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Special Issue "Microstructure and Mechanical Properties of Polymeric Materials"

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Simulation and Design".

Deadline for manuscript submissions: 20 February 2024 | Viewed by 5263

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Prof. Dr. Paulo Nobre Balbis dos Reis

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Department of Mechanical Engineering, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal
Interests: polymer-based composites; polymer-based nanocomposites; mechanical behavior
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Dear Colleagues,

On behalf of the journal Materials, I would like to invite all researchers to publish a paper in this Special Issue entitled “Microstructure and Mechanical Properties of Polymeric Materials”. It is well known that, nowadays, polymeric materials are increasingly used in the most diverse areas, either alone, reinforced by nanoparticles or as a matrix of composite materials. On the other hand, sustainable polymers obtained from renewable resources are increasingly desired due to current government policies based on sustainability, concerns about the depletion of fossil resources, disposal and related issues. In this context, fundamental knowledge in terms of structure and/or mechanical properties is required to increase their use or replace the current ones with others that have a more sustainable nature.

In this context, this Special Issue intends to collect original research and comprehensive review papers in order to understand the current state of the art, as well as to obtain information on possible correlations between the structure and mechanical properties of polymers. All relevant contributions to this Special Issue are welcome.

Prof. Dr. Paulo Nobre Balbis dos Reis
Guest Editor

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Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

polymers
microstructure
mechanical properties

Published Papers (3 papers)

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Research

12 pages, 6760 KiB

Open AccessArticle

Effect of Impact Position on Repaired Composite Laminates Subjected to Multi-Impacts

Paulo N. B. Reis

Sara R. M. Coelho

and

Abderrezak Bezazi

Materials 2022, 15(22), 8039; https://doi.org/10.3390/ma15228039 - 14 Nov 2022

Cited by 1 | Viewed by 887

Abstract

Because the certification of aircraft structures requires significant costs and time-consuming experimental tests, all the studies carried out are strong contributions to the applicability of repairs based on adhesively bonded fibre composite patches. In this context, the main goal of this study aims to analyse the effect of the impact position on the multi-impact response of repaired composites. The results will be compared with those obtained in composites containing holes. Therefore, experimental tests will be carried out using an energy of 8 J and centrally supported samples. It was noted that the patch region proved to be very sensitive to impact due to its thickness. Full perforation occurred after two to three impacts, and to obtain higher strength it would be necessary to increase the thickness of the patch. However, depending on the location of the repair, this could bring aerodynamic problems. For the distance of 15 mm from the centre, an overlap region, the repaired laminate shows 494.7% higher impact strength than a laminate with a hole. In this case, the effect of the stress concentration is determinant in the impact fatigue life. Finally, for the 35 mm distances that are close to the border, no significant changes in impact fatigue life were observed for both the repaired laminates and those containing the hole. This leads to the conclusion that the border effect is much more significant than the presence of the hole for this distance. Full article

(This article belongs to the Special Issue Microstructure and Mechanical Properties of Polymeric Materials)

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14 pages, 6023 KiB

Open AccessArticle

Hybridization Effects on Bending and Interlaminar Shear Strength of Composite Laminates

and

Materials 2022, 15(4), 1302; https://doi.org/10.3390/ma15041302 - 10 Feb 2022

Cited by 8 | Viewed by 1625

Abstract

Fiber-reinforced composites are gradually replacing the traditional materials in many engineering applications. However, for many applications these materials are still unsuitable, due to their lack of toughness. In this context, hybridization is a promising strategy in which two or more types of fiber are combined to obtain a better balance of mechanical properties compared to non-hybrid composites. Therefore, the main goal of this work is to study the hybridization effect on the static performance and interlaminar shear strength. For this purpose, carbon, glass, and Kevlar fibers were used and combined in different proportions. It was possible to conclude that there is an ideal value of fiber content to maximize both properties and, depending on the type of fiber, they should be placed specifically on the compression or tensile side. For example, for composites involving carbon and glass fibers the latter must be placed on the compression side, and for a value of 17% by weight the flexural strength decreases by only 2.8% and the bending modulus by around 19.8%. On the other hand, when Kevlar fibers are combined with glass or carbon fibers, the Kevlar ones must always be placed on the tensile side and with an ideal value of 13% by weight. Full article

(This article belongs to the Special Issue Microstructure and Mechanical Properties of Polymeric Materials)

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20 pages, 4425 KiB

Open AccessArticle

Structure Tuning and Electrical Properties of Mixed PVDF and Nylon Nanofibers

and

Materials 2021, 14(20), 6096; https://doi.org/10.3390/ma14206096 - 15 Oct 2021

Cited by 14 | Viewed by 2104

Abstract

The paper specifies the electrostatic spinning process of specific polymeric materials, such as polyvinylidene fluoride (PVDF), polyamide-6 (PA6, Nylon-6) and their combination PVDF/PA6. By combining nanofibers from two different materials during the spinning process, new structures with different mechanical, chemical, and physical properties can be created. The materials and their combinations were subjected to several measurements: scanning electron microscopy (SEM) to capture topography; contact angle of the liquid wettability on the sample surface to observe hydrophobicity and hydrophilicity; crystallization events were determined by differential scanning calorimetry (DSC); X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and Fourier-transform infrared spectroscopy (FT-IR) to describe properties and their changes at the chemical level. Furthermore, for the electrical properties of the sample, the dielectric characteristics and the piezoelectric coefficient were measured. The advantage of the addition of co-polymers was to control the properties of PVDF samples and understand the reasons for the changed functionality. The innovation point of this work is the complex analysis of PVDF modification caused by mixing with nylon PA6. Here we emphasize that the application of nylon during the spin influences the properties and structure (polarization, crystallization) of PVDF. Full article

(This article belongs to the Special Issue Microstructure and Mechanical Properties of Polymeric Materials)

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