petroleum feedstocks have drawn the research interest in finding biobased alternatives. Many curing techniques can be used to obtain the final crosslinked thermoset networks. The UV-curing technology can be considered the most environmentally friendly because of the absence of volatile organic compound (VOC) emissions and mild curing conditions. This review provides an overview of the state of the art of bio-based cationic UV-curable epoxy resins. Particular focus has been given to the sources of the bio-based epoxy monomers and the applications of the obtained products.

Diopside-Based Glass-Ceramics from Chrysotile Asbestos Tailing

2012 ◽  
Vol 427 ◽  
pp. 26-31 ◽  
Author(s):  
Wen Jin Ding ◽  
Tong Jiang Peng ◽  
Ji Ming Chen
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Chemical Resistance ◽  
Glass Ceramics ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Chrysotile Asbestos ◽  
Optimum Procedure ◽  
Produce Glass ◽  
Resistance Tests

By utilizing chrysotile asbestos tailing from Shannan ore in Sichuan as the main raw material, diopside-based glass-ceramics were successfully synthesized in the laboratory by adding some limestone, quartz sand, Al2O3, H3BO3, Na2CO3 and CaF2. The optimum procedure for glass-ceramics was as follows: melting at 1400 for 60 min, sintering at 1100 for 120 min. Through the tests of physical and mechanical properties, the glass-ceramics materials with more crystalline phase had high density, fine performance of resisting compression (366MPa) and negligible water absorption. Through chemical resistance tests, the glass-ceramics samples showed strong corrosion resistance. Overall result indicated that it was a feasible attempt to produce glass-ceramics materials for building and decorative materials from chrysotile asbestos tailing.

scholarly journals Manufacture and Characterization Physical and Mechanical Properties of Bioveneer Based Ark Clam Shells Composite

2019 ◽  
pp. 132-140
Author(s):  
Evi Mariani M ◽  
Kerista Tarigan ◽  
Timbangen Sembiring
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Raw Materials ◽  
Brinell Hardness ◽  
Physical And Mechanical Properties ◽  
Second Step ◽  
Compression Method ◽  
Hydroxyapatite Powder ◽  
Dry Mixing

Composite materials have been created for the applications of dental veneer from a mixture of raw materials : hydroxyapatite (HAp) powder from ark clam shells and epoxy resins by cold compression method with variations of composition hydroxyapatite (HAp) powder : epoxy resin (75 : 25)%wt, (80 : 20)%wt, (85 : 15)%wt, (90 : 10)%wt, dan (95 : 5)%wt. Sampling is created in three steps. The first step of ark clam shells powder is treated by smoothing it with a particle size of 200 mesh and heated at 900oC for 2 hours after it had been synthesized into hydroxyapatite (HAp) powder. The second step of the filler (hydroxyapatite powder) is mixed with dry mixing and then mixed with epoxy resin as a matrix. The third step of the homogeneous mixture is then inserted into the mold and compacted by heat to be more dense with pressure of 300 MPa or 3 ton held for 5 minutes at 27°C. The characterization results showed that the optimum composition of hydroxyapatite powder: epoxy resin (75 : 25)%wt with density value 0,1185 x 103 kg/m3, water absorption 1,163%, composed of -PO4 (phosphate), -CO3 (carbonate) and HOH groups. Mechanical properties with fracture strength 116 MPa, tensile strength 66,12 MPa, modulus of elasticity 3297,99 MPa and brinell hardness 75,87 HBR whose characterization results have met the conventional dental veneer standards.

Corrective Maintenance and Hardening of Agricultural Machinery Parts

2020 ◽  
Vol 836 ◽  
pp. 158-167
Author(s):  
S.D. Polischuk ◽  
Yu.A. Stekolnikov ◽  
D.G. Churilov ◽  
N.V. Byshov ◽  
S.N. Borychev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Base Material ◽  
Reverse Current ◽  
Physical And Mechanical Properties ◽  
Deposition Process ◽  
Agricultural Machinery ◽  
High Adhesion ◽  
Formed Precipitate ◽  
Industrial Use ◽  
Impulse Current

The article presents information on the technological characteristics and industrial use of chroming electrolytes. The modern electrochemical technologies of repairing worn-out parts of agricultural machinery are considered. Particular attention is paid to the use of chrome plating methods making possible to increase the durability and reliability of the parts recovered in electrolytes of different composition, allowing to obtain coatings with high physical-mechanical properties that determine their suitability for the operation in the process of use for their intended purpose. The use of self-regulating dilute chroming electrolytes makes possible to increase the productivity of the deposition process of chromium coatings significantly, to obtain high-quality coatings of chromium and iron, and high adhesion to the base material - carbon, alloyed steels, and cast iron. The deposition of metals using reverse, pulsed currents with adjustable anodic-cathodic ratio of amplitude values and its duration allows to influence electro crystallization, control the structure, texture and roughness of the formed precipitate, which makes possible to get with predetermined functional physical and mechanical properties for specific repair conditions and subsequent operation in agricultural machinery. The following modes are recommended for brilliant coatings: when reverse current τ (cat) / τ (an) = 50-70, τ (cat) = 4-7 min, D(cat) = 40-100 А / dm2, D(cat) / D(an) = 3-4, Т = 60-65 ° С; when impulse current D(cat) = 40-100 А / dm2, Т = 60-65 ° С, τ (imp) = 1.5-2.5 min, τ (pauses) = 5-10 sec., impulse ratio 1.07-1.15.

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