scholarly journals Properties of composite materials based on epoxy resin modified with dibutyltin dibromide

2021 ◽  
pp. 118-125
Author(s):  
K.M. Sukhyy ◽  
◽  
E.A. Belyanovskaya ◽  
A. Nosova ◽  
M.K. Sukhyy ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Composite Materials ◽  
Epoxy Resin ◽  
Crosslinking Density ◽  
Strength Properties ◽  
Short Exposure ◽  
Deformation Capacity ◽  
Antifouling Coatings ◽  
Different Temperatures ◽  
Properties Of Composites

A tin-bromine-containing resin was prepared by the interaction of industrial ED-16 epoxy resin with dibutyltin dibromide. A comparative study of the physical, mechanical and relaxation properties of composites based on the original and modified resins cured at different temperatures has been carried out. It has been shown that the composite materials based on a modified resin are characterized by lower values of tensile strength, elastic modulus, fracture work and glass transition temperature as compared with the samples based on the original epoxy resin. The effect of water on the deformation and strength properties of composites was studied. A complex mechanism of the influence of moisture sorbed by the polymer on the complex of properties has been established, which may result from the imposition of the effects of plasticization and additional curing of the epoxy matrix. At short exposure times, the effect of the sorbed liquid is mainly aimed at weakening the intermolecular interaction in the sample, as a result of which its tensile strength decreases and its deformation capacity increases. At long exposure times, post-curing processes prevail, leading to an increase in the crosslinking density and, as a consequence, to a decrease in deformation capacity and an increase in the strength index. It has been shown that epoxy composites containing resin modified with dibutyltin dibromide are characterized by increased fungitoxicity and fire resistance. The studied polymers can be considered as promising for the production of antifouling coatings for hydraulic equipment on their basis.

Evaluating Performance of Composite Materials for MHK Applications

2011 ◽  
Author(s):  
David A. Miller ◽  
John F. Mandell ◽  
Daniel D. Samborsky
Keyword(s):  
Tensile Strength ◽  
Composite Materials ◽  
Transverse Direction ◽  
Sea Water ◽  
Longitudinal Direction ◽  
Strength Properties ◽  
Material Strength ◽  
Montana State University ◽  
Testing Protocol ◽  
Initial Results

Montana State University (MSU) has a compilation of material systems, environmental chambers, and mechanical testing equipment to determine composite materials performance and failure characteristics. Mechanical characterization of composite systems will provide direct quantification of the materials under consideration for Marine Hydro Kinetic (MHK) designs that were initially developed for the wind turbine industry. The work presented herein represents the testing protocol development and initial results to support investigations on the effect of sea water absorption on material strength. A testing protocol for environmental effects has been developed for the resin infused in-house fabricated laminates. Unidirectional ([0] and [90]) test samples of 2-mm and 6-mm thickness were be submerged for 1000 hours in synthetic sea water at 40°C with the weight recorded at time intervals over the entire period. After 1000 hours of conditioning, coupons were placed in the synthetic sea water at 20°C until testing. Static compressive and tensile strength properties at temperatures of 5°C, 20°C and 40°C were collected. These initial results show trends of reduced tensile and compressive strength with increasing moisture and temperature in the 0° (longitudinal) direction. In the 90° (transverse) direction, compression strength decreases but tensile strength is little affected as temperature and moisture increase. Elastic modulus (E) is little affected in the longitudinal direction but decreases in the transverse direction.

scholarly journals Physicomechanical Properties of Epoxyurethane Biocomposites Strengthened with Hemp Wood Core

2021 ◽  
Vol 9 (1) ◽  
pp. 9-18
Author(s):  
Tetian Samoilenko ◽  
Larysa Yashchenko ◽  
Natalia Yarova ◽  
Oleh Babich ◽  
Oleksandr Brovko
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Soybean Oil ◽  
Epoxy Resin ◽  
Physicomechanical Properties ◽  
Polymer Matrices ◽  
Epoxidized Soybean Oil ◽  
Maximum Content ◽  
Properties Of Composites

Hemp wood core (HWC) filled Si-containing epoxyurethane biocomposites, in which diane epoxy resin was replaced with epoxidized soybean oil (ESO), were obtained. It was shown that the tensile strength of ESO-containing polymer was higher, and the flexural strength was lower than those of original polymer. HWC was especially effective strengthening filler for modified epoxyurethanes, because in that case mechanical properties of composites were higher than those of unfilled polymer matrices. Particularly, flexural and tensile strength of unfilled epoxyurethane with maximum content of ESO were 8.1 and 6.8 MPa respectively, while in corresponding composite they reached 17.3 and 15.7 MPa.

