Special Issue "Polymeric Composites Reinforced with Nanoparticles"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (24 February 2020).

Special Issue Editor

Dr. Ana Paula Betencourt Martins Amaro
E-Mail Website
Guest Editor
Department of Mechanical Engineering, University of Coimbra, 3004-531 Coimbra, Portugal
Interests: composites; nanocomposites; finite elements; nondestructive techniques; mechanical testing; biomechanics
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Special Issue Information

Dear Colleagues,

During the last few years, polymer matrix composites have become one of the most interesting research fields due to their good specific properties. These materials are extensively used as metal substitutes in several applications, such as aircraft, automotive, aerospace, shipbuilding, civil construction, electronic devices, textiles, machinery, and inclusively under hard working conditions, due to their unique combination of properties. However, the polymeric matrix is the constituent with lower strength, and this disadvantage can be overcome with the inclusion of nanoparticles. The inclusion of a small percentage of nanoparticles, such as TiO2, Al2O3, ZnO, Ag, clay, CNTs, etc., in polymer matrices significantly increases the mechanical, thermal, and physical properties compared to pure resin. However, the agglomeration of nanoparticles during nanocomposites manufacture can decrease their mechanical properties. The formation of particle agglomerates during their inclusion into a polymeric matrix and their non-uniform dispersion have motivated research to find the best techniques, or to develop the existing ones, to avoid these problems. The curing agents used during nanocomposites manufacture can also have a significant influence on their mechanical properties and on their final cost.

In this context, this Special Issue intends to increase the state-of-the-art related with nano-enhanced resins and their manufacture processes. For this purpose, experimental and numerical studies are welcome.

It is my pleasure to invite you to publish your original research contributions and reviews in the Special Issue, ‘Polymeric Composite Reinforced with nanoparticles’, of Applied Sciences.

Dr. Ana Paula Betencourt Martins Amaro
Guest Editor

Manuscript Submission Information

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Keywords

  • curing agents
  • mechanical testing
  • mechanical properties
  • nanocomposites
  • nanoparticles
  • nondestructive techniques
  • polymer-matrix composites (PMCs)
  • numerical evaluation.

Published Papers (4 papers)

