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Polymer Composites: Design, Manufacturing and Recycling
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Polymer Composites: Design, Manufacturing and Recycling

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

Deadline for manuscript submissions: closed (20 January 2024) | Viewed by 2007

Special Issue Editor

Prof. Dr. Junfeng Su

E-Mail Website
Guest Editor
Department of Polymer Science, School of Material Science and Engineering, Tiangong University, Tianjin 300387, China
Interests: polymer composite; nanomaterial; functional material; self-healing material; biopolymer; biodegradation materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Polymer composite materials have a wide range of applications, such as in transportation, civil construction, electrical and electronic equipment, pipes and tanks, marine environments, energy conversion, and consumers goods. They play a key role in the development of lightweight structures with outstanding mechanical properties, high reliability, and environmental resistance. The structure and performance of polymer composites are directly influenced by design and manufacturing. Due to the requirements of environmental protection, the recycling of polymer composites has also received attention from researchers and engineering technicians.

This Special Issue, “Polymer Composite Design, Manufacturing and Recycling”, provides a forum for the rapid publication of original articles on the fundamental and applied science of polymer composites. Both experimental and theoretical works on the synthesis, design, characterization, manufacturing, recycling, and applications of polymer composites in different areas are welcome. Contributions are encouraged not only on traditional fiber-reinforced composites, but also on novel composites such as nanocomposites, biopolymer composites, green/eco composites, composites for energy storage, bio-inspired and biomimetic composites, and multi-scale and multifunctional polymer composites.

All manuscripts to be considered for publication in this Special Issue will undergo a rigorous peer-review process, and decisions will be based on the recommendations of independent reviewers.

Prof. Dr. Junfeng Su
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. 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

  • polymer composites
  • design
  • manufacturing
  • recycling
  • material structure

Published Papers (2 papers)

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Research

20 pages, 3292 KiB  
Article
Multiscale Mathematical Analysis of Influencing Factors and Experimental Verification of Microcrack Self-Healing Efficiency of Bitumen Composites Using Microcapsules
by Xin-Yu Wang, Qian Sun, Sai Wang, Rong-Yue Shao and Jun-Feng Su
Materials 2023, 16(14), 5073; https://doi.org/10.3390/ma16145073 - 18 Jul 2023
Viewed by 808
Abstract
The preparation and application of microcapsules containing healing agents have become a crucial way to enhance the self-healing capability of bitumen. This intelligent material has become a hot topic in the field of pavement material and has greatly stimulated the development and applications [...] Read more.
The preparation and application of microcapsules containing healing agents have become a crucial way to enhance the self-healing capability of bitumen. This intelligent material has become a hot topic in the field of pavement material and has greatly stimulated the development and applications of pavement engineering. However, there has been no research focused on the relationship of the multistructures from the viewpoint of molecular-size, microsize, and macrosize, which significantly limits the predictions of the self-healing efficiency and structure design of this self-healing material. The purpose of this study was to make a mathematical analysis of the influencing factors of self-healing efficiency based on the self-healing mechanism of bitumen using microcapsules, fully considering the structural dimensions, preparation conditions, and self-healing conditions. In the mathematical analysis, the cross-linking degree of the shell material molecules of the microcapsules was considered for its damage strength from the perspective of molecular structure. The final tip stress of the microcrack was believed to be equal to the puncture strength of the microcapsules in terms of microsize. From a macroscale point of view, the amount of healing agent released from the microcapsule rupture was considered more significant than or equal to the volume of the microcracks. At the same time, the time–temperature superposition principle was applied to simplify the influence factors. The above derivation based on multiscale structures found that the additive amount of the microcapsules, temperature, and time were the three main influencing factors on the self-healing features of bitumen. Finally, the experimental data was investigated considering the three factors, which thoroughly verified the feasibility of the derivation. All results will help to establish a bridge between the initial structural design of self-healing bitumen and the prediction of the final self-healing effects. Full article
(This article belongs to the Special Issue Polymer Composites: Design, Manufacturing and Recycling)
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16 pages, 3673 KiB  
Article
Investigation of Asphalt Self-Healing Capability Using Microvasculars Containing Rejuvenator: Effects of Microvascular Content, Self-Healing Time and Temperature
by Qian Sun, Xin-Yu Wang, Sai Wang, Rong-Yue Shao and Jun-Feng Su
Materials 2023, 16(13), 4746; https://doi.org/10.3390/ma16134746 - 30 Jun 2023
Cited by 3 | Viewed by 959
Abstract
The oily rejuvenator acted as the healing agent in microvasculars. A tensile test was designed to evaluate the self-healing efficiency of asphalt affected by microvascular number, self-healing time and temperature. It was found that the healing agent was slowly released through the microporous [...] Read more.
The oily rejuvenator acted as the healing agent in microvasculars. A tensile test was designed to evaluate the self-healing efficiency of asphalt affected by microvascular number, self-healing time and temperature. It was found that the healing agent was slowly released through the microporous channels on the inner shell of the microvascular. The release modes of the agent can work together to improve the self-healing efficiency. The self-healing values of the three samples (asphalt, asphalt/microvasculars without rejuvenator and asphalt/microvasculars with rejuvenator) are 51%, 53%, and 71%. The self-healing capability of the asphalt samples with a healing agent is much greater than that of the other two without a healing agent at the same time. More microvascular rupture at the asphalt sample interface led to a higher self-healing efficiency. The self-healing efficiency values of the three samples (asphalt samples with one, two, and three microvasculars) are 52%, 67%, and 73%, respectively. The self-healing efficiency of the same sample increased during 1–3 days from 26% to 88% in one self-healing cycle. The self-healing efficiency value indicated that increasing the temperature improved each sample’s self-healing efficiency. The above trend of change also applies to the second self-healing process. A higher temperature reduces the resistance to molecular motion and accelerates the molecular action of bitumen and the healing agent. The time–temperature equivalence principle can be fully applied to comprehend asphalt self-healing. Full article
(This article belongs to the Special Issue Polymer Composites: Design, Manufacturing and Recycling)
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