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Polymers
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Multifunctional Polymers and Their Composites and Structures: Design, Preparation and...
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Multifunctional Polymers and Their Composites and Structures: Design, Preparation and Properties—Second Edition

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

Deadline for manuscript submissions: 20 June 2025 | Viewed by 3074

Special Issue Editor

Dr. Yong Tao

E-Mail Website
Guest Editor
School of Civil Engineering, Central South University, Changsha 410083, China
Interests: mechanical properties of cellular materials; multifunctional polymer composites and structures; additive manufacturing; design and characterization of mechanical metamaterials; bioinspired materials; impact dynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Further to the success of the first edition of this Special Issue of Polymers, entitled “Multifunctional Polymers and Their Composites and Structures: Design, Preparation and Properties”, we are delighted to reopen this Special Issue, now entitled “Multifunctional Polymers and Their Composites and Structures: Design, Preparation and Properties—Second Edition”.

In recent decades, multifunctional polymer materials and their composites and structures have attracted considerable attention in academic and industrial communities. This Special Issue aims to present recent advances in various polymer materials, as well as their composites and structures, while also discussing potential research directions to promote their further development. The topic of this Special Issue is quite extensive, including the design, preparation, properties, characterization, functionalization, etc., of polymer materials and their composites and structures. Original research articles and reviews are welcome to be submitted.

Dr. Yong Tao
Guest Editor

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

  • multifunctional polymer materials
  • polymer composite materials
  • polymer structures
  • design methods
  • preparation methods
  • multifunctional properties
  • theoretical modeling
  • experimental investigation
  • finite element analysis

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Published Papers (3 papers)

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Research

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13 pages, 4185 KiB  
Article
Out-of-Plane Mechanical Behavior of 3D-Printed Polymeric Circular-Vertex-Based Hierarchical Hexagonal Honeycombs
by Yong Tao, Xiyu Chen and Siping Lu
Polymers 2025, 17(7), 862; https://doi.org/10.3390/polym17070862 - 24 Mar 2025
Viewed by 310
Abstract
Many studies show that hierarchical honeycombs have a superior performance compared to regular honeycombs. However, relevant experimental studies are limited due to the fabrication challenges of hierarchical honeycombs featuring complex geometries. In this study, circular-vertex-based hierarchical hexagonal honeycombs (CHHHs) with different hierarchical parameters [...] Read more.
Many studies show that hierarchical honeycombs have a superior performance compared to regular honeycombs. However, relevant experimental studies are limited due to the fabrication challenges of hierarchical honeycombs featuring complex geometries. In this study, circular-vertex-based hierarchical hexagonal honeycombs (CHHHs) with different hierarchical parameters were fabricated using a polymeric 3D-printing technique, and their quasi-static out-of-plane mechanical behavior was investigated. The CHHHs were constructed by replacing each solid vertex of a regular hexagonal honeycomb (RHH) with a circular vertex. Quasi-static compression tests were conducted on CHHHs, and the effect of the hierarchical parameter on the deformation modes, mechanical properties, and energy absorption characteristics was investigated. The results revealed that both the CHHH and RHH specimens experienced cell wall fractures during compression, while the CHHH exhibited enhanced damage resistance, compressive strength, and specific energy absorption (SEA) compared to RHH. This study contributes to understanding the effect of circular-vertex-based hierarchy on the out-of-plane mechanical behavior of regular honeycombs. Full article
(This article belongs to the Special Issue Multifunctional Polymers and Their Composites and Structures: Design, Preparation and Properties—Second Edition)
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15 pages, 12357 KiB  
Article
Fabrication of Polydopamine/hemin/TiO2 Composites with Enhanced Visible Light Absorption for Efficient Photocatalytic Degradation of Methylene Blue
by Zhuandong Zhu, Shengrong Zhou, Debin Tian, Guang-Zhao Li, Gang Chen, Dong Fang, Jiaxuan Cao, Fumei Wang, Wenyan Wang, Xuewei He and Wei Zhang
Polymers 2025, 17(3), 311; https://doi.org/10.3390/polym17030311 - 24 Jan 2025
Viewed by 728
Abstract
With the rapid progression of industrialization, water pollution has emerged as an increasingly critical issue, especially due to the release of organic dyes such as methylene blue (MB), which poses serious threats to both the environment and human health. Developing efficient photocatalysts to [...] Read more.
With the rapid progression of industrialization, water pollution has emerged as an increasingly critical issue, especially due to the release of organic dyes such as methylene blue (MB), which poses serious threats to both the environment and human health. Developing efficient photocatalysts to effectively degrade these pollutants is therefore of paramount importance. In this work, titanium dioxide (TiO2) was modified with the photosensitizer hemin and the hydroxyl-rich polymer polydopamine (PDA) to enhance its photocatalytic degradation performance. Hemin and PDA function as photosensitizers, extending the light absorption of TiO2 into the visible spectrum, reducing its bandgap energy, and effectively promoting separation of photogenerated electron–hole pairs through conjugated structures. Additionally, the strong adhesion of PDA enabled the rapid transfer and effective utilization of photogenerated electrons, while its abundant phenolic hydroxyls increased MB adsorption on the photocatalyst’s surface. Experimental results demonstrated a significant enhancement in photocatalytic activity, with the 1%PDA/3%hemin/TiO2 composite achieving degradation rates of 91.79% under UV light and 71.53% under visible light within 120 min, representing 2.22- and 2.05-fold increases compared to unmodified TiO2, respectively. This research presents an effective modification approach and provides important guidance for designing high-performance TiO2-based photocatalysts aimed at environmental remediation. Full article
(This article belongs to the Special Issue Multifunctional Polymers and Their Composites and Structures: Design, Preparation and Properties—Second Edition)
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Review