Physico-Mechanical Properties of Banana Fiber Reinforced Polymer Composite as an Alternative Building Material

2015 ◽  
Vol 650 ◽  
pp. 131-138 ◽  
Author(s):  
Himadri Das ◽  
Pallav Saikia ◽  
Dipul Kalita
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Composite Materials ◽  
Flexural Strength ◽  
Polymer Composite ◽  
Natural Fiber ◽  
Strength Properties ◽  
Banana Fiber ◽  
Elongation At Break ◽  
Ldpe Composites

Utilization of natural fiber as reinforcing material is the latest trend in polymer science to produce higher strength with lower weight composite materials having wide range of applications. As a natural fiber, banana fiber is getting importance in recent years in the reinforcement arena of polymer composite. Two species of banana vizMusa sapientumandMusa paradisicaavailable in North East India were selected considering their higher fiber yield and adequate strength properties of the fibers. The chemical compositions, spectroscopic and thermal properties of these fibers were studied in order to study their suitability for commercial exploration. Low density polyethylene (LDPE)-banana fiber reinforced composites were prepared using hydraulic hot press. Physico-mechanical properties (e.g. tensile strength, flexural strength, elongation at break, Young's modulus) of the prepared composites were determined. The tensile strengths and flexural strengths of the composites increased while using LDPE 10 to 30 % of the fiber and then started to decrease gradually. Young moduli of the composites increased with the increase of fiber mass. Water absorption also increased accordingly with the increase of the fiber weight. The elongation at break decreased with increasing fiber quantity. The mechanical strength properties of chemically treated banana fiber-LDPE composites were slightly higher than the mechanically extracted fiber-LDPE composites. Structural analyses of the treated fibers were carried out by FTIR and XRD. These studied revealed due to the removal of noncellulosic constituents such as hemicelluloses and lignin the crystalline properties of the fibers were increased. All the properties of composite like tensile strength, flexural strength, water absorption capacity etc. plays a significant role in these polymer composite materials. Hence it can be concluded that banana fiber can be used as reinforced agent successfully in the composite industry as a sustainable building material.

Improvement in the Tensile Strength of Epoxy Resin and Hemp/Epoxy Resin Composites Using Carbon Nanotubes

2010 ◽  
Vol 93-94 ◽  
pp. 497-500 ◽  
Author(s):  
Haruthai Longkullabutra ◽  
Wandee Thamjaree ◽  
Wim Nhuapeng
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Epoxy Resin ◽  
Resin Composites ◽  
Hemp Fiber ◽  
Epoxy Resin Composites ◽  
Vibration Milling ◽  
Scanning Electron ◽  
Properties Of Composites

An experimental was investigated the condition of reinforcement of epoxy resin and hemp fiber/epoxy resin composites with carbon nanotubes (CNTs). The CNTs adding nanopowder were vibrated via the vibration milling technique for 6-48 h. Different volume percentages of CNTs were dispersed for hemp/epoxy resin composites. To compare properties of composites sample, CNTs were also added into epoxy resin for reference. Tensile strength of both specimens was tested. The significantly adding of CNTs and its dispersion in polymer matrix were investigated by scanning electron microscope (SEM). The results indicate that adding the milled CNTs can improve tensile properties of composites.

scholarly journals The modification of an epoxy resin by natural plant materials

2020 ◽  
Vol 31 (1) ◽  
pp. 14-20
Author(s):  
Joanna Masiewicz ◽  
Martyna Roszowska-Jarosz ◽  
Marcin Kostrzewa ◽  
Aleksandra Jasik ◽  
Paulina Krawczyk
Keyword(s):  
Epoxy Resin ◽  
Bending Strength ◽  
Strength Properties ◽  
Critical Stress Intensity Factor ◽  
Plant Materials ◽  
Three Point Bending ◽  
Hemp Fibres ◽  
Protection Cost ◽  
Positive Effect ◽  
Properties Of Composites

