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Polymers
Special Issues
Hybrid and Biocomposites in Polymers
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Hybrid and Biocomposites in Polymers

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Biomacromolecules, Biobased and Biodegradable Polymers".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 2674

Special Issue Editors

Dr. Marius Marinel Stănescu

E-Mail Website
Guest Editor
Department of Applied Mechanics and Civil Constructions, University of Craiova, Craiova, Romania
Interests: hybrid resins; natural resins; natural reinforcers; composite materials; manufacture of hybrid composites; manufacture of biocomposites; mechanical properties; chemical properties; biodegradability
Special Issues, Collections and Topics in MDPI journals
Dr. Bolcu Dumitru

E-Mail Website
Guest Editor
Department of Applied Mechanics and Civil Constructions, University of Craiova, Craiova, Romania
Interests: hybrid resins; natural resins; natural reinforcements; composite materials; manufacture of hybrid composites; manufacture of biocomposites; mechanical properties; chemical properties; biodegradability
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

To protect the world in which we live, we must find solutions to existing environmental challenges. One solution requires the sustainable production of equipment and consumer goods via the use of materials that come from resources that rapidly regenerate, are partially or fully recyclable, and are low-cost. This includes hybrid composites and biocomposites, which are mainly manufactured from constituents that are abundant in nature. The multitude of combinations that can be realized using various types of matrices (from natural or hybrid resins) and natural reinforcements (fabrics or fibers) generates the possibility of obtaining composite materials with a diverse range of mechanical, thermal, and chemical properties. Studies on the properties of matrix/reinforcement components, both separately and in combination, and the possibility of  controlling these properties through various combinations of matrix/reinforcement components, represent a challenge for any research team. An improved understanding of the properties of these compositions would enable their use for the manufacture of components used in areas including: the construction of vehicles, aircraft, and ships; sports equipment and medical orthotics; furniture elements; and civil, industrial, and agricultural construction. Both original contributions and synthesis articles (comprehensive reviews) are welcome. This Special Issue is dedicated to the latest research on the fabrication, properties, and application areas of hybrid composites and biocomposites.

Dr. Marius Marinel Stănescu
Dr. Bolcu Dumitru
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

  • hybrid resins
  • natural resins
  • natural reinforcers
  • composite materials
  • the manufacture of hybrid composites
  • the manufacture of biocomposites
  • mechanical properties
  • chemical properties
  • biodegradability

Published Papers (2 papers)

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Research

21 pages, 16015 KiB  
Article
Effect of Moisture on the Mechanical Properties of Wood–Plastic Composites Hybridized with Metal Grid Layers
by Srdjan Perišić, Katarina Kalevski, Aleksandar Grujić, Dragutin Nedeljković, Jasna Stajić-Trošić and Vesna Radojević
Polymers 2023, 15(24), 4705; https://doi.org/10.3390/polym15244705 - 14 Dec 2023
Viewed by 891
Abstract
Wood–plastic composites (WPCs) are some of the most common modern composite materials for interior and exterior design that combine natural waste wood properties and the molding possibility of a thermoplastic polymer binder. The addition of reinforcing elements, binding agents, pigments, and coatings, as [...] Read more.
Wood–plastic composites (WPCs) are some of the most common modern composite materials for interior and exterior design that combine natural waste wood properties and the molding possibility of a thermoplastic polymer binder. The addition of reinforcing elements, binding agents, pigments, and coatings, as well as changes to the microstructure and composition, can all affect the quality of WPCs for particular purposes. To improve the properties, hybrid composite panels of WPCs with 30 wt. % and 40 wt. % of wood content and reinforced with one or three metal grid layers were prepared sequentially by extrusion and hot pressure molding. The results show an average 20% higher moisture absorption for composites with higher wood content. A high impact test (HIT) revealed that the absorbed energy of deformation increased with the number of metal grid layers, regardless of the wood content, around two times for all samples before water immersion and around ten times after water absorption. Also, absorbed energy increases with raised wood content, which is most pronounced in three-metal-grid samples, from 21 J to 26 J (before swelling) and from 15 J to 24 J (after swelling). Flexural tests follow the trends observed by HIT, indicating around 65% higher strength for samples with three metal grid layers vs. samples without a metal grid before water immersion and around 80% higher strength for samples with three metal grid layers vs. samples without a grid after water absorption. The synthesis route, double reinforcing (wood and metal), applied methods of characterization, and optimization according to the obtained results provide a WPC with improved mechanical properties ready for an outdoor purpose. Full article
(This article belongs to the Special Issue Hybrid and Biocomposites in Polymers)
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13 pages, 3555 KiB  
Article
A Simple and Effective Method to Enhance the Mechanical Properties, Dimensional Stability, and Mildew Resistance of Bamboo Scrimber
by Jiayu Xu, Zhezhe Zhou, Xiaochun Zhang and Yantao Xu
Polymers 2023, 15(20), 4162; https://doi.org/10.3390/polym15204162 - 20 Oct 2023
Cited by 1 | Viewed by 971
Abstract
Given the increasingly prominent contradiction between the supply of and demand for wood, the abundant resource of bamboo can be a good substitute. Bamboo scrimber can effectively improve the utilization rate of bamboo and has good mechanical properties. However, bamboo scrimber has the [...] Read more.
Given the increasingly prominent contradiction between the supply of and demand for wood, the abundant resource of bamboo can be a good substitute. Bamboo scrimber can effectively improve the utilization rate of bamboo and has good mechanical properties. However, bamboo scrimber has the problem of poor mildew resistance, and does not meet the requirements for outdoor applications. In this study, in order to further improve the mildew resistance and mechanical properties of bamboo scrimber, alkali treatment was used to remove some nutrients from the bamboo bundles and change the pH of the bamboo scrimber. The results showed that nutrients such as hemicellulose, lignin, starch, and sugar were notably removed from bamboo bundles, and the pH of bamboo was slightly alkaline. The anti-mildew effect was significantly enhanced, which could allow use in outdoor environments, and the mechanical properties and dimensional stability were also improved. Among them, TB6 bamboo scrimber showed comprehensively excellent properties. The infection time in the laboratory mildew test increased from 3 days to more than 30 days, and the infection time in the outdoor mildew resistance test increased from 1 week to more than 8 weeks; the static bending intensity of TB6 increased by 62.6% to 150 MPa, and the bending modulus increased by 71.7% to 14.2 GPa; the change rate of water absorption thickness was reduced to 0.58%. This modification method effectively improved the mildew resistance of bamboo scrimber, while maintaining high mechanical strength, and provides a new method for the outdoor application of bamboo scrimber. Full article
(This article belongs to the Special Issue Hybrid and Biocomposites in Polymers)
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