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24 pages, 4923 KiB  
Review
Proposal of a Modular Classification System for Direct Dental Resin Composites Based on Clinical Applications
by Philippe Francois, Mathieu Izart, Timothy Fasham, Yasmine Smail, Marie Jannot, Stéphane Le Goff, Fleur Beres, Max Troizier-Cheyne, Sara Bergman, Christian Moussally, Sarah Abdel-Gawad, Elisabeth Dursun, Romain Ceinos, Elisa Caussin and Jean-Pierre Attal
Polymers 2025, 17(5), 564; https://doi.org/10.3390/polym17050564 - 20 Feb 2025
Viewed by 1609
Abstract
The adhesive–resin composite pair has been the cornerstone of direct restorations in dentistry for many years. Resin composites are traditionally classified in three ways based on their inorganic structure, their organic composition and their viscosity. While these classifications have long been associated with [...] Read more.
The adhesive–resin composite pair has been the cornerstone of direct restorations in dentistry for many years. Resin composites are traditionally classified in three ways based on their inorganic structure, their organic composition and their viscosity. While these classifications have long been associated with the optical, mechanical, and clinical properties of resin composites, recent studies indicate that this classification is not always valid. In recent years, a significant expansion of the range of clinical resin composite families has occurred, each with varying degrees of validation through in vitro and clinical studies. As a result, new resin composites with distinct structures, viscosities, and clinical indications have emerged. Despite this progress, a formal classification of the clinical features of all resin composites is still lacking, leading to terminological inconsistencies in research and potential confusion among clinicians. This brief review, supported by an exhaustive search of the dental literature, proposes a new clinical classification system for resin composites based on their key clinical features to help clinicians and researchers easily identify the key clinical characteristics of formulations. This modular classification, encompassing eight main families and 14 characteristics, is particularly suited to future developments, as current trends aim to simplify procedures by integrating multiple formulations into single products. Full article
(This article belongs to the Special Issue Multifunctional Polymers and Their Composites and Structures: Design, Preparation and Properties—Second Edition)
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