Influence of moisture absorption on the flexural properties of composites made of epoxy resin reinforced with low-content iron particles

Sideridis, E.; Venetis, J.; Kyriazi, E.; Kytopoulos,

doi:10.1007/s12034-017-1419-8

Cited by 14 publications

(4 citation statements)

References 51 publications

(50 reference statements)

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“…Moreover, there were 41.65%, 37.67%, and 33.18% reduction in values of flexural strength, 11.54%, 7.34%, and 6.59% reduction in flexural modulus and 11.65%, 5.92%, and 3.25% reduction in elongation at break by water absorption for the composite SC, SC (T1), and SC (T2), respectively. Similar results of reduction in flexural properties of the composites by water absorption have been previously reported in the literature . Drop‐in value of flexural strength occurs at wet condition due to the formation of hydrogen bonding between the water molecules and fibers leading to higher water uptake, dimensional instability, and poor interfacial bonding between the fibers and matrix .…”

Section: Resultssupporting

confidence: 86%

Lowering in water absorption capacity and mechanical degradation of sisal/epoxy composite by sodium bicarbonate treatment and PLA coating

Sahu

Gupta

2019

Polymer Composites

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In view of environmental imbalance due to numerous use of manmade fibers and plastic products, demand of natural fibers reinforced biocomposites have been increased. The products prepare by these biocomposites have been used in the various applications. However, their utilizations are not found suitable in the applications where high strength and high water resistance are required. The prime aim of the present study is to improve the water resistance capacity and mechanical performance of aged sisal biocomposites. In this context, hand lay-up process was used to prepare the epoxy-based biocomposites by reinforcing the surface modified sisal fibers consisted of eco-friendly sodium bicarbonate treatment and poly (lactic acid) coating. The highest water absorption, thickness swelling, and sorption, diffusion and permeability coefficients of the fabricated sisal composites were studied. Moreover, the effect of water absorption on tensile, flexural, impact, and hardness properties of the sisal composites was also investigated. It was noticed that treated and coated sisal composite revealed the best water resistant behavior than all other the composites. This composite exhibited 30% lower water absorption capacity than that of pure sisal composite. Further, lowest degradation in mechanical properties, that is, tensile strength (3.59%), flexural strength (33.18%), and hardness (11.96%) was observed for treated and coated sisal composite. K E Y W O R D Scoating, eco-friendly treatment, mechanical properties, thickness swelling, water absorption behavior

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Section: Resultssupporting

confidence: 86%

Lowering in water absorption capacity and mechanical degradation of sisal/epoxy composite by sodium bicarbonate treatment and PLA coating

Sahu

Gupta

2019

Polymer Composites

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“…The moisture here acts as both a plasticizer, hydrolyzing, and crazing agent, which damages the structural and mechanical integrity of the matrix and also makes the material brittle, which can be confirmed from Figure 6, where the strain to failure is decreasing for both the composites with increasing HC. [ 55–57 ] The swelling of epoxy and thermal expansion due to variation in temperature and moisture also create residual stresses at the CNT/epoxy and fiber/epoxy interface. [ 58 ] In addition, hygroscopic stresses generated at these interfaces can be responsible for the severe decrement in flexural properties.…”

Section: Resultsmentioning

confidence: 99%

Effect of repeated hydrothermal cycling on the durability of glass fiber/epoxy composites with and without carbon nanotube reinforcement

et al. 2021

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Enhancing the performance of polymeric composites by incorporating carbon nanotube (CNT) is a current research trend. In this article, the performance of glass fiber reinforced epoxy (GE) composite with and without CNT has been observed under repeated hydrothermal cycling (HC) between 15 and 50°C water baths. Before carrying out the HC, the optimum concentration of CNT in the GE composite was obtained by flexural test. This study first confirms that the addition of 0.1 wt% of CNTs resulted in a 6.68% and 6.47% increment in flexural strength and modulus compared to neat GE composite. Alteration in the performance of the neat GE and 0.1 wt% CNT‐GE was then analyzed after performing HC for 20, 40, and 60 cycles by conducting mechanical (flexural), thermomechanical (dynamic mechanical thermal analysis [DMA]), chemical (Fourier transform infrared spectroscopy [FTIR]) and fractographic (scanning electron microscopy [SEM]) analysis. Degradation in the mechanical performance of the CNT embedded GE composite was found to be faster than the neat one with the increasing number of HC. The possible reason has been explained based on the evidence obtained from DMA, FTIR, and SEM analysis.

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“…The flexural strength of pure epoxy and ENNC is decreased by 23 and 14%, respectively, under sorption conditions. A small amount of water might have a significant impact on the flexural strength of a composite because water molecules migrate from one group to another [24]. The flexural strength of epoxy and ENNC is partially recovered under desorption conditions.…”

Section: Flexural Strengthmentioning

confidence: 99%

Water Sorption-Desorption-Resorption Effects on Mechanical Properties of Epoxy-Nanoclay Nanocomposites

Shettar

Kowshik

Gowrishnakar

et al. 2022

IJAME

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The present work aims to study the effect of water sorption–desorption–resorption conditions on the mechanical properties of epoxy-nanoclay nanocomposites (ENNCs). To prepare ENNCs specimens, nanoclay and epoxy are mixed together by a stirrer and a sonicator. The nanoclay-epoxy and hardener mixture are moulded into specimens that meet the dimensions prescribed by the ASTM standards. The specimens fabricated are subjected to three conditions viz., water sorption, desorption and resorption for a total of 140 days. Water sorption–desorption–resorption effects on the mechanical properties of pure epoxy and ENNCs are studied by tensile and flexural tests. Results showed that the nanoclay presence improved the mechanical properties and lowered the percentage of water uptake. Tensile and flexural strengths of epoxy and ENNCs are reduced under sorption conditions and recovered to more than 90% of their original strengths under desorption conditions. The lowest tensile and flexural strengths were displayed by specimens subjected to resorption in comparison to specimens subjected to the other two conditions. The flexural and tensile strengths of epoxy are more severely affected compared to ENNCs under water sorption–desorption–resorption conditions. Scanning electron microscopy images are employed to learn the causes of specimen failure under a tensile load.

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Influence of moisture absorption on the flexural properties of composites made of epoxy resin reinforced with low-content iron particles

Cited by 14 publications

References 51 publications

Lowering in water absorption capacity and mechanical degradation of sisal/epoxy composite by sodium bicarbonate treatment and PLA coating

Lowering in water absorption capacity and mechanical degradation of sisal/epoxy composite by sodium bicarbonate treatment and PLA coating

Effect of repeated hydrothermal cycling on the durability of glass fiber/epoxy composites with and without carbon nanotube reinforcement

Water Sorption-Desorption-Resorption Effects on Mechanical Properties of Epoxy-Nanoclay Nanocomposites

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