Development and Research of Thermal Insulation Materials from Natural Fibres

Vaitkus, Saulius; Karpavičiūtė, Rūta; Vėjelis, Sigitas; Lekūnaitė, Lina

doi:10.4028/www.scientific.net/kem.604.285

Cited by 23 publications

(10 citation statements)

References 8 publications

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“…This is because hemp fiber has a greater crystalline index compared to flax fiber. 31,55 From the results of the thermal conductivity test under wet conditions, it could be observed that as the immersion time of the composite in water is increased, the thermal conductivity also increased. The thermal conductivity of all the composite samples increased rapidly with a rapid increment of water absorption and as the water absorption became saturated, the increment in thermal conductivity also got saturated.…”

Section: Thermal Conductivity Resultsmentioning

confidence: 99%

“…Among all fiber‐loaded composite samples, the hemp fiber‐reinforced composite (S1) showed the highest thermal conductivity of 0.251 W/mK while flax fiber‐reinforced composite (S5) showed the lowest thermal conductivity with the value of 0.199 W/mk. This is because hemp fiber has a greater crystalline index compared to flax fiber 31,55 …”

Section: Resultsmentioning

confidence: 99%

“…Hemp fiber has a better crystallinity index that results in better insulating properties and thermal conductivity. 30,31 Flax fiber has been selected because of its superior mechanical properties and water absorption capacity that allows for higher energy absorption capacity. 32,33 Hemp fiber has been sourced from Vruksha Composites & Services, Andhra Pradesh, India.…”

Section: Methodsmentioning

confidence: 99%

“…Hemp fiber and Flax fiber have been selected as reinforcing materials. Hemp fiber has a better crystallinity index that results in better insulating properties and thermal conductivity 30,31 . Flax fiber has been selected because of its superior mechanical properties and water absorption capacity that allows for higher energy absorption capacity 32,33 .…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Thermal Conductivity Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

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 years, the application and research of natural-based and reused/recycled thermal insulation materials are growing. The most common natural raw materials for thermal insulation are flax, hemp, sheep wool, corn husk, cotton, coconut husk [8][9][10][11]. Some sustainable insulation reaches the thermal insulation performance [12], durability, usability, or mechanical properties of artificial insulations, but these properties usually not combined in one product [13].…”

Section: Research Motivationmentioning

confidence: 99%

Effect of drying method on compressive strength of straw-based thermal insulations

Fenyvesi¹,

Csanády²

2021

MST

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Most of the thermal insulations in the construction industry market based on fossil raw material or need a huge amount of production energy. Nowadays, sustainable thermal insulation products are more popular, and the demand for these products on the market is increasing. Some of them reach the main material properties of artificial ones but usually not all. Today the reaction to fire is another big challenge in this field. In many cases, producers use chemicals that can increase fire resistance, but on the other hand, increase the environmental impact of insulations too. It is also hard to find a binder which provides proper mechanical parameters and durability and is environmentally friendly too. During our scientific research on environmentally friendly thermal insulation materials, which is running for 4 years, we found that silicate-based adhesives meet many of these criteria mentioned above. In this article, the mechanical properties of straw-based insulation bonded with silicate binder were investigated. The effect of conventional and microwave drying on compressive strength were compared to found the optimal hardening process of binders. During the experiments, straw was applied in a natural state, natural stem length distribution and without microstructure and surface modification. The used binder is a simple silicate-based binder (potassium silicate) without any modification agent. Conventional drying needs a longer time, and during it, many cracks form in the early age of the hardened binder. It is because of shrinkage and the differences in the rigidity of the binder along its cross-section. Besides, the straw stems swell when exposed to moisture (from binder), and after drying they shrink, which decreases the quality of the bond between stems and binder. The microwave drying evenly heats the various points of the specimen, so it is not generated such big differences in shrinkage. The contact between stems and binder are also better. Due to these effects, the microwave dried specimens reached the limit required for step resistance, and they had three-time higher average compressive strength than we got by the conventional drying of the same raw material.

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Assessing Hygrothermal Parameters of Plant-Based Building Materials for Simulation: A Mini Review

et al. 2023

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Development and Research of Thermal Insulation Materials from Natural Fibres

Cited by 23 publications

References 8 publications

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

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

Effect of drying method on compressive strength of straw-based thermal insulations

Assessing Hygrothermal Parameters of Plant-Based Building Materials for Simulation: A Mini Review

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