Study of heat resistance of epoxy matrix modified by phthalimide for protection of vehicles

The perspectives of using new modified polymer-based materials for the restoration of vehicle parts are substantiated in this article. The use of binders based on epoxy diane oligomers is proved to be promising in the formation of anti-corrosion coatings. To improve the properties of epoxy matrices at the preliminary stage of their formation, active additives are introduced. The use of a phthalimide modifier, which contains functional groups active before interfacial interaction, is proved to be promising as well. An epoxy diane oligomer is selected as the binder‘s main component in the formation of composites. The hardener polyethylene polyamine is used for crosslinking the epoxy compositions. It allows to harden materials at room temperatures. The choice of a phthalimide modifier for the improvement of thermophysical properties of the developed materials is substanciated. Heat resistance (according to Martens), glass transition temperature and thermal coefficient of linear expansion of modified epoxy composites are studied. To form a composite material or protective coating with improved thermophysical properties, the modifier phthalimide in the amount of q = 0.25… 0.50 pts. wt. at q = 100 pts. wt. of epoxy oligomer ED-20 should be introduced into the epoxy binder. Based on the tests of thermophysical properties of phthalimide-modified materials, the allowable temperature limits, at which it is possible to use the developed composites, are found.

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GENERATION OF NANO-FILLED EPOXY-POLYESTER COMPOSITE MATERIALS FOR PROTECTION OF ELEMENTS OF VESSEL TECHNICAL MEANS

Scientific Bulletin Kherson State Maritime Academy ◽

10.33815/2313-4763.2020.1.22.154-162 ◽

2020 ◽

Vol 1 (22) ◽

pp. 154-162

Author(s):

M. Brailo ◽

◽

S. Yakushchenko ◽

O. Kobelnik ◽

N. Buketova ◽

...

Keyword(s):

Composite Material ◽

Silicon Dioxide ◽

Heat Resistance ◽

Temperature Coefficient ◽

Thermophysical Properties ◽

Linear Expansion ◽

Technical Equipment ◽

Thermal Coefficient ◽

Coefficient Of Linear Expansion ◽

Pyrogenic Silicon Dioxide

The influence of nanofillers on thermophysical properties of epoxy-polyester composites has been investigated in the work. The filler content (oxidized nanodisperse additive and pyrogenic silicon dioxide) has been varied within q = 0.02…1.0 pts.wt. per 100 pts.wt. of epoxy oligomer ED-20. It has been discovered that the introduction of the oxidized nanodisperse additive in the amount of q = 0.05…0.08 pts.wt. into the epoxy-polyester binder leads to an improvement in the thermophysical properties of the composite. Value of heat resistance (according to Martens) increased from Т = 335 К (for the epoxy-polyester matrix) to T = 346 K at the content of oxidized nanodisperse additive of q = 0.075 pts.wt. Introduction of q = 0.05 pts.wt. of oxidized nanodisperse additive allows to obtain improved values of the temperature coefficient of linear expansion in different temperature ranges: in the region ΔT = 303…323 K – α = 1.0 × 10-5 K-1, in the region ΔT = 303… 373 K - α = 1.9 × 10-5 K-1, in the region ΔT = 303… 423 K – α = 3.4 × 10-5 K-1. It has been determined that the composite material has also improved its heat resistance (according to Martens), which is T = 347 K and the minimum thermal coefficient of linear expansion at the content of q = 0.05 pts.wt. of pyrogenic silicon dioxide nanofiller. Values of the temperature coefficient of linear expansion were: α = 1.0 × 10-5 K-1 in the region (ΔT = 303… 323 K), α = 1.9 × 10-5 K-1 (in the region ΔT = 303… 373 K), Δα = 3.4 ×× 10-5 K-1 (in the region ΔT = 303… 423 K), α = 8.4 × 10-5 K-1 (in the region ΔT = 303… 473 K). It is recommended that in order to form a composite material with improved thermophysical properties to protect the elements of ship technical equipment, it is advisable to introduce the pyrogenic silicon dioxide nanofiller in the amount of q = 0.05 pts.wt. into the epoxy-polyester binder.

