Epoxy composites for aviation industry

Oliwa, Rafał; Heneczkowski, Maciej; Oleksy, Mariusz

doi:10.14314/polimery.2015.167

Cited by 10 publications

(10 citation statements)

References 36 publications

(40 reference statements)

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“…This paper is an extension of the research conducted so far in the Department of Polymeric Composites on obtaining compositions of epoxy resin with the addition of modified bentonite [11]. The aim of this work was to investigate the effect of bentonites modified with quaternary phosphonium and ammonium salts with different cation structure on the gelation properties of epoxy compositions.…”

Section: Wpływ Modyfikowanych Bentonitów Na Proces Sieciowania żYwicymentioning

confidence: 99%

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Effect of modified bentonites on the crosslinking process of epoxy resin with alifphatic amine as curing agent

Oliwa

Bulanda

et al. 2019

Polimery

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In this work the influence of modified bentonites on the process of epoxy crosslinking with triethylenetetramine (TETA) was investigated. Bentonites (BS) modified with quaternary phosphonium (QPS) and ammonium (QAS) salts were used as a nanofiller in the epoxy matrix (EP) in the amounts of 1 and 3 wt %. Gel time of the compositions was investigated using rotational rheometer at 30, 45 and 60 °C and activation energies of the compositions were determined. The storage G' and loss G" moduli crossover criterion was used to determine the nanocomposites gel time variation. On the basis of the obtained results, it was found that the addition of modified aluminosilicates decreased the gel time of epoxy compositions at 30 and 45 °C, while at 60 °C it increased compared to unmodified epoxy resin. The obtained results indicate that the amount of modified aluminosilicate and the type of salt influence the reactivity of epoxy compositions. Among the tested systems, the most reactive was the composition of EP+3%BSQPS1, because the gel time at 30 °C and activation energy decreased by 1500 s and 8 J/mol, respectively, in relation to the unfilled EP resin. A more catalytic effect was observed in the case of bentonites modified with quaternary phosphonium salts, which may be associated with lower phosphorus electronegativity in relation to nitrogen and a lower viscosity of these systems.

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Section: Wpływ Modyfikowanych Bentonitów Na Proces Sieciowania żYwicymentioning

confidence: 99%

“…Compositions of epoxy resin containing 0.0, 1.0 or 3.0 wt % bentonite Specjal modified QAS or QPS have been prepared using four step homogenization procedure [11]. In order to prevent the mixture aging, it was kept at temp.…”

Section: Preparation Of Epoxy Compositionsmentioning

confidence: 99%

Effect of modified bentonites on the crosslinking process of epoxy resin with alifphatic amine as curing agent

Oliwa

Bulanda

et al. 2019

Polimery

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“…The procedure of modifying layered silicates with quaternary ammonium and phosphonium salts had been previously patented [ 33 , 34 ] and described in detail in a previous paper [ 32 ]. The procedure consists of introducing 30–40% aqueous solution of quaternary ammonium and phosphonium salts to a 10% suspension of bentonite in water heated to 60–90 °C, vigorous mixing for 1–3 h, removal of the supernatant liquid, and drying, grinding, and sieving to obtain modified bentonites of grain size below 63 µm.…”

Section: Experimental Partmentioning

confidence: 99%

“…Epoxy compositions containing 1 and 3 wt.% modified bentonites were obtained. The modified bentonite was dispersed in the epoxy matrix using a four-step homogenization procedure [ 32 ], consisting of: premixing at room temperature by using a slow-running mechanical stirrer at velocity of 1500 rpm for 10 min, ultrasonic application at 50 °C for 10 min, mixing (at 50 °C, for 20 min) in a high-speed mixer (Dispermat CN40 produced by VMA-Getzmann, Gmbh, Reichshof, Germany) equipped with a turbine-like mixing blade, and final homogenization for 10 min in a high-speed shear rotating grinder at the rate of ca. 1000 s −1 .…”

Section: Experimental Partmentioning

confidence: 99%

“…However, there is still a lack of information regarding the influence of nanoclay on the mechanical properties, such as the tensile strength, flexural strength, and shear strength, of aramid fiber reinforced composites. In our previous study, we observed an enhancement of the mechanical and thermal properties in epoxy composites [ 31 ] and unidirectional glass fabric reinforced epoxy composites [ 32 ]. The objective of the present paper was to use modified bentonites in aramid fibre reinforced composite technology, to extend their application as structural materials, by improving the stiffness and mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

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The Mechanical Properties of Kevlar Fabric/Epoxy Composites Containing Aluminosilicates Modified with Quaternary Ammonium and Phosphonium Salts

Oliwa

2020

Materials

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We investigated the effect of modified aluminosilicates, including bentonite from Armenia (BA) modified with quaternary ammonium salts (BAQAS) and phosphonium salts (BAQPS), on the mechanical properties and morphology of Kevlar/epoxy composites. The Kevlar/epoxy composites containing 1.0 or 3.0 wt.% modified bentonites were fabricated using the hand lay-up technique. The mechanical properties, including the tensile, flexural, and in-plane shear strength, were tested. Based on the obtained results, we found that the mechanical properties increased with modified bentonite loading. The best results were obtained for composites containing 3 wt.% BAQAS, as most of the mechanical properties were significantly improved (tensile strength 302.9 MPa (+30%), Young’s modulus 16.3 GPa (+17%), flexural modulus 23.4 GPa (+12.5%), in-plane shear strength 22.8 MPa (+24.5%), and in-plane shear modulus 677.2 MPa (+42%)). The obtained improvements in the mechanical properties are attributed to the uniform dispersion of the filler, which was confirmed by the highest increase in the intergallery spacing, from 28.3 Å for BAQAS to 45.1 Å for the composite with 3 wt.% BAQAS. Scanning electron microscopy (SEM) analysis of the brittle fracture surface indicated that the addition of modified bentonite to the epoxy matrix changed the morphology of the Kevlar/epoxy/organoclay composites and improved the fiber–matrix interfacial adhesion.

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