Effect of Hygrothermal Aging and Surface Treatment on the Dynamic Mechanical Behavior of Flax Fiber Reinforced Composites

Petrů, Michal

doi:10.3390/ma12152376

Cited by 22 publications

(22 citation statements)

References 38 publications

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“…As is widely known [40,50], the storage modulus is typically associated with the material stiffness: it measures the material's capability to store the energy applied. Two different regions of the storage modulus curve of fiber-reinforced polymers by varying temperature were evidenced, i.e., the first one below glass transition temperature (Tg) of the polymeric matrix and the second one above Tg, named glassy region and rubbery region, respectively.…”

Section: Effect Of Treatmentmentioning

confidence: 99%

“…In the glassy region, the storage modulus of fiber-reinforced composite materials was high because the components (i.e., matrix and reinforcement) were extremely immobilized, allowing a stiff behavior. Vice versa, FRP components acquired mobility, losing their close packing arrangement in the rubbery region, thus leading to decrease of the storage modulus with temperature [40].…”

Section: Effect Of Treatmentmentioning

confidence: 99%

“…This implies that preferential pathways for water diffusion can be identified in the interface between fibers and matrix, thus stimulating the triggering of premature water-induced degradation phenomena in the natural reinforced composite laminate. In particular, water weakens the physical bonds (i.e., van der Waals interaction) within the flax/matrix interface, as well as causing the hydrolysis of chemical bonds at the interface, thus leading to the occurrence of interfacial debonding phenomena [40]. As evidenced in Table 2, the temperature of both tan δ peaks decreased about 10 °C Furthermore, Figure 2a shows that, after salt-fog aging, the tan δ peaks of Flax-AR laminates (i.e., 1-month and 2-month aged samples) shifted to lower temperatures and became wider than the unaged sample.…”

Section: Effect Of Treatmentmentioning

confidence: 99%

“…Despite the wide literature about the quasi-static properties, research concerning the evolution of the dynamic mechanical behavior of NFRPs under such critical environmental conditions [36][37][38][39] and mainly how fiber surface treatments can help these materials to retain their damping properties [40,41] is still limited to date.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, this characterization can furnish the designer with important data about the effectiveness of fiber treatments. Within this context, the beneficial effect of surface treatments such as alkalization, silanization, acetylation and alkali-silanization on the dynamic mechanical behavior of flax fiber-reinforced polymers (FFRPs) under hydrothermal aging was shown by Wang and Petru [40]. The water resistance and damping properties of FFRPs were improved after all surface treatments, even if the acetylation treatment led the best damping performance among all treated composites.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Mechanical Behavior Analysis of Flax/Jute Fiber-Reinforced Composites under Salt-Fog Spray Environment

2020

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Over the last decades, natural fiber-reinforced polymer composites (NFRPs) gained great attention in several engineering fields thanks to the reduction of the environmental impact and the end-of-life cost disposal. Unfortunately, the use of NFRPs is limited, mainly due to their weak resistance against humid environments. Since limited literature is available about the evolution of the dynamic mechanical response of NFRPs under aggressive environments, this paper aims to investigate the damping properties of flax, jute and flax/jute epoxy composites exposed to salt-fog up to 60 days. Furthermore, sodium bicarbonate fiber treatment was performed to improve the composites’ durability. The effectiveness of treatment was evidenced for full flax-reinforced composites, whereas no beneficial effect was found for jute composites. Moreover, treated hybrid laminates having outer laminae reinforced with flax showed better damping behavior than their hybrid counterparts during the whole aging campaign.

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Section: Effect Of Treatmentmentioning

confidence: 99%

Section: Effect Of Treatmentmentioning

confidence: 99%

Section: Effect Of Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic Mechanical Behavior Analysis of Flax/Jute Fiber-Reinforced Composites under Salt-Fog Spray Environment

2020

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Investigation of the effect of water absorption on thermomechanical and viscoelastic properties of flax‐hemp‐reinforced hybrid composite

Saha

Kumar

Zindani³

2021

Polymer Composites

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The recent development of natural fiber-reinforced polymer composites have shown innumerable economic and environmental benefits for a vast array of engineering applications. It is quintessential to investigate the effect of water absorption on the composites that remain in the water for a maximum of their intended service period. This study is an effort in this direction that investigates the effect of water absorption on thermo-mechanical properties of flaxhemp-reinforced epoxy composites fabricated using compression hand layup technique with different weight fraction of fiber. The fabricated composites have been characterized physically (density and water absorption), thermomechanically (tensile, flexural, thermal conductivity, and dynamical mechanical analysis), and morphologically (scanning electron microscopy [SEM]). The analysis revealed that hemp-reinforced composites (S1) had the highest water absorption capabilities in comparison to the flax-reinforced composites (S5).Higher water absorption capability had an adverse effect on the mechanical properties of fabricated composites. However, hybrid composites (S2, S3, and S4) reported better performance with regard to S1. The increased water content, however, increased the thermal conductivity of composites and maximum has been revealed for S1 (0.82 W/mK) and minimum for S5 (0.48 W/mK). The water molecules showed detrimental effects on the viscoelastic properties and revealed S3 have better interlocking bond with the lowest reduction in storage modulus (12%) and glass transition temperature (4 C) in comparison to S1 (30%) under wet conditions. A comparative analysis of the thermo-mechanical properties was also made for developed composites under dry, saturated, and re-dried conditions. The SEM has been used to characterize the morphological and fracture behavior of the fabricated composites under the influence of water uptake. The effects of water molecules on the hygrothermal aging index and diffusion co-efficient have also been discussed. Overall, the hybridization of

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Mechanical, thermogravimetric, and dynamic mechanical analysis of basalt and flax fibers intertwined vinyl ester polymer composites

Selvaraj¹,

Rajkumar²,

Ramraji³

2022

Polymer Composites

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The selection of fibers and their stacking sequence, which affect structural integrity and functional properties, are critical parts of polymer composite design. In this work, the influence of various stacking sequences made of basalt and flax fiber layers on the mechanical, thermal, and dynamic mechanical analyses of vinyl ester polymer composites was investigated. The stacking sequence designed by alternate basalt and flax layers showed higher tensile and flexural strengths, with basalt layers in the outer positions. The high‐strength basalt fiber retains considerable stress, particularly in the outer layer, reducing stress transfer to the remaining core layers. The basalt and flax fiber alternative layered sequence with outer basalt layers shows a slightly lower thermal degradation temperature (467°C) than the only basalt layered sequence composite (474°C). Because of the high thermal resistance of the outer basalt layers, heat flow to the next fiber layers is reduced. The dynamic mechanical analysis reveals that the polymer composite intertwined with only basalt fiber was found to have a higher storage modulus. On the other hand, the outer basalt layers intertwined with the core flax layers composite showed a 122% higher damping value than the stacking sequence made of only basalt fiber due to the porous structure of flax fibers dissipating more vibration energy.

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Effect of Hygrothermal Aging and Surface Treatment on the Dynamic Mechanical Behavior of Flax Fiber Reinforced Composites

Cited by 22 publications

References 38 publications

Dynamic Mechanical Behavior Analysis of Flax/Jute Fiber-Reinforced Composites under Salt-Fog Spray Environment

Dynamic Mechanical Behavior Analysis of Flax/Jute Fiber-Reinforced Composites under Salt-Fog Spray Environment

Investigation of the effect of water absorption on thermomechanical and viscoelastic properties of flax‐hemp‐reinforced hybrid composite

Mechanical, thermogravimetric, and dynamic mechanical analysis of basalt and flax fibers intertwined vinyl ester polymer composites

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