Papers by Keyword: Epoxy Resin

Abstract: The study used KH560 coupling agent to modify chopped glass fibers for reinforcing glass fiber/epoxy resin composites. As the glass fiber mass fraction increased, tensile, bending, and impact strength initially rose and then declined. Optimal mechanical reinforcement occurred at a 10% fiber mass fraction. SEM analysis revealed a well-integrated interface between glass fibers and the resin matrix, facilitating stress transfer and crack resistance. However, excessive fiber content led to diminished mechanical properties due to poor dispersion. Short-term UV aging significantly altered the composite's color, attributed to UV-induced photooxidation, though glass fibers' chemical stability mitigated deeper oxidation. Water exposure induced resin hydrolysis over time, further reducing mechanical properties. This research provides foundational insights for developing high-performance glass fiber reinforced epoxy resins as alternatives to metal power fittings.

Abstract: The thermal degradation process of layered molybdenum disulfide nanosheets/flake graphite nanosheets/expanded flame retardants/epoxy resins (MDNs/FGNs/IFR/EP) was analyzed using thermogravimetric analysis. The effect of binary nanolayered molybdenum disulfide/flake graphite nanosheets as enhancing flame retardants on thermal stability was studied. The thermal degradation kinetics activation energy of MDNs/FGNs/IFR/EP was calculated using the Coats Redfern method. The mechanism function of MDNs/FGNs/IFR/EP was determined using the Phadnis method, and the thermal degradation mechanism of MDNs/FGNs/IFR/EP was obtained. Binary nanoMD/FG helps to improve the thermal stability of EP.

Abstract: This study examines the utilization of human hair as a reinforcing material in epoxy-based composites. By conducting a series of experiments, the research investigates how various proportions of hair impact the properties of these composites. The results indicate that increasing the amount of hair significantly improves the strength of the materials. This research not only contributes to material engineering by repurposing a waste product but also holds potential for applications in industries such as automotive and aerospace where strong and lightweight materials are crucial.

Abstract: Boron Nitride (BN) filler was modified by an ion beam surface treatment to enhance dispersibility to polar solvent and bond strength with epoxy. Surface treatment of the fillers was conducted by Ion Assisted Reaction (IAR), in which Ar⁺ ion beam is irradiated on the filler surface with energy of 1keV, dose varied from 1x10¹⁴ ~ 5x10¹⁶ Ar⁺ ions/cm² by using Cold Hollow Cathode type ion source and oxygen gas 5-10ml/sec. After the surface treatment, the BN powder were spontaneously dispersed into polar solvent in a visual observation which means the modified surface was changed from hydrophobic to hydrophilic, and the powder were easily mixed with a viscous epoxy resin until 40wt% without thinner (a gelation phenomenon with easy blending into the epoxy resin), but the untreated powder exhibits difficulty in mixing with epoxy resin without the thinner. XPS analysis showed oxygen functional groups (B-ON, BN, etc.) were formed on the surface of BN. It was confirmed the surface modification has a high filling ability of the BN filler with binder and better adhesion with epoxy resin compared to the untreated BN filler.

Abstract: ITER IF coils and the German WX-7 star simulator fusion reactor both use cyanate ester/epoxy resin as the matrix material for their insulation structure. The main reason is that cyanate ester/epoxy resin insulation materials have low-temperature mechanics and radiation resistance, and have extremely low rheological properties and long applicability periods. However, high-energy polymerization will occur when the two are mixed, releasing a huge amount of heat. This study used different molds to prepare cyanate ester/epoxy resin (mass ratio 4:6), and used DSC (Differential Calorimetry Scanning) thermal analyzer and temperature monitoring to study the curing behavior and thermal stability of cyanate ester-modified epoxy resin-based materials. After multiple optimizations, the resin was completely cured within a controllable range, and there was no significant change in the glass transition temperature before and after adjustment.

