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Waste-Based Polymer Composites (Volume II)

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

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 2014

Special Issue Editor

Special Issue Information

Dear Colleagues,

One of the most crucial trends in the current research on the development of polymer composites is associated with the application of waste raw materials or those generated by other industries as by-products. Such an approach takes into account economic and ecological issues, focusing on reductions in composite costs or environmental impacts. This can be realized by the application of low-cost waste or recycled raw materials, both polymers and fillers. First of all, recycled and waste materials are significantly cheaper than virgin raw materials. In the case of polymers, the price of recyclates is often over 50% lower. Considering the potential candidates for fillers, they are often wastes or by-products from different industries, without industrial applications, so they are subjected to landfilling. Therefore, their cost can often be negligible. Except for economic factors, such an approach should be considered as ecologically beneficial. The application of waste or recycled materials may often provide utilization methods and should be considered a step towards the often emphasized circular economy. 

Because of the richness of potential innovations and future developments, the editors are pleased to launch this Special Issue and invite researchers to contribute their original research papers and reviews on the structure, performance, and applications of waste-based polymer composites. 

Topics include (but are not limited to) the following:

  • Recycled polymer materials as matrices for composites;
  • Waste-based fillers for polymer composites;
  • Structure–property relationships of polymer composites;
  • Novel applications of waste-based polymer composites;
  • Biodegradable and sustainable waste-based polymer composites;
  • Life cycle assessment of waste-based polymer composites.

Dr. Aleksander Hejna
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
  • waste
  • recycling
  • by-products
  • circular economy

Published Papers (1 paper)

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Research

21 pages, 11224 KiB  
Article
One More Step towards a Circular Economy for Thermal Insulation Materials—Development of Composites Highly Filled with Waste Polyurethane (PU) Foam for Potential Use in the Building Industry
by Łukasz Kowalczyk, Jerzy Korol, Błażej Chmielnicki, Aleksandra Laska, Daniel Chuchala and Aleksander Hejna
Materials 2023, 16(2), 782; https://doi.org/10.3390/ma16020782 - 12 Jan 2023
Cited by 1 | Viewed by 1732
Abstract
The rapid development of the building sector has created increased demand for novel materials and technologies, while on the other hand resulting in the generation of a severe amount of waste materials. Among these are polyurethane (PU) foams, which are commonly applied as [...] Read more.
The rapid development of the building sector has created increased demand for novel materials and technologies, while on the other hand resulting in the generation of a severe amount of waste materials. Among these are polyurethane (PU) foams, which are commonly applied as thermal insulation materials. Their management is a serious industrial problem, due to, for example, their complex chemical composition. Although some chemical and thermochemical methods of PU foam recycling are known, their broader use is limited due to requirements related to the complexity and safety of their installation, thus implicating high costs. Therefore, material recycling poses a promising alternative. The incorporation of waste PU foams as fillers for polymer composites could make it possible to take advantage of their structure and performance. Herein, polypropylene-based composites that were highly filled with waste PU foam and modified using foaming agents were prepared and analyzed. Depending on the foam loading and the foaming agent applied, the apparent density of material was reduced by as much as 68%. The efficient development of a porous structure, confirmed by scanning electron microscopy and high-resolution computed micro-tomography, enabled a 64% decrease in the thermal conductivity coefficient. The foaming of the structure affected the mechanical performance of composites, resulting in a deterioration of their tensile and compressive performance. Therefore, developing samples of the analyzed composites with the desired performance would require identifying the proper balance between mechanical strength and economic, as well as ecological (share of waste material in composite, apparent density of material), considerations. Full article
(This article belongs to the Special Issue Waste-Based Polymer Composites (Volume II))
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