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Preparation and properties of high performance phthalide-containing bismaleimide modified epoxy matrices

Journal of Applied Polymer Science ◽

10.1002/app.33588 ◽

2011 ◽

Vol 121 (6) ◽

pp. 3122-3130 ◽

Cited By ~ 19

Author(s):

Xuhai Xiong ◽

Ping Chen ◽

Jinxiang Zhang ◽

Qi Yu ◽

Baichen Wang

Keyword(s):

High Performance ◽

Epoxy Matrices ◽

Modified Epoxy

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COMPOSITIONS BASED ON TRIPLE ETHYLENE-PROPYLENE COPOLYMER AND MODIFIED EPOXY OLIGOMER MIXTURES.

Theoretical & Applied Science ◽

10.15863/tas.2021.05.97.78 ◽

2021 ◽

Vol 97 (05) ◽

pp. 457-459

Author(s):

I.H. Movlaev ◽

◽

G.H. Ibrahimkhalilova ◽

Keyword(s):

Epoxy Oligomer ◽

Ethylene Propylene ◽

Modified Epoxy

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RESEARCH OF THE THERMAL COEFFICIENT OF LINEAR EXPANSION OF METAL-MATRIX COMPOSITE BASED ON ALUMINIUM AND SILICON CARBIDE

Electronic engineering. Series 2. Semiconductor device ◽

10.36845/2073-8250-2019-252-1-48-56 ◽

2019 ◽

Vol 252 (1) ◽

pp. 48-56

Author(s):

A.A. Zolotarev ◽

◽

An.V. Redka ◽

◽

...

Keyword(s):

Silicon Carbide ◽

Metal Matrix Composite ◽

Matrix Composite ◽

Metal Matrix ◽

Linear Expansion ◽

Thermal Coefficient ◽

Coefficient Of Linear Expansion

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Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

Processes ◽

10.3390/pr7110820 ◽

2019 ◽

Vol 7 (11) ◽

pp. 820 ◽

Cited By ~ 3

Author(s):

Yunus ◽

Halim ◽

Wilfred ◽

Murugesan ◽

Lim ◽

...

Keyword(s):

Ionic Liquids ◽

Thermophysical Properties ◽

Molecular Volume ◽

Co2 Absorption ◽

Thermal Coefficient ◽

Empirical Correlations ◽

Protic Ionic Liquids ◽

Thermogravimetric Analyzer ◽

Density Values ◽

Thermal Stability Of

Ionic liquids, which are classified as new solvents, have been identified to be potential solvents in the application of CO2 capture. In this work, six ammonium-based protic ionic liquids, containing ethanolammonium [EtOHA], tributylammonium [TBA], bis(2-ethylhexyl)ammonium [BEHA] cations, and acetate [AC] and butyrate [BA] anions, were synthesized and characterized. The thermophysical properties of the ammonium-based protic ionic liquids were measured. Density, , and dynamic viscosity, , were determined at temperatures between 293.15 K and 363.15 K. The density and viscosity values were correlated using empirical correlations and the thermal coefficient expansion, p, and molecular volume, Vm, were estimated using density values. The thermal stability of the ammonium-based protic ionic liquids was investigated using thermogravimetric analyzer (TGA) at a heating rate of 10 C.min‒1. The CO2 absorption of the ammonium-based ionic liquids were measured up to 20 bar at 298.15 K. From the experimental results, [BEHA][BA] had the highest affinity towards CO2 with the mol fraction of CO2 absorbed approaching 0.5 at 20 bar. Generally, ionic liquids with butyrate anions have better CO2 absorption than that of acetate anions while [BEHA] ionic liquids have higher affinity towards CO2 followed by [TBA] and [EtOHA] ionic liquids.

