Green Composites: Introductory Overview

Choudhury, Mridusmita Roy; Debnath, Kishore

doi:10.1007/978-981-15-9643-8_1

Cited by 8 publications

(6 citation statements)

References 102 publications

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“…The growing importance of natural fiber reinforced composites is reflected by the increasing number of publications (e.g., reviews, patents, book chapters, and books) during the recent years [4,5,[20][21][22][23][24][25]. Therefore, it is important to study their thermal and mechanical behaviour in order to utilize their full potential.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Thermal Characterisation of Natural and Hybrid Fiber Composites

2021

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The thermal stability of natural fiber composites is a relevant aspect to be considered since the processing temperature plays a critical role in the manufacturing process of composites. At higher temperatures, the natural fiber components (cellulose, hemicellulose, and lignin) start to degrade and their major properties (mechanical and thermal) change. Different methods are used in the literature to determine the thermal properties of natural fiber composites as well as to help to understand and determine their suitability for a certain applications (e.g., Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and differential mechanical thermal analysis (DMA)). Weight loss percentage, the degradation temperature, glass transition temperature (Tg), and viscoelastic properties (storage modulus, loss modulus, and the damping factor) are the most common thermal properties determined by these methods. This paper provides an overview of the recent advances made regarding the thermal properties of natural and hybrid fiber composites in thermoset and thermoplastic polymeric matrices. First, the main factors that affect the thermal properties of natural and hybrid fiber composites (fiber and matrix type, the presence of fillers, fiber content and orientation, the treatment of the fibers, and manufacturing process) are briefly presented. Further, the methods used to determine the thermal properties of natural and hybrid composites are discussed. It is concluded that thermal analysis can provide useful information for the development of new materials and the optimization of the selection process of these materials for new applications. It is crucial to ensure that the natural fibers used in the composites can withstand the heat required during the fabrication process and retain their characteristics in service.

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Section: Introductionmentioning

confidence: 99%

A Review on the Thermal Characterisation of Natural and Hybrid Fiber Composites

2021

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“…This requirement of reducing plastic usage can be achieved by replacing conventional polymeric products with composite materials filled with various natural-organic fillers. Different naturally available fibers having primary constituents' lignin and cellulose, namely sisal, coconut (coir), jute, pineapple leaf, ramie, kenaf, abaca, banana, oil palm, flax, wheat straw, bamboo, and sun hemp, have emerged as promising organic reinforcements capable of replacing synthetic or traditional reinforcements materials in polymer composites [2,3]. These composites filled with nature-derived fibers represent a sustainable and environmentally friendly use of resources due to their renewable and biodegradable properties.…”

Section: Introductionmentioning

confidence: 99%

Optimizing drilling parameters for fly ash-filled hemp/epoxy composites: investigating drill bit geometries, feed rates, and spindle speeds

Roy Choudhury,

Dutta,

Srinivas

et al. 2024

Mater. Res. Express

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This article investigates the drilling behavior of hemp fiber-reinforced epoxy composites, both unfilled and fly ash-filled. Drilling performance tests were conducted at varying feed rates (8, 16, and 24 mm min−1) and spindle speeds (700, 1400, and 2100 RPM) using three drill geometries: parabolic, 8-facet, and dagger. The fly ash-filled hemp/epoxy composite showed significant reductions in maximum thrust force (25.09%, 19.92%, and 21.43%) and torque (80%, 79.87%, and 59.25%) when drilled with parabolic, 8-facet, and dagger drill bits, respectively, compared to the unfilled composite. The maximum drilling temperature reached 90.6 °C during cutting and decreased to 71.7 °C post-drilling. Overall, the fly ash-filled composites demonstrated superior performance in terms of drilling-induced stresses and damage.

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“…Natural fibres, particularly bast fibres such as flax, hemp, kenaf, ramie, and jute [1][2][3][4], have started to be used in recent years as the reinforcement in polymer-matrix composites. This is part of a wider thrust to use eco-friendly materials in lieu of their less environmentally-friendly counterparts.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Elementary Kenaf Fibres Extracted Using HNO3 and H2O2/CH3COOH

Soatthiyanon

Crosky

2022

Fibers

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In this study, elementary kenaf fibres were separated from fibre bundles using two different treatments. The first involved treating with nitric acid (HNO3) while the second used a mixture of hydrogen peroxide (H2O2) and acetic acid (CH3COOH). Both treatments were successful in isolating the elementary fibres but the H2O2/CH3COOH gave a better fibre yield and required a shorter treatment time. The fibres treated with HNO3 had an average length of 0.2 mm, an aspect ratio of 15 and a defect density of 21 defects per mm. In contrast, the H2O2/CH3COOH treated fibres had a length of 2.3 mm, an aspect ratio of 179 and a defect density of 14 defects per mm. Both treatments removed lignin, pectin, and waxes. They also increased cellulose crystallinity in the fibres, especially for HNO3 treatment. However, they resulted in some oxidation of cellulose. The H2O2/CH3COOH treatment gave a substantial improvement in the thermal stability of the fibres while a marked decrease was observed for the HNO3 treatment.

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Green Composites: Introductory Overview

Cited by 8 publications

References 102 publications

A Review on the Thermal Characterisation of Natural and Hybrid Fiber Composites

A Review on the Thermal Characterisation of Natural and Hybrid Fiber Composites

Optimizing drilling parameters for fly ash-filled hemp/epoxy composites: investigating drill bit geometries, feed rates, and spindle speeds

Characterisation of Elementary Kenaf Fibres Extracted Using HNO3 and H2O2/CH3COOH

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