Effects of hydrothermal aging on glass–fiber/polyetherimide (PEI) composites

Yılmaz, Taner; Sınmazçelik, Tamer

doi:10.1007/s10853-009-3954-1

Cited by 48 publications

(27 citation statements)

References 27 publications

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“…It was suggested that fiber–matrix debonding could provide additional diffusion paths to explain the extent of observed anisotropic oxidation growth. Yilmaz and Sinmazcelik [8] investigated the moisture absorption behavior and the influence of moisture on thermal and mechanical properties of glass–fiber/polyetherimide (PEI) laminates. The laminates were exposed to hydrothermal aging at two different temperatures and high moisture rates.…”

Section: Introductionmentioning

confidence: 99%

Effects of heat accelerated aging on tensile strength of three dimensional braided/epoxy resin composites

Song

2012

Polymer Composites

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The tensile tests of three‐dimensional (3Dim) and four‐directional (4Dir) carbon fiber braided/epoxy resin composites and carbon fiber woven plain fabric laminated/epoxy composites after heat accelerated aging at 150 and 180°C for 60, 120, and 180 h were carried out respectively. The reason of the changes of tensile property of these composites after different aging period of time at different high temperature was explained. The results of two‐way ANOVA analyzing indicate that the aging time has a significant effect on tensile strength of these composites. With the increase of accelerated aging period of time at high temperature, the tensile strengths of these composite samples decreased compared with that of composite samples without aging. However the decrease of tensile strength of 3Dim and 4Dir braided composites is less than that of laminated composites. One of the reasons is after aging for a long time at high temperature, the resin is damaged and becomes brittle which make the bonding force between fiber and resin decrease. Another reason is the structure of reinforcement of composites. After aging, the structure of 3Dim and 4Dir braided/epoxy resin composites still keeps the integrity which makes the 3Dim and 4Dir composites have less tensile performance degradation (3Dim and 4 Dir: three‐dimensional and four‐directional). POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Effects of heat accelerated aging on tensile strength of three dimensional braided/epoxy resin composites

Song

2012

Polymer Composites

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“…The entry of water molecules increases the degree of freedom of the polymer segment, thereby increasing the viscosity of the material. As for the wood powder reinforced polypropylene composites, the water molecules may cause the crack and debonding in the interface area due to the mismatch of the moisture expansion coefficients between wood powder and polypropylene, which would cause higher energy dissipation [36,39].…”

Section: Dynamic Mechanical Analysis Of the Compositesmentioning

confidence: 99%

Water Absorption and Hygrothermal Aging Behavior of Wood-Polypropylene Composites

et al. 2020

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Environmentally sound composites reinforced with natural fibers or particles interest many researchers and engineers due to their great potential to substitute the traditional composites reinforced with glass fibers. However, the sensitivity of natural fiber-reinforced composites to water has limited their applications. In this paper, wood powder-reinforced polypropylene composites (WPCs) with various wood content were prepared and subjected to water absorption tests to study the water absorption procedure and the effect of water absorbed in the specimens on the mechanical properties. Water soaking tests were carried out by immersion of composite specimens in a container of distilled water maintained at three different temperatures, 23, 60 and 80 °C. The results showed that the moisture absorption content was related to wood powder percentage and they had a positive relationship. The transfer process of water molecules in the sample was found to follow the Fickian model and the diffusion constant increased with elevated water temperature. In addition, tensile and bending tests of both dry and wet composite samples were conducted and the results indicated that water absorbed in composite specimens degraded their mechanical properties. The tensile strength and modulus of the composites reinforced with 15, 30, 45 wt % wood powder decreased by 5.79%, 17.2%, 32.06% and 25.31%, 33.6%, 47.3% respectively, compared with their corresponding dry specimens. The flexural strength and modulus of the composite samples exhibited a similar result. Furthermore, dynamic mechanical analysis (DMA) also confirmed that the detrimental effect of water molecules on the composite specimens.

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“…In many applications, structural elements made by GFRPs are routinely exposed to hot and humid environments . As a result, hydrothermal aging has become one of the most important mechanisms threatening the structural integrity of GFRP composites .…”

Section: Introductionmentioning

confidence: 99%

Improved hydrothermal aging performance of glass fiber‐reinforced polymer composites via silica nanoparticle coating

Zhang

2019

J of Applied Polymer Sci

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The long-term exposure to a hot and humid environment severely damages the bonding integrity of fiber-reinforced polymer composites and thus significantly degrades their mechanical performances. In this work, we aim to develop an improvement procedure for effectively enhancing the bonding strength in glass fiber-reinforced polymers (GFRPs). Glass fibers were coated with a thin layer of silica nanoparticles of different concentrations by the use of the evaporative deposition method. Micromorphological comparisons in terms of scanning electron microscope imaging demonstrate significant improvements on the surface roughness of glass fibers. With the coated glass fibers, GFRP composite laminates were designed, molded through the vacuum-assisted resin infusion technique, and experimentally tested for quantitatively studying their hydrothermal aging performance. The water absorption tests conducted for three exposure temperatures suggest that both the water diffusion rate and the equilibrium water content can be effectively reduced due to the introduction of the silica coating. With increased exposure temperatures, however, the desired reductions become much less significant. A so-called water-channel diffusion mechanism along fiber/resin interfaces was proposed to explain the coupling effects of silica coating and exposure temperature. Reductions of water diffusion rate and equilibrium water content were expected to slow down the hydrothermal aging performance of GFRPs. For this purpose, both uniaxial tensile test and three-point bending test were subsequently performed on GFRP specimens that have been subjected to different coating concentrations, exposure temperatures, and exposure durations. When compared with untreated GFRP specimens, both experiments demonstrate that the residual strength and stiffness can be effectively promoted through coating a thin layer of silica nanoparticles on glass fiber surfaces.

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Effects of hydrothermal aging on glass–fiber/polyetherimide (PEI) composites

Cited by 48 publications

References 27 publications

Effects of heat accelerated aging on tensile strength of three dimensional braided/epoxy resin composites

Effects of heat accelerated aging on tensile strength of three dimensional braided/epoxy resin composites

Water Absorption and Hygrothermal Aging Behavior of Wood-Polypropylene Composites

Improved hydrothermal aging performance of glass fiber‐reinforced polymer composites via silica nanoparticle coating

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