Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Epoxy

Improvement the Mechanical and Physical Properties of Epoxy–Polyurethane Matrix Resin by Using Kevlar Fiber and ZnO Particles

M.R. Gharkan

Engineering and Technology Journal, 2017, Volume 35, Issue 3, Pages 261-266

This work focuses on the synthesis of hybrid polymer composite matrix materials prepared from the epoxy–Polyurethane resin (Polyprime EP) as matrix reinforced phase by using (5%, 10%, 15% and 20%) Zinc oxide particles and 5% woven roving Kevlar fiber (00-900) kind (49). Mechanical and physical tests such as tensile strength, impact strength, hardness, density, thermal conductivity, and water absorption were done. The results showed increased hardness with increasing volume fraction of ZnO for the ratios (5%, 10%, 15% and 20%). The impact strength was increased for volume fraction of zinc oxide at 15%, modulus of elasticity at 5%, thermal conductivity at 20% and density test at 10%. The stress increased at volume fraction of zinc oxide at 10% and 15%. The water absorption decreased with increasing volume fraction of ZnO additives.

Effect of SiC Particulate on Glass Fibers Reinforced Polymer Composites in Erosive Wear Environment

R.H. Abdel-Rahim; Z.F. Atya

Engineering and Technology Journal, 2017, Volume 35, Issue 2, Pages 118-123

In this study the physical property, mechanical properties and erosion wear of pure epoxy and hybrid composites were studied. Composites were prepared and investigated by Hand lay-up molding. Pure epoxy and hybrid compositions were prepared, 4% and 8% volume fractions of glass fibers as reinforcement and 4% and 8% of SiC as filler particles. The investigated physical property is density while the mechanical property was hardness. Solid particles erosion wear tests are also carried out. The experimental results showed that increased volume fraction of glass fibers to (8%) led to increase the (density). The maximum density is equal (1.661gm/cm3). Hybrid composite with (Epoxy +8%GF+8%SiC) has the maximum hardness of (82) shore D. The particle-contained water jet type experimental erosion test results that the reinforcement volume fraction as well as particles distribution and bonding has considerable effect on the wear of epoxy composites. It was found that the better resistance was for hybrid composites (Epoxy+8%GF+4%SiC) at angle 30°, erodent size 800 μm, and time 10 hour.

A Study of the Chemical Resistance and Hardness of Epoxy Reinforced by Magnesium Oxide and Charcoall Activated Particles

Nabil KadhimTaieh

Engineering and Technology Journal, 2016, Volume 34, Issue 5, Pages 950-958

In this research, some samples from Epoxy with Magnesium oxide and charcoal activated Particles as filler in different weight percent (1, 3, and 6) wt. % have been prepared. Chemical resistance test has been done using simple immersion test in different periods of time and the immersion done in different solutions (1N NaOH, 1N HCL and 25 g of NaCl per litter of distilled water). Shore (A) hardness tests were carried out on the prepared samples before and after the immersion into distilled water, (1N HCl) acid, (1N NaOH) and 25 g of NaCl per litter of distilled water with normality (1). The results exhibited increase in chemical resistance and hardnessvalues increase with increasing magnesium oxide and charcoal activated ratio. The maximum hardness was observed in the case of epoxy -6wt% MgOcomposites i.e. 108.8 and least chemical resistance in the case of pure epoxy being 4.885% in NaOH.

Preparation and Studying the Fracture Toughness of Laminate Composites

Awham M. Hameed; Mays Sabah Mahdi

Engineering and Technology Journal, 2016, Volume 34, Issue 4, Pages 451-461

Binary polymer blend was prepared by the mechanical mixing of epoxy resin (EP) with polycarbonate (PC) in different weight ratios of (0, 5, 10, 15 and 20%). Charpy impact test was carried out on these blends to determine the values of impact strength (I.S). It was found that the blend of the ratio (20wt. %) of PC has the highest (I.S) compared with other ratios. For this reason, this percentage of mixing was selected to fabricate the composite materials. Hand lay-up method was utilized to synthesize the (single and hybrid) laminate composites with fiber volume fraction (Ф=15%). Glass and Kevlar fibers were used to reinforce the epoxy and its polymer blend with different sequences of skin and core layers of the composite. The values of Young's modulus (E), impact characteristics (I.S, Gc, Kc) and hardness were determined for these composites. It is found that the values of (E) and hardness decrease while the values of material toughness (Gc) increase with increasing the blending ratio of the polymer blend. It can also be noticed that the composite reinforced with Kevlar fibers records the highest value of (Gc) compared with other composites.

Effect of Carbon Nanotube on Damping Characteristic of Epoxy Polysulfide Blend Composite

Adnan Neama Abood; Ibtihal. A. Mahmood; Ekhlas Edan Kader

Engineering and Technology Journal, 2016, Volume 34, Issue 1, Pages 73-84

In a Nano-composite structure, it is anticipated that high damping can be achieved by taking advantage of the interfacial friction between the nanotubes and the polymer. The purpose of this paper is to investigate the structural damping characteristics of polymeric composites containing Carbon nanotubes (CNTs) with various amounts with polysulfide rubber (PSR) . The damping characteristics of the specimens with 0 wt% and 0.6 wt% Carbon nanotube contents were computed experimentally. Through comparing with neat resin specimens (epoxy, epoxy +PSR), the study showed that one can enhance damping by adding CNTs fillers into polymeric resins. Similarly experiment showed that the maximum value of damping ratio was obtained at 0.4 wt% CNTs.

