Investigation on mechanical properties of polyurethane hybrid nanocomposite foams reinforced with roselle fibers and silica nanoparticles
12 Feb 2019-Vol. 5, Iss: 1, pp 1-12
TL;DR: In this paper, the authors determined the mechanical, morphological and thermal properties of spherical silica, amorphous silica and Roselle fiber reinforced polymeric polysilica.
Abstract: The aim of this research work is to determine the mechanical, morphological and thermal properties of spherical silica (silica-A), amorphous silica (silica-B) and Roselle fiber (RF) reinforced poly...
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TL;DR: The present review article intends to provide a general overview of selecting the materials to manufacture hybrid biocomposite systems with improved strength properties, water, and burning resistance in recent years.
Abstract: Bio-based composites are reinforced polymeric materials in which one of the matrix and reinforcement components or both are from bio-based origins. The biocomposite industry has recently drawn great attention for diverse applications, from household articles to automobiles. This is owing to their low cost, biodegradability, being lightweight, availability, and environmental concerns over synthetic and nonrenewable materials derived from limited resources like fossil fuel. The focus has slowly shifted from traditional biocomposite systems, including thermoplastic polymers reinforced with natural fibers, to more advanced systems called hybrid biocomposites. Hybridization of bio-based fibers/matrices and synthetic ones offers a new strategy to overcome the shortcomings of purely natural fibers or matrices. By incorporating two or more reinforcement types into a single composite, it is possible to not only maintain the advantages of both types but also alleviate some disadvantages of one type of reinforcement by another one. This approach leads to improvement of the mechanical and physical properties of biocomposites for extensive applications. The present review article intends to provide a general overview of selecting the materials to manufacture hybrid biocomposite systems with improved strength properties, water, and burning resistance in recent years.
38 citations
TL;DR: In this paper, the natural fibers of banana and coir from southern part of India were used as reinforcement material and taguchi-based grey relational analysis was used for optimizing the factors influencing ten factors.
Abstract: The natural fibers of banana and coir from southern part of India was taken as the reinforcement material. Taguchi-based grey relational analysis was used for optimizing the factors influencing ten...
32 citations
TL;DR: In this paper, the authors investigated the effect of natural fiber-reinforced hybrid composites on the performance of hybrid composite composites and found that natural fiber composites find wide applications in recent decades owing to its biodegradability, low density, and low-cost benefits.
Abstract: Natural fiber-reinforced hybrid composites find wide applications in recent decades owing to its biodegradability, low density, and low-cost benefits. The work reported investigates, the ef...
28 citations
Cites background from "Investigation on mechanical propert..."
...…nano-silica particles into polymer matrix composites, that enhance the thermal and mechanical properties like yield strength, hardness, tensile strength, elastic modulus, thermal stability and toughness of composites were reported by researchers (Hapuarachchi and Peijs 2010; Soundhar et al. 2019)....
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...filler materials such as Carbon Nanotubes (CNTs), Multi-Walled Carbon Nanotubes (MWCNTs) and nano-silica particles into polymer matrix composites, that enhance the thermal and mechanical properties like yield strength, hardness, tensile strength, elastic modulus, thermal stability and toughness of composites were reported by researchers (Hapuarachchi and Peijs 2010; Soundhar et al. 2019)....
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TL;DR: In this paper, sisal and coir fiber-based epoxy composites were fabricated using compression molding route and multi-response optimization using GRA showed significance of both the fibers in enhancing mechanical properties.
Abstract: In this study, sisal and coir fiber-based epoxy composites were fabricated using compression molding route. Optimization technique using Taguchi and grey relational analysis (GRA) was employed to find the best condition for tensile, flexural and impact properties. Sisal (0–20 wt%), coir fibers (0–20 wt%), NaOH treatment (0–8 wt%), compression pressure (10–16 MPa) and temperature (100–120 °C) are the different factors with various levels. Multi-response optimization using GRA showed significance of both the fibers in enhancing mechanical properties. The response table of GRA concluded that combination of sisal 20%/coir 15%/NaOH treatment 5%/compression pressure 10 MPa and temperature 120 °C has the best mechanical results. SEM images indicated the advancement in adhesion of reinforcement and epoxy resin by hybridization of fibers. The artificial neural network (ANN) prediction states predicted and experimental values for various trials are almost same, and regression graph showed a straight line with R-value 97.321%. These fabricated composites can be used in aerospace and automobile industries for their interior parts.