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Preparation and properties studies of UV-curable silicone modified epoxy resin composite system

Journal of Applied Biomaterials & Functional Materials ◽

10.1177/2280800017753053 ◽

2018 ◽

Vol 16 (1_suppl) ◽

pp. 170-176 ◽

Cited By ~ 4

Author(s):

Zhouhui Yu ◽

Aiyong Cui ◽

Peizhong Zhao ◽

Huakai Wei ◽

Fangyou Hu

Keyword(s):

Heat Resistance ◽

Epoxy Resin ◽

Resin Composite ◽

Curing Kinetics ◽

Resin Content ◽

Silicone Resin ◽

Two Phase ◽

Uv Curable ◽

Humidity Resistance ◽

Modified Epoxy

Introduction: Modified epoxy suitable for ultraviolet (UV) curing is prepared by using organic silicon toughening. The curing kinetics of the composite are studied by dielectric analysis (DEA), and the two-phase compatibility of the composite is studied by scanning electron microscopy (SEM). Methods: The tensile properties, heat resistance, and humidity resistance of the cured product are explored by changing the composition ratio of the silicone and the epoxy resin. Results: SEM of silicone/epoxy resin shows that the degree of cross-linking of the composites decreases with an increase of silicone resin content. Differential thermal analysis indicates that the glass transition temperature and the thermal stability of the composites decrease gradually with an increase of silicone resin content. The thermal degradation rate in the high temperature region, however, first decreases and then increases. In general, after adding just 10%–15% of the silicone resin and exposing to light for 15 min, the composite can still achieve a better curing effect. Conclusions: Under such conditions, the heat resistance of the cured product decreases a little. The tensile strength is kept constant so that elongation at breakage is apparently improved. The change rate after immersion in distilled water at 60°C for seven days is small, which shows excellent humidity resistance.

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Studies on Thermal, Mechanical and Morphological Behaviour of Caprolactam Blocked Methylenediphenyl Diisocyanate and Bismaleimide Modified Epoxy Matrices

International Journal of Chemistry ◽

10.5539/ijc.v1n2p48 ◽

2009 ◽

Vol 1 (2) ◽

Author(s):

Daofang Shi ◽

Mingkang An ◽

Guojun Wang

Keyword(s):

Methylenediphenyl Diisocyanate ◽

Epoxy Matrices ◽

Modified Epoxy

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The ‘instantaneous’ elasticity of active muscle

Proceedings of the Royal Society of London Series B Biological Sciences ◽

10.1098/rspb.1953.0033 ◽

1953 ◽

Vol 141 (903) ◽

pp. 161-178 ◽

Cited By ~ 24

Keyword(s):

Elastic Properties ◽

Long Range ◽

Linear Expansion ◽

Thermal Coefficient ◽

Active Muscle ◽

Absolute Size ◽

Rapid Fall ◽

Experimental Relation ◽

Coefficient Of Linear Expansion ◽

Resting Muscle

When the tension of a muscle contracting isometrically is rapidly lowered, there is an immediate and proportional rise of temperature. This is not due to physiological shortening, which is a relatively slow process, but is directly connected with the fall of tension. A similar effect occurs in any material possessing a normal (positive) thermal coefficient of linear expansion. It is the opposite of what is observed in bodies with long-range rubber-like elasticity. The experimental relation, in active muscle, between the heat (∆ Q ) immediately produced and the rapid fall of tension (-∆ P ) is ∆ Q = 0∙018 l o (-∆ P ), where l o is the standard length of the muscle. The constant 0∙018 is considerably greater than for metals but about the same as for ebonite and wood. In resting muscle, in the range of moderate tensions, the constant is of the opposite sign, and its absolute size is five to ten times as great. Resting muscle, in this range, has rubber-like elastic properties. During active contraction, therefore, the contractile filaments possess normal and not long-range elasticity. The force exerted by active muscle is not of thermokinetic origin. Unlike resting muscle its entropy and its internal energy both decrease when its tension is rapidly lowered. The power of physiological shortening, at a rate depending on the tension, is not directly derived from elastic properties. In normal relaxation after an isometric contraction there is known to be a substantial production of heat. This is derived partly from elastic energy developed earlier during contraction, in the series elastic component: the balance is fully accounted for by the thermoelastic heat resulting from the fall of tension.

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