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Polymers
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Additive Manufacturing of Polymer Based Materials
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Additive Manufacturing of Polymer Based Materials

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Processing and Engineering".

Deadline for manuscript submissions: 10 May 2025 | Viewed by 2718

Special Issue Editors

Prof. Dr. Dana Luca Motoc

E-Mail Website
Guest Editor
Department of Automotive and Transport Engineering, Faculty of Mechanical Engineering, Transilvania University of Brașov, 500036 Brașov, Romania
Interests: polymer composites; coatings; composite micromechanics; mechanical/thermal/dynamic-mechanical/electrical/optical properties
Special Issues, Collections and Topics in MDPI journals
Dr. Santiago Ferrándiz-Bou

E-Mail Website
Guest Editor
Instituto Universitario de Investigación de Tecnología de los Materiales (IUITM), Universitat Politècnica de València (UPV), 03801 Alcoy, Spain
Interests: additive printing; injection; polymer and polymer composites; material characterization; FEM simulation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

You are invited to submit to this Special Issue of Polymers. We are looking for research papers, reviews or short communications covering topics on the additive manufacturing of (bio)polymers and composites thereof. Topics of particular interest include, but are not limited to, the following:

  • The synthesis and development of novel (bio)polymer formulations suitable for a wide range of additive processes, such as fused deposition modeling (FDM), selective laser sintering (SLS), direct light processing (DLP), laminated object manufacturing (LOM), etc.;
  • Additively tailored synthetic/natural filler-reinforced composites;
  • (Bio)polymer and/or composite characterization and performance (e.g., mechanical, thermal, dynamic-mechanical, electrical, chemical, biological, optical, etc.);
  • The relationship between process–structure–material properties;
  • The optimization of process parameters;
  • The modeling and simulation of processes and materials;
  • Application-driven solutions (e.g., energy storage/harvesting, biomedical, engineering, robotics, optoelectronics, sensors, etc.).

Prof. Dr. Dana Luca Motoc
Dr. Santiago Ferrándiz-Bou
Guest Editors

Manuscript Submission Information

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. Polymers 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 2700 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

  • additive manufacturing
  • (bio)polymers
  • (bio)polymer-based composites
  • material characterization
  • modeling and simulation
  • applications

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Related Special Issue

Published Papers (3 papers)