Absorption coefficient measurement of bremsstrahlung radiation in nano composite

Noor M. Aowd; Hayder S.Hussain

Engineering and Technology Journal, 2015, Volume 33, Issue 7, Pages 1258-1266

In The present work has been prepare samples of polymer and the formation of composite material at different rates (20%, 50% &70%) of nano lead to clarify the difference in the spectrum absorption bremsstrahlung rays through the process of exponential equations graphic representation of the rate correction as a function of energy within the range (0.1 –1.7) MeV using NaI(Tl) energy selective scintillation counter with 90Sr/90Y negative beta source. It was getting also attenuation coefficient of the prepared samples to the same range of energy through graphic representation of natural allegartm count rate as a function of the thickness of absorbent material as the gradient relationship diagrams represents absorption coefficient. The result shows a directly relationship, between the thickness of the absorbent material and the absorption factor. The result, also show that, a reversal relationship, between the absorption factor and the energy of beta particle. The results shows that , the samples prepared of good absorption for beta particles and absorb bremsstrahlung rays and this efficiency is relatively unchanged according to the proportion of nano lead additives which shows a positive impact of the materials prepared in the process of radiation shielding.

Mechanical Properties for Polymer Hybrid Composites Reinforced by Fibers and Particles

Ruaa Haitham Abdel-Rahim

Engineering and Technology Journal, 2015, Volume 33, Issue 3, Pages 635-643

The Mechanical properties of hybrid composites based on epoxy resin (ER) filled with metal powders (Al) and Glass fibers (GF) are studied. The specimens are prepared using hand lay-up techniques according to ASTM standard for different volume fractions of fiber, particles& matrix material. Glass fibers (GF) are one of the most useful filler materials in composites, its major use being the manufacture of components in the aerospace, automotive, and leisure industries. The epoxy was reinforced with GF:( metal powders)in the ratio 10%:40%, 20%:30%, 30%:20%, and 40%:10%. It was observed that in the ratio 40%:10% has the maximum(UTS), fracture strength, flexural strength, fracture toughness and hardness increase with the increase of volume fraction of fibers when compared to unfilled epoxy.

Mechanical, Thermal and Wear Characteristics of Polymer Composite Material Reinforced with Calcium Carbonate Powder

Aseel B. Al-Zubaidi; Ahmed A. Al-Tabbakh; HanaaA. Al-Qaessy; Ragad N. Al-Kaseey

Engineering and Technology Journal, 2014, Volume 32, Issue 3, Pages 519-532

Quick mast–105 is a well-known epoxy-based adhesive used in fabric reinforcement, bonding of wooden parts and variety of metals. Its mechanical and thermal properties are still limiting factors for extended technological and industrial applications. Enhancement of mechanical, wear and thermal characteristics of this epoxy resin using a cheap filler of CaCO3powder is the focus of the present study. The mechanical properties are demonstrated in terms of the flexural modulus, hardness and impact strength of the reinforced cured compound while thermal properties are presented through thermo gravimetric analysis and thermal conductivity coefficient. Results show that addition of 15% by weight of CaCO3 to the epoxy resin improves the mechanical properties and the thermal resistance of the end product paving the way for wider applications in industry and technology. Wear characteristics show that the reinforced product is suitable for high-speed applications.

Studying of Wear Rate for Ternary Polymer Blends under the Influence of Chemical Solutions

Ban Ayyoub Yousif; Balkees M. Dhyaa

Engineering and Technology Journal, 2013, Volume 31, Issue 7, Pages 809-819

This work has been done with use of Epoxy and Novolac resins mixed with either polyurethane (PUR) or polysulphide(PSR) rubbers to compose ternary polymer blends. Two groups of samples are prepared:
1. Blend A (70% Epoxy +15%Novolac+15%PUR).
2. Blend B (60% Epoxy +20% Novolac +20% PSR).
These blends were tested by wear instrument, This test is carried out on samples under the influence of normal conditions (room temperature) and after immersion of blend samples in chemical solutions (H2O, H2SO4 and KOH) for (15, 30 and 45) days. The normality for these chemical solutions is (0.2N). After immersion the blend samples in chemical solution, their wear resistance decreased. The properties of blend that contains polyurthane rubber were affected more. The test results are affected by all the chemical solutions, but the alkaline solution KOH is the most effective solution. For wear test, results show that wear rate increases with increasing applied load, and increases or decreases with sliding velocity (depending on if it is high or low respectively).

Study of The Wear Rate of Some Polymer Materials In Different Conditions

Awham M. H; Sadeer M. M; Bushra H. M

Engineering and Technology Journal, 2010, Volume 28, Issue 16, Pages 5165-5170

The current investigation is interested by study of the wear phenomenon for two polymeric materials (Epoxy and Unsaturated polyester) resins, the prepared specimens were tested at room temperature by using two different loads(10,20)N for various testing times with different sliding distances. The resulted wear rates were calculated for each sample apart with. Variation the previous variables. To produce more precise idea about the wear characteristics of both above materials when immersed them in water environment, the study of wear rates was carried out for different immersion times at different temperatures when the above mentioned variables were fixed. It was found after comparing the results which obtained from the wear test in air that
Epoxy resin undergoes higher wear rates than unsaturated polyester resin in general with variation the testing parameters, while the results of immersion in water which acts as plasticizing factor for polymers exhibited different effect on the wear behavior of the materials under study.