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Research

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Article
Experimental Study on the Surface Properties of Nanoalumina-Filled Epoxy Resin Nanocomposites
Appl. Sci. 2020, 10(3), 733; https://doi.org/10.3390/app10030733 - 21 Jan 2020
Cited by 5 | Viewed by 741
Abstract
This article presents an experimental study on the surface properties of epoxy resin nanocomposites (EPNCs) manufactured with a thermosetting epoxy resin (EP)–bisphenol A diglycidyl ether (BADGE)–2-[[4-[2-[4-(Oxiran-2-ylmethoxy)phenyl]propan-2-yl]phenoxy]methyl]oxirane) and filled with alumina nanoparticles (NPs). The NPs consist of pretreated (with a silane agent) alpha alumina [...] Read more.
This article presents an experimental study on the surface properties of epoxy resin nanocomposites (EPNCs) manufactured with a thermosetting epoxy resin (EP)–bisphenol A diglycidyl ether (BADGE)–2-[[4-[2-[4-(Oxiran-2-ylmethoxy)phenyl]propan-2-yl]phenoxy]methyl]oxirane) and filled with alumina nanoparticles (NPs). The NPs consist of pretreated (with a silane agent) alpha alumina with irregular shapes and a 100 nm maximum size. Three weight fractions of NPs were studied: 1, 3, and 5 wt. (%). Two different epoxy (EP) resins were manufactured, one cured and postcured with bis (4-aminophenyl) methane (DDM); and another one cured with 3-dodec-2-enyloxolane-2,5-dione (DDSA) + 8-methyl-3a,4,7,7a-tetrahydro-4,7-methano-2-benzofuran-1,3-dione (MNA). The wettability and the surface roughness of the obtained EPNCs were studied through the measurement of contact angles and topographic images obtained with atomic force microscopy (AFM), respectively. Significant influence of both the loading of NPs and used curing agents was observed. EPNCs cured with DDM were shown to be hydrophobic for 0, 1, and 3 wt. (%) and hydrophilic for 5 wt. (%). Maximum surface roughness was observed for 5 wt. (%). EPNCs cured with DDSA+MNA were shown to be hydrophilic for 0 and 1 wt. (%) and hydrophobic for 3 and 5 wt. (%). The surface roughness decreased as the weight fraction of NPs increased until 3 wt. (%), and then increased for 5 wt. (%). Full article
(This article belongs to the Special Issue Polymeric Composites Reinforced with Nanoparticles)
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Article
Fire Properties of Acrylonitrile Butadiene Styrene Enhanced with Organic Montmorillonite and Exolit Fire Retardant
Appl. Sci. 2019, 9(24), 5433; https://doi.org/10.3390/app9245433 - 11 Dec 2019
Cited by 1 | Viewed by 1017
Abstract
In this paper an experimental investigation on fire retardancy of a new polymer nanocomposite derived from organic montmorillonite and exolit fire retardant in an acrylonitrile- butadiene-styrene copolymer by analyzing the flammability and fire behavior is described. The samples were prepared by melting and [...] Read more.
In this paper an experimental investigation on fire retardancy of a new polymer nanocomposite derived from organic montmorillonite and exolit fire retardant in an acrylonitrile- butadiene-styrene copolymer by analyzing the flammability and fire behavior is described. The samples were prepared by melting and mixing nanocomposites and fire retardant in different concentrations in an acrylonitrile-butadiene-styrene base polymer. It was found that using only one component (organic montmorillonite or fire retardant) the burning stops in 10 s on the sample. Confirmation of synergy in flammability by combining both montmorillonite and flame retardants was noticed and is discussed regarding the flame-retardant mechanisms assessed by means of the Limiting oxygen index (LOI), UL 94, and cone-calorimeter methods. The acrylonitrile- butadiene-styrene preparation with 15–20 wt% fire retardant and 1–2 wt% organic montmorillonite reached a UL-94 V-0 classification, contrasting with the pure acrylonitrile- butadiene-styrene and the acrylonitrile-butadiene-styrene with 15 wt% fire retardant and acrylonitrile-butadiene-styrene with 1–2 wt% organic montmorillonite formulations, which completely burned. Finally, the samples showed a very good synergy going to a higher reduction of the peak heat release rate and to a minimum mass reduction, as obtained from cone calorimeter tests. Full article
(This article belongs to the Special Issue Polymeric Composites Reinforced with Nanoparticles)
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Article
Experimental Analysis on the Application of Polymer Matrix Composites Containing Al2O3 for Automotive Lamp Reflector
Appl. Sci. 2019, 9(21), 4525; https://doi.org/10.3390/app9214525 - 25 Oct 2019
Cited by 2 | Viewed by 877
Abstract
As automotive lamps are highly integrated, the heat generated from bulbs reduces the light quantity and lifespan of the bulbs. Numerous studies have been actively conducted worldwide on heat dissipation designs and material modifications for heat release. In this study, an analysis was [...] Read more.
As automotive lamps are highly integrated, the heat generated from bulbs reduces the light quantity and lifespan of the bulbs. Numerous studies have been actively conducted worldwide on heat dissipation designs and material modifications for heat release. In this study, an analysis was carried out of the mechanical, thermal, and morphological characteristics of Polybutylene Terephthalate (PBT) and Polyamide (PA6) matrix composites containing alumina filler; further, their flowability and injection moldability were also studied. The PA6 matrix that was subjected to an addition of 60% alumina was selected as the sample. To compare the performances of the selected composites with that of the fog lamp reflector manufactured with conventional PBT, fog lamp reflectors were fabricated. When 60% alumina was added, the thermal conductivity was improved. Thus, the maximum temperature of the lamp reflector was reduced, and the heat was transferred to the surroundings; this was in contrast to the fog lamp reflector fabricated with conventional PBT. Full article
(This article belongs to the Special Issue Polymeric Composites Reinforced with Nanoparticles)
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Review
Mechanical Properties of Sandwich Composites Reinforced by Nanoclays: An Overview
Appl. Sci. 2020, 10(7), 2637; https://doi.org/10.3390/app10072637 - 10 Apr 2020
Viewed by 990
Abstract
Structural sandwich composites have been widely used in many engineering applications, and this trend continues due to their superior mechanical properties, thermal insulation and acoustic damping. However, to further improve their mechanical properties, literature reports significant benefits obtained with nano-reinforcements. In this context, [...] Read more.
Structural sandwich composites have been widely used in many engineering applications, and this trend continues due to their superior mechanical properties, thermal insulation and acoustic damping. However, to further improve their mechanical properties, literature reports significant benefits obtained with nano-reinforcements. In this context, nanoclays are the most popular nano-reinforcements for polymeric nanocomposites, due to their relatively high ion exchange capacity, high aspect ratio and economic advantages. In order to stablish a systematic understanding for design criteria, this work intends to summarize all studies present in the open literature about this topic. It was possible to conclude that using nanoclays improves the mechanical properties of structural sandwich composites, especially in terms of impact strength. Nevertheless, the benefits obtained regarding fatigue performance are not adequately reported in the literature, revealing the need to develop these studies. Full article
(This article belongs to the Special Issue Polymeric Composites Reinforced with Nanoparticles)
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