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Research

23 pages, 4432 KiB  
Article
Utilization of Ground Eggshell as a Biofiller of Plasticized PVC-Based Materials Fabricated Using Melt Blending
by Katarzyna Skórczewska, Krzysztof Lewandowski, Sławomir Wilczewski, Joanna Szulc and Paulina Rakowska
Polymers 2025, 17(4), 434; https://doi.org/10.3390/polym17040434 - 7 Feb 2025
Viewed by 1097
Abstract
The paper examines the use of waste eggshells as a valuable biofiller for modifying plasticized poly(vinyl chloride) (PVC). The raw ES was characterized using TGA, FTIR, particle size analysis, and XRD. The effects of ES on the processing, mechanical and thermal properties, density, [...] Read more.
The paper examines the use of waste eggshells as a valuable biofiller for modifying plasticized poly(vinyl chloride) (PVC). The raw ES was characterized using TGA, FTIR, particle size analysis, and XRD. The effects of ES on the processing, mechanical and thermal properties, density, porosity, and colour of PVC matrix composites were evaluated compared to pPVC/CC produced using the same methodology. It was found that pPVC/ES exhibits different processing properties to pPVC/CC. The mechanical properties of PVC/ES are slightly lower than those of pPVC/CC at concentrations up to 20 phr. However, at 30 phr and 40 phr, the differences in the mechanical properties of composites with both CC and ES are very similar, and the values are within the designated standard deviation of the measurement. The mechanical properties of PVC/ES do not limit their potential applications. When using eggshell (ES) as a filler, improvements in tensile strength (tts) were observed, ranging from 38% to 61% compared to the unfilled matrix and from 35% to 54% compared to pPVC/CC with an equivalent amount of filler. Although ground eggshells have similar insulating properties to calcium carbonate (CC), they are more effective at scavenging chlorine (Cl•) released during the initial stages of decomposition. This effectiveness helps to slow down the breakdown of PVC, as the eggshells maintain their porous, sponge-like structure when used as a filler. Full article
(This article belongs to the Special Issue Additive Manufacturing of Polymer Based Materials)
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15 pages, 5423 KiB  
Article
Prediction Model for Flake Line Defects in Metallic Injection Molding: Considering Skin-Core Velocity and Alignment
by Seungkwon Choi, Donghwi Park, Seungcheol Lee, Minho Song and Naksoo Kim
Polymers 2025, 17(2), 245; https://doi.org/10.3390/polym17020245 - 20 Jan 2025
Viewed by 642
Abstract
Metallic injection molding combines aluminum flake metallic pigments with polymers to directly produce components with metallic luster, improving production efficiency and reducing environmental impact. However, flake line defects that occur in regions where ribs or flow paths intersect remain a significant challenge. This [...] Read more.
Metallic injection molding combines aluminum flake metallic pigments with polymers to directly produce components with metallic luster, improving production efficiency and reducing environmental impact. However, flake line defects that occur in regions where ribs or flow paths intersect remain a significant challenge. This study proposes a velocity model that considers the flow characteristics between the surface and core layers and an alignment model that incorporates the orientation of aluminum flakes to predict appearance defects. Through this approach, the mechanisms of appearance defect formation were systematized, and the appearance defects caused by flow velocity differences between the surface and core layers, flake alignment uniformity, and reflection angles were visualized. Both prediction models demonstrated a 50% prediction accuracy, successfully identifying two out of four observed defects. This research addresses the limitations of previous prediction methods, which only considered the surface layer, by introducing a novel approach that accounts for the core layer. It is expected to contribute to reducing defects and improving quality in industries requiring high-quality metallic appearances. Full article
(This article belongs to the Special Issue Additive Manufacturing of Polymer Based Materials)
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14 pages, 8037 KiB  
Article
Highlighting Free-Recovery and Work-Generating Shape Memory Effects at 80r-PET Thermoformed Cups
by Ștefan-Dumitru Sava, Bogdan Pricop, Mihai Popa, Nicoleta-Monica Lohan, Elena Matcovschi, Nicanor Cimpoeșu, Radu-Ioachim Comăneci and Leandru-Gheorghe Bujoreanu
Polymers 2024, 16(24), 3598; https://doi.org/10.3390/polym16243598 - 23 Dec 2024
Viewed by 695
Abstract
The paper starts by describing the manufacturing process of cups thermoformed from extruded foils of 80% recycled PET (80r-PET), which comprises heating, hot deep drawing and cooling. The 80r-PET foils were heated up to 120 °C, at heating rates of the order of [...] Read more.
The paper starts by describing the manufacturing process of cups thermoformed from extruded foils of 80% recycled PET (80r-PET), which comprises heating, hot deep drawing and cooling. The 80r-PET foils were heated up to 120 °C, at heating rates of the order of hundreds °C/min, and deep drawn with multiple punchers, having a depth-to-width ratio exceeding 1:1. After puncher-assisted deformation, the cups were air blown away from the punchers, thus being “frozen” in the deformed state. Due to the high cooling rate, most of the polymer’s structure reached a rigid, glassy state, the internal stresses that tended to recover the flat undeformed state were blocked and the polymer remained in a temporary cup form. When heating was applied, glass transition occurred, and the polymer reached a rubbery state and softened. This softening process released the blocked internal stresses and the polymer tended to recover its flat permanent shape. This relative volume contraction quantitatively describes the shape memory effect (SME) which can be obtained either with free recovery (FR-SME) or with work generation (WG-SME) when the cups lifted their bottoms with different loads placed inside them. The paper discusses the results obtained by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), room-temperature tensile failure tests (TENS) and scanning electron microscopy (SEM). The DSC charts emphasized a glass transition, responsible for SME occurrence. The DMA thermograms and the TENS curves revealed that there are slight differences between the storage modulus and the tensile strains of the specimens cut on longitudinal, transversal, or 45° to the film rolling direction. The SEM micrographs enabled to observe structural differences between the specimens cut parallelly and transversally to the film’s rolling direction. The thermoformed cups were heated on a special experimental setup, which enabled the determination of FR-SME and WG-SME after applying different maximum temperatures and loads placed into the cups, respectively. Full article
(This article belongs to the Special Issue Additive Manufacturing of Polymer Based Materials)
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