Thermal and Mechanical Properties of Advanced Polymeric and Amorphous Materials

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

Deadline for manuscript submissions: 30 August 2024 | Viewed by 2873

Special Issue Editors


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Guest Editor
Division of Mathematics and Engineering Sciences, Department of Military Sciences, Hellenic Army Academy, 16673 Vari, Greece
Interests: molecular spectroscopy; Raman spectroscopy; multifunctional materials; antiballistic materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Recent technological advancements in the use of polymeric and amorphous materials have resulted in the synthesis of innovative and multifunctional materials. Some of the most intriguing and important applications of these materials have dealt with enhancing their mechanical and thermal properties, aiming at delivering stronger, lighter, and more durable polymeric materials under extreme conditions.

This Special Issue aims at highlighting recent scientific advancements in the field of the synthesis of novel polymeric materials possessing novel mechanical and thermal properties. It will also focus both on basic and applied research in the abovementioned fields. This Special Issue will host original research and review articles aiming to provide new scientific knowledge in, but not limited to, the following fields:

  • Novel polymeric and amorphous materials' synthesis;
  • Novel polymeric and amorphous materials’ thermal properties;
  • Novel polymeric and amorphous materials’ mechanical properties;
  • Novel polymeric and amorphous materials’ applications;
  • Novel polymeric and amorphous materials in extreme environments;
  • Structural properties of novel polymeric and amorphous materials.

Dr. Nektarios Nasikas
Dr. Dionysis E. Mouzakis
Guest Editors

Manuscript Submission Information

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Keywords

  • polymeric materials
  • amorphous materials
  • mechanical properties
  • thermal properties
  • extreme environments
  • novel polymeric material synthesis
  • polymeric and amorphous material applications

Published Papers (2 papers)

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Research

24 pages, 14012 KiB  
Article
Operational Performance and Energy Efficiency of MEX 3D Printing with Polyamide 6 (PA6): Multi-Objective Optimization of Seven Control Settings Supported by L27 Robust Design
by Constantine David, Dimitrios Sagris, Markos Petousis, Nektarios K. Nasikas, Amalia Moutsopoulou, Evangelos Sfakiotakis, Nikolaos Mountakis, Chrysa Charou and Nectarios Vidakis
Appl. Sci. 2023, 13(15), 8819; https://doi.org/10.3390/app13158819 - 30 Jul 2023
Cited by 10 | Viewed by 1296
Abstract
Both energy efficiency and robustness are popular demands for 3D-printed components nowadays. These opposing factors require compromises. This study examines the effects of seven general control variables on the energy demands and the compressive responses of polyamide (PA6) material extrusion (MEX) 3D printed [...] Read more.
Both energy efficiency and robustness are popular demands for 3D-printed components nowadays. These opposing factors require compromises. This study examines the effects of seven general control variables on the energy demands and the compressive responses of polyamide (PA6) material extrusion (MEX) 3D printed samples. Nozzle Temperature, Layer Thickness, Orientation Angle, Raster Deposition Angle, Printing Speed, Bed Temperature, and Infill Density were studied. An L27 orthogonal array was compiled with five replicas. A total of 135 trials were conducted, following the ASTM D695-02a specifications. The stopwatch method was used to assess the construction time and energy usage. The compressive strength, toughness, and elasticity modulus were experimentally determined. The Taguchi technique ranks each control parameter’s impact on each response measure. The control parameter that had the greatest impact on both energy use and printing time was layer thickness. Additionally, the infill density had the greatest influence on the compressive strength. Quadratic regression model equations were formed for each of the response measures. The ideal compromise between mechanical strength and energy efficiency is now reported, with merit related to technological and economic benefits. Full article
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17 pages, 2280 KiB  
Article
How Ultrasonic Pulse-Echo Techniques and Numerical Simulations Can Work Together in the Evaluation of the Elastic Properties of Glasses
by Panagiota Siafarika, Nektarios K. Nasikas and Angelos G. Kalampounias
Appl. Sci. 2023, 13(14), 8240; https://doi.org/10.3390/app13148240 - 16 Jul 2023
Viewed by 1147
Abstract
This paper presents the numerical simulation of the ultrasonic wave transmittance utilizing the elastodynamic finite integration technique (EFIT). With this methodology, it is possible to simulate the propagation of the ultrasound in a medium with a relatively low computational cost. The capability of [...] Read more.
This paper presents the numerical simulation of the ultrasonic wave transmittance utilizing the elastodynamic finite integration technique (EFIT). With this methodology, it is possible to simulate the propagation of the ultrasound in a medium with a relatively low computational cost. The capability of this technique for determining the elastic properties of fluorophosphate and the aluminosilicate glasses is described in detail. The elastic constants of the glasses were calculated from the theoretically predicted longitudinal and transversal sound velocities and compared with the corresponding experimental data. Furthermore, the calculated and experimental elastic properties of the fluorophosphate and aluminosilicate glasses were correlated with the structural peculiarities of these glasses. This simulation technique is also suitable for unveiling the existence of possible defects in the glasses by comparing the experimental and simulation data. The EFIT technique is shown to be a very useful tool in order to provide fast and easy-to-acquire data regarding also the structural characteristics of various glassy systems. This can be used in conjunction with other spectroscopic techniques which can prove to be extremely useful for the non-destructive testing of vitreous materials. The latter can prove very important when vitreous materials used in optical or optoelectronic applications need continuous monitoring in order to ensure their optimum operation and functionality with limited intervention. The main contribution of this paper is the treatment of numerical time-domain modeling of 2D acoustic wave propagation in a viscoelastic medium by implementing the elastodynamic finite integration technique (EFIT). Full article
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