Abstract The article presents the results of research on the modification of Epidian 5 epoxy resin by introducing natural modifiers. It's easy accessibility and biodegradability has a positive effect on environmental protection, cost-effectiveness of the process, useful and strength properties of composites. Still looking for the best solutions in the production of epoxy composites combining these features, we have attempted to compare and select the most optimal natural modifier. The epoxy resin was modified with collagen, hemp fibres, cellulose from pepper extraction residues. The amount of amine hardener suggested by the manufacturer was added to the composition. Each composition was cured at room temperature for 24 hours and then cured at 80°C for 3 hours. The prepared composites were subjected to impact assessment additions for mechanical properties, impact strength, three-point bending strength, critical stress intensity factor and gel time.

scholarly journals Low-temperature tension properties of glass-epoxy composite materials

2005 ◽  
pp. 123-134
Author(s):  
Slavisa Putic ◽  
Marina Stamenovic ◽  
Branislav Bajceta ◽  
Predrag Stajcic ◽  
Srdjan Bosnjak
Keyword(s):  
Tensile Strength ◽  
Composite Material ◽  
Composite Materials ◽  
Room Temperature ◽  
Epoxy Composite ◽  
Epoxy Composites ◽  
Tension Properties ◽  
Different Temperatures ◽  
Stereo Microscope

The aim of this paper was to present the determination of tensile strength Rm and modulus of elasticity Et of glass-epoxy composites at two different temperatures (at room temperature t=20?C, and at t =?50?C). Standard mechanical testing was carried out on glass woven-epoxy composite material with different structures (two specific weights of reinforcement, 210 g/m2 and 550 g/m2) and orientations (0?/90? and ?45?). Micromechanical analysis of failure was performed on a stereo microscope and SEM in order to determine real models and mechanisms of crack.

Physics-mechanical and viscoelastic properties of polymer compositions based on synthetic oligomer ED-20 and epoxidized soybean oil

2021 ◽  
Vol 43 (2) ◽  
pp. 95-102
Author(s):  
L.A. Gorbach ◽  
◽  
N.V. Babkina ◽  
O.G. Purikova ◽  
A.V. Barantsova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Soybean Oil ◽  
Epoxy Resin ◽  
Viscoelastic Properties ◽  
Relative Elongation ◽  
Crosslinking Density ◽  
Epoxidized Soybean Oil ◽  
Premature Failure ◽  
Epoxy Composition

The work was aimed at studying the effects of combining epoxidized soybean oil (ESO) with standard bisphenol type A epoxy resin (ED-20). The ED-20 / ESO ratios were 100/0, 90/10, 95/15 and 80/20 (wt%). The system was cured with amine hardener mono(cyanethyl) diethylenetriamine (MCDT), triethanolamine (TEA) and mixture thereof (TEA + MCDT) at different curing temperatures. The choice was based on the hardener’s ability to open oxirane cycles, form a spatial network and initiate several parallel reactions. The viscoelastic properties, mechanical properties (tensile strength and elongation) were studied the density of obtained ED-20 / ESO samples was determined. The results showed that the introduction of ESO into epoxy resin ED-20 was accompanied by significant changes in the curing and final properties of the samples. It was shown that the physic- mechanical properties of polymer compositions ED-20 / ESO were determined by both the ESO content and the temperature of curing Depending on the selected curing mode, the addition of 5–10 wt.% of ESO increased the tensile strength relative to the σр value of the original epoxy matrix. The values of relative elongation increased significantly at 15-20 wt.% of ESO. By the method of dynamic mechanical analysis it was shown that the increase of ESO content leads to plasticization of epoxy composition and to reduction of crosslinking density. It was determined that 5-10 wt.% was the optimal concentration of ESO, at which the epoxy composition had improved physical and mechanical properties Further increase of ESO content reduced the crosslinking density and increased the defectiveness of the epoxy polymer, which causes premature failure in weak places of the structure under load.

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