24 citations
01 Nov 2019
TL;DR: In this article, a novel approach has been used for the efficient synthesis of tetrahydrodipyrazolopyridine derivatives (5a-m) via a four-component one-pot condensation reaction of aromatic aldehydes.
Abstract: In this study, a novel approach has been used for the efficient synthesis of tetrahydrodipyrazolopyridine derivatives (5a–m) via a four-component one-pot condensation reaction of aromatic aldehydes...
15 citations
Cites background from "Investigation on mechanical propert..."
...Recently, surface functionalized mesoporous systems have appeared as one of the most significant research areas in the concerning of advanced functional materials [28,31,32]....
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References
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Abstract: Recently, there has been a rapid growth in research and innovation in the natural fibre composite (NFC) area. Interest is warranted due to the advantages of these materials compared to others, such as synthetic fibre composites, including low environmental impact and low cost and support their potential across a wide range of applications. Much effort has gone into increasing their mechanical performance to extend the capabilities and applications of this group of materials. This review aims to provide an overview of the factors that affect the mechanical performance of NFCs and details achievements made with them.
2,182 citations
TL;DR: A comprehensive review of polymer nanocomposite research can be found in this paper, including fundamental structure/property relationships, manufacturing techniques, and applications of polymer nano-composite materials.
Abstract: This review is designed to be a comprehensive source for polymer nanocomposite research, including fundamental structure/property relationships, manufacturing techniques, and applications of polymer nanocomposite materials. In addition to presenting the scientific framework for the advances in polymer nanocomposite research, this review focuses on the scientific principles and mechanisms in relation to the methods of processing and manufacturing with a discussion on commercial applications and health/safety concerns (a critical issue for production and scale-up). Hence, this review offers a comprehensive discussion on technology, modeling, characterization, processing, manufacturing, applications, and health/safety concerns for polymer nanocomposites.
1,976 citations
TL;DR: In this paper, the authors review select comparative life cycle assessment studies of natural fiber and glass fiber composites, and identify key drivers of their relative environmental performance, and conclude that natural fiber composite is likely to be environmentally superior to glass fiber composite in most cases.
Abstract: Natural fibers are emerging as low cost, lightweight and apparently environmentally superior alternatives to glass fibers in composites. We review select comparative life cycle assessment studies of natural fiber and glass fiber composites, and identify key drivers of their relative environmental performance. Natural fiber composites are likely to be environmentally superior to glass fiber composites in most cases for the following reasons: (1) natural fiber production has lower environmental impacts compared to glass fiber production; (2) natural fiber composites have higher fiber content for equivalent performance, reducing more polluting base polymer content; (3) the light-weight natural fiber composites improve fuel efficiency and reduce emissions in the use phase of the component, especially in auto applications; and (4) end of life incineration of natural fibers results in recovered energy and carbon credits.
1,836 citations
TL;DR: In the past decade, natural fiber composites with thermoplastic and thermoset matrices have been embraced by European car manufacturers and suppliers for door panels, seat backs, headliners, package trays, dashboards, and interior parts as mentioned in this paper.
Abstract: In the past decade, natural-fiber composites with thermoplastic and thermoset matrices have been embraced by European car manufacturers and suppliers for door panels, seat backs, headliners, package trays, dashboards, and interior parts. Natural fibers such as kenaf, hemp, flax, jute, and sisal offer such benefits as reductions in weight, cost, and CO2, less reliance on foreign oil sources, and recyclability. However, several major technical considerations must be addressed before the engineering, scientific, and commercial communities gain the confidence to enable wide-scale acceptance, particularly in exterior parts where a Class A surface finish is required. Challenges include the homogenization of the fiber's properties and a full understanding of the degree of polymerization and crystallization, adhesion between the fiber and matrix, moisture repellence, and flame-retardant properties, to name but a few.
1,272 citations
TL;DR: This work shows that freeze-casting suspensions of cellulose nanofibres, graphene oxide and sepiolite nanorods produces super-insulating, fire-retardant and strong anisotropic foams that perform better than traditional polymer-based insulating materials.
Abstract: High-performance thermally insulating materials from renewable resources are needed to improve the energy efficiency of buildings. Traditional fossil-fuel-derived insulation materials such as expan ...
1,009 citations