Assessment of Chemical Treatment on Hemp Fiber Utilized as Reinforcement in Polymer Composites: Association of Thermal Degradation and Activation Energy of Fiber

Soni, Priyanka; Sinha, Shishir

doi:10.1080/15440478.2022.2121353

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…Natural fiber polymer composites are being utilized in various industries, including automotive, electronics, construction, aerospace, and consumer goods 3,4 . They can be utilized in interior components, structural elements, electrical insulation, and protective clothing.…”

Section: Introductionmentioning

confidence: 99%

“…2 Natural fiber polymer composites are being utilized in various industries, including automotive, electronics, construction, aerospace, and consumer goods. 3,4 They can be utilized in interior components, structural elements, electrical insulation, and protective clothing. However, the utilization of natural fibers as reinforcement in polymer composites does have some disadvantages, including poor compatibility with polymer matrices and low thermal stability.…”

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Fiber and future: Unleashing the power of industrial hemp waste through epoxy composites

Soni,

Sinha

2023

Polymer Composites

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Natural fiber composites offer a sustainable alternative to synthetic polymer composites, addressing the environmental concerns associated with traditional materials. This study aims to investigate the effect of flame‐retardant additives (magnesium hydroxide Mg(OH)2 [A] and aluminum hydroxide Al(OH)3 [B]) on hemp fiber‐based epoxy composites with a different fire retardant (FR) loading, that is, 0%, 8%, 12%, and 24%. An evaluation of flame‐retardant effectiveness on composites was carried out using thermogravimetric analysis, limited oxygen index (LOI), UL‐94 horizontal burning, morphological analysis scanning electron microscopy (SEM), and char residue analysis. The results show that introducing the flame retardants in the hemp–epoxy composites improved the thermal stability and flame retardancy of hemp–epoxy composites When composites were incorporated with flame retardants, the Horizontal burning rate was decreased, and LOI was increased. The lowest Horizontal burning rate of prepared composites was recorded as 11.6 mm/min, and the highest LOI was 25.3%. SEM shows uniform distribution of FR particles in the prepared composite. It is concluded that adding flame‐retardant additives efficiently improves the flame retardancy properties of the prepared composites.Highlights The mechanical and flammability behavior of developed composites were investigated after adding magnesium hydroxide and aluminum hydroxide to composites. An enhancement in flame retardancy and a slight reduction in mechanical properties are observed in composites. The purpose of this study is to expand the area where flame‐retardant ramie fabrics may be applied.

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Section: Introductionmentioning

confidence: 99%

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Fiber and future: Unleashing the power of industrial hemp waste through epoxy composites

Soni,

Sinha

2023

Polymer Composites

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Hybrid hemp/glass fiber reinforced high-temperature shape memory photopolymer with mechanical and flame-retardant analysis

Mahmud,

Konlan,

Deicaza

et al. 2023

Sci Rep

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Cultivated natural fibers have a huge possibility for green and sustainable reinforcement for polymers, but their limited load-bearing ability and flammability prevent them from wide applications in composites. According to the beam theory, normal stress is the maximum at the outermost layers but zero at the mid-plane under bending (with (non)linear strain distribution). Shear stress is the maximum at the mid-plane but manageable for most polymers. Accordingly, a laminated composite made of hybrid fiber-reinforced shape memory photopolymer was developed, incorporating strong synthetic glass fibers over a weak core of natural hemp fibers. Even with a significant proportion of natural hemp fibers, the mechanical properties of the hybrid composites were close to those reinforced solely with glass fibers. The composites exhibited good shape memory properties, with at least 52% shape fixity ratio and 71% shape recovery ratio, and 24 MPa recovery stress. After 40 s burning, a hybrid composite still maintained 83.53% of its load carrying capacity. Therefore, in addition to largely maintaining the load carrying capacity through the hybrid reinforcement design, the use of shape memory photopolymer endowed a couple of new functionalities to the composites: the plastically deformed laminated composite beam can largely return to its original shape due to the shape memory effect of the polymer matrix, and the flame retardancy of the polymer matrix makes the flammable hemp fiber survive the fire hazard. The findings of this study present exciting prospects for utilizing low-strength and flammable natural fibers in multifunctional load-bearing composites that possess both flame retardancy and shape memory properties.

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Advancements in chemical modifications using NaOH to explore the chemical, mechanical and thermal properties of natural fiber polymer composites (NFPC)

Mani,

Selvaraj,

Sivanantham

et al. 2024

International Polymer Processing

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Increasing environmental awareness and concerns about global warming have resulted in a significant demand for sustainable and eco-friendly resources, such as naturally available fibers, that can be suitable alternatives to petroleum/synthetic materials such as glass, carbon and Kevlar in reinforced composites. The exploration of natural fibers as reinforcements in composites is increasing in popularity, particularly in the development of transport and household components. However, natural fibers also have a few limitations that should be addressed appropriately, including lack of compatibility between fiber-matrix, fiber swelling, excess absorption of moisture, resistance to chemicals and fire. Consequently, various processes have been used to improve the fiber surface, to obtain a better fiber–matrix interface. The primary objective of this work is to review the impact that a 5 % NaOH (sodium hydroxide) treatment has on the chemical, mechanical, and thermal properties of natural fiber-reinforced composites (NFRC).

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Assessment of Chemical Treatment on Hemp Fiber Utilized as Reinforcement in Polymer Composites: Association of Thermal Degradation and Activation Energy of Fiber

Cited by 3 publications

References 28 publications

Fiber and future: Unleashing the power of industrial hemp waste through epoxy composites

Fiber and future: Unleashing the power of industrial hemp waste through epoxy composites

Hybrid hemp/glass fiber reinforced high-temperature shape memory photopolymer with mechanical and flame-retardant analysis

Advancements in chemical modifications using NaOH to explore the chemical, mechanical and thermal properties of natural fiber polymer composites (NFPC)

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