Abstract: Traditional epoxy coatings used for water pipeline cathodic protection have several shortcomings, including limited availability, high cost, and carcinogenic concerns. To address these challenges, a new, food-grade epoxy coating that is affordable, meets all technical requirements, and is free of carcinogenic substances was developed.The study involved testing various kinds of reinforcing fillers, non-reinforcing pigments, red pigment, and BYK additives to formulate the epoxy-based coating. Curing experiments were then conducted by formulating the coating with a fixed ratio of curing agent and spraying the resins onto mild steel panels for testing.The results demonstrated that the new formulation has good compressive strength, adequate impact resistance, and Shore D hardness in the range of 60-70, which is expected for this type of application. The abrasion resistance of the coatings increased with increasing hardness.Overall, the new food-grade epoxy coating is a promising alternative to traditional epoxy coatings for water pipeline cathodic protection. It is affordable, meets all technical requirements, and is free of carcinogenic substances.Key words: Epoxy Resin, Coating, Food Grade, TETA

Abstract: High-voltage electrical equipment insulation often uses composite materials like epoxy resin, cross-linked polyethylene, polyurethane, and silicone rubber as encapsulation. 3D printing technology offers a more efficient and cost-effective solution, producing intricate elements without cutting and casting. Research shows that 3D printed materials have comparable properties to polymer-based insulation, but further testing is needed to evaluate their resistance to harsh environmental conditions. This research investigates the arc resistance properties of 3D printed insulation materials for outdoor high-voltage applications, assessing their suitability for outdoor applications. The wet and dry arc resistance tests were performed in accordance with ASTM D495-99 and IEC-60587. The present work investigated three varieties of samples: polylactic acid, epoxy resin, and silicone rubber. The results of the tests reveal that polylactic acid test samples have average wet and dry arc resistance times of 2.5 hours and 1.4 seconds, which is less than silicone rubber and epoxy resin. Additional research is required to comprehend the behavior of arc formation in polylactic acid insulation materials for high-voltage 3D printing applications.

Abstract: The adhesive strength and degradation behavior of the Al/resin interface was investigated under high temperature and high humidity conditions. The adhesive strength of the joint without aging was approximately 14 MPa. The value is the same as the Cu/resin joint. With progress of aging at 85°C in 85%R. H., the strength decreased rapidly in the early aging stage and decreased gradually by further aging. The strength of the Al/resin joint was inferior to that of the Cu/resin joint after aging. The fracture mainly occurred in the interface of the joint. The result of Fourier transform infrared spectroscopy analysis for the fracture surface showed that water absorption in the Al/resin joint occurs by aging and causes the degradation of the strength.

Abstract: This study investigated the electrochemical behavior of Ni–Cu alloy plating baths during plating and dealloying reactions. Furthermore, the potential and plating time effects on the shape of three-dimensional structural Ni–Cu alloy plating film and its adhesion to epoxy resin were investigated. Nodules were observed on the surface of the plating film generated at potentials from-0.5 V to-1.0 V. When the plating films formed at potentials of-1.0 V to-1.5 V were dealloyed, the formation of pores was observed. The shear test results showed that the average shear strength of the specimen joined with epoxy resin between two Cu plates with Ni–Cu alloy plating film formed at a potential of-1.0 V was the highest under all conditions.

Abstract: New trend in material engineering are composites with biological-based fillers. On of aim in biological-bases composite is how to use waste from agriculture production i.e. unused secondary products known as residues. The aim of this research is experimental investigation of wear resistance of bio-polymer composite reinforce by cotton post-harvest line residues. These residues come from cotton production as a waste which contain cotton stems and plant roots. Most of these residues are burned as energy source, but residues can find other utilization. Composites based on polymer can solve friction and wear problems in industry for their advantages as self-lubrication, light weight, easy of properties modification, etc. This research is part of wide study dealing with material utilization of post-harvest line residues. Mass loss of wear resistance at composite PCFC 500 with short fibres decrease against the matrix up to 21% on 19.28 mg.