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Experimental Data on Epoxy Resin Samples: Small Partial Discharges at Inception Voltage and Some Thoughts on the Possibility of the Existence of Charging Phenomena Below Inception Voltage

Experimental Data on Epoxy Resin Samples: Small Partial Discharges at Inception Voltage and Some Thoughts on the Possibility of the Existence of Charging Phenomena Below Inception Voltage

In this paper, some results are presented on experiments concerning partial discharges (PD) behavior of epoxy resin samples. The main idea is to see whether a sample with PD at its inception voltage, still presents some tendency to charging effects below inception. An effort is being made to relate the present work with previous publications on the same main idea. The experiment arrangement is three layers of epoxy resin with a void in middle layer. Different level voltages under inception voltage are applied to the arrangement and different PD waves are registered under different level voltages. To make sure that the tendency to charging effects below inception, infrared spectrum analysis is also conducted and the result is content to clarify our objective.

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A Study of the Behaviour of Water Droplets Under the Influence of Uniform Electric Field in Epoxy Resin Samples

A Study of the Behaviour of Water Droplets Under the Influence of Uniform Electric Field in Epoxy Resin Samples

Water droplets on the surface of epoxy resin samples were investigated under the influence of uniform electric fields. Several parameters of water droplets were investigated wrt the flashover voltage of the epoxy resin samples, such as water conductivity, droplet volume, number of droplets as well as the positioning of the droplets regarding the electrodes. The droplet behavior is affected by the above mentioned parameters. Perhaps the most striking conclusion is that the flashover voltage depends more on the positioning of the droplets wrt the electrodes than on the droplet volume and/or number of droplets.

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Experimental Study of Low Cycle Fatigue Properties for Epoxy Resins with Dibutyl Phthalate (Dbp)

References 1. Junrong Jiang, "Research progress in modification of unsaturated polyester resin", Thermosetting Resin(China) 17:22-25, 2002. 2. Tianxin Ma, Bo Jiang, "Effect of plasticizers on properties of epoxy resin", Thermosetting Resin(China) 18:7-9, 2003. 3. Rui Mei, Jun Wang, Junming Li, Hongxiao Si, "Research on the tension-tension fatigue performance of glass fiber reinforced plastic", Fiber Reinforced Plastics/Composites 2: 39-42, 2013. 4. A-ying Zhang, Dongxing Zhang, Dihong Li, Rui

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Modified halloysite as a filler for epoxy resins

: Plastics - Determination of impact strength. Part 2: The instrumental methods. PN-EN ISO 179-2. Poland. Mandalia, T. & Bergaya, F. (2006). Organo clay mineral-melted polyolefin nanocomposites Effect of surfactant/CEC ratio, J. of Physics and Chemistry of Solids , 67, 836-845. doi: 10.1016/j.jpcs.2005.12.007. Ratna, D., Becker, O. & Krishnamurthy, R., (2003). Nanocomposites based on a combination of epoxy resin, hyperbranched epoxy and a layered silicate, Polymer, 44, 7449-7457. doi:10.1016/j.polymer.2003.08.035.

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Magnetic recykling of complex catalysts immobilized on thiol-functionalized polymer supports

., Bączek, N., Pernak, J. & Strzelec, K. (2012). Epoxy resins cured with ionic liquids as novel supports for metal complex catalysts. C.R. Chimie, DOI: 10.1016/j.crci.2012.12.005. 4. Strzelec, K., Bączek, N., Ostrowska, S., Wąsikowska, K., Szynkowska, M.I. & Grams, J. (2012). Synthesis and characterization of novel polythiourethane hardeners for epoxy resins. C.R. Chimie, 15, 1065-1071. DOI: 10.1016/j.crci.2012.09.003. 5. Lashdaf, M., Krause, A.O.I., Lindblad, M., Tiitta, M. & Venalainen, T. (2003). Deposition of palladium and ruthenium

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Influence of epoxy resin curing systems and aluminium surface modification on selected properties of adhesive joints

epoxy resins. Przem. Chem. - Chemical Industry, 93/4:443-448, DOI: dx.medra.org/10.12916/przemchem.2014.443. 5. da Silva, L.F.M. & Lopes, M.J.C.Q. (2009) Joint strength optimization by the mixed-adhesive technique. Int. J. Adhes. Adhes. 29(5): 509-514, DOI: 10.1016/j.ijadhadh.2008.09.009. 6. Banea, M.D. & Da Silva, L.F.M. (2009) Adhesively bonded joints in composite materials: an overview. Proceedings of the Institution of Mechanical Engineers Part L: Journal of Materials: Design and Applications 223(1), 1-18, DOI: 10.1243/14644207JMDA

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Effect of Matrix Viscosity on Rheological and Microwave Properties of Polymer Nanocomposites with Multiwall Carbon Nanotubes

: Ecosustainable Polymer Nanomaterials for Food Packaging, (Eds. C. Silvestre, S. Cimmino), Taylor & Francis Books, Inc., Ch. 3, 2013, 55-86. [16] Kotsilkova, R., E. Ivanov, E. Krusteva. Polymer Nanocomposites of Epoxy Resin and Multiwall Carbon Nanotubes: Processing-Structure-Properties Relationships. In: Mechanics of Nanomaterials and Nanotechnology, (Eds. V. Kavard- jikov, L. Parashkevova, A. Baltov), Sci. Series, Bulgarian Academy of Sciences, Part II, Ch. 1, 2012, 51-90. [17] Kuzhir, P., A. Paddubskaya, A. Plyushch, N. Volynets, S

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Influence of the Hardener Proportion on Mechanical Properties of Adhesive Bonds Used in Agriculture

Abstract

Joining materials by adhesive bonding is used across all industrial branches. The occurrence of adhesive bonds in machine constructions is still more frequent because of the development of adhesives which are able to meet various requirements of designers. This trend is observable also in agriculture - in the construction of agricultural machines. There even exists a cooperation between the companies developing the adhesives and the agricultural machines producers. The production process of machines and equipment must consider a required production tact. Adhesives and the process of their hardening have to meet these requirements. In the sphere of agriculture, epoxy resins hardening based either on hardeners or heating are used. Mechanical properties of two-component epoxy resins depending on variable amount of the hardener starting crosslinking of these reactoplastics are described.

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Special Concrete with Polymers

Abstract

The development of polymeric materials offers new perspectives of science and technology due to their outstanding properties. These properties are obtained either due to the effect of dispersion polymers and their polymerization either due to their intervention in structure formation. They were prepared epoxy resin polymer concrete, Portland cement, coarse and fine aggregate and to evaluate the influence of resin dosage on microstructures and density of such structures reinforced concrete mixtures. The paper detailing the raw materials used in experimental works and structural properties of concrete studied.

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Halloysite reinforced epoxy composites with improved mechanical properties

Abstract

Halloysite nanotubes (HNTs) reinforced epoxy composites with improved mechanical properties were prepared. The prepared HNTs reinforced epoxy composites demonstrated improved mechanical properties especially the fracture toughness and flexural strength. The flexural modulus of nanocomposite with 6% mHNTs loading was 11.8% higher than that of neat epoxy resin. In addition, the nanocomposites showed improved dimensional stability. The prepared halloysite reinforced epoxy composites were characterized by thermal gravimetric analysis (TGA). The improved properties are attributed to the unique characteristics of HNTs, uniform dispersion of reinforcement and interfacial coupling.

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