Degradation Mechanism of Fiber-Reinforced Polymer and Reuse of Fiber-Reinforced Polymer Wastes

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

Deadline for manuscript submissions: 15 April 2025 | Viewed by 1190

Special Issue Editors

Shenzhen University
Interests: composite materials and structures, durability, sustainable construction materials, and structural intervention techniques.
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Guest Editor
Geotechnical and Structural Engineering Research Center of Shandong University, Jinan 250061, China
Interests: composite structure; structural rehabilitation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The shortage of raw construction materials has been one of the most critical obstructions that hinder the sustainable development of the construction industry. The use of sustainable concrete helps to accelerate the step towards achieving carbon neutrality and to provide an alternative to mitigate the negative effects caused by the shortage of raw materials. As a result, it is of great significance to develop sustainable concrete using recycled wastes (including, but not limited to, fiber-reinforced polymer (FRP) wastes) as coarse aggregates. To overcome the natural defects of recycled wastes as coarse aggregates in concrete, notwithstanding the enormous efforts of the academic community and industry, low-cost, eco-friendly, and effective methods are yet to be found. Therefore, new strategies for enhancing the quality of sustainable concrete incorporating recycled wastes are urgently needed, and using degraded and recycled FRP in the forms of fibers, needles, chippings, etc., is a very promising approach. Moreover, the widespread application and non-biodegradable nature of FRP composites make the recycling and reuse of FRP waste feasible but urgent actions. This Special Issue plans to provide an overview of the most recent advances in the field of recycled FRPs and their applications in enhancing sustainable concrete incorporating recycled wastes. This Special Issue aims to showcase selected contributions on advances in the recycling technology, characterization, and application of recycled fibers based on enhancing the quality of sustainable concrete. 

Dr. Biao Hu
Dr. Lei Gao
Guest Editors

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Keywords

  • the degradation mechanisms of FRP in different service environments
  • the residual mechanical properties of deteriorated FRP products
  • methods used to predict the residual mechanical properties of FRP
  • FRP recycling technologies
  • methods used to improve the defects of recycled FRP
  • the development of concrete incorporating recycled FRP
  • the stress–strain modeling of concrete incorporating recycled FRP
  • the durability of concrete incorporating recycled FRP
  • the structural use of concrete incorporating recycled FRP

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Published Papers (1 paper)

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15 pages, 3632 KiB  
Article
Composites from Recycled Polypropylene and Carboxymethylcellulose with Potential Uses in the Interior Design of Vehicles
by Alina Ruxandra Caramitu, Romeo Cristian Ciobanu, Ioana Ion, Mihai Marin, Eduard-Marius Lungulescu, Virgil Marinescu, Magdalena Aflori and Adriana Mariana Bors
Polymers 2024, 16(15), 2188; https://doi.org/10.3390/polym16152188 - 31 Jul 2024
Viewed by 991
Abstract
This research investigates novel polymeric composite materials for automotive interior trim applications. The composites utilize recycled polypropylene (PPr) matrix and carboxymethylcellulose (CMC) as filler (PPr/CMC: 100/0, 95/5, and 90/10 wt.%). The materials were processed by extrusion and injection molding. Considering their intended application, [...] Read more.
This research investigates novel polymeric composite materials for automotive interior trim applications. The composites utilize recycled polypropylene (PPr) matrix and carboxymethylcellulose (CMC) as filler (PPr/CMC: 100/0, 95/5, and 90/10 wt.%). The materials were processed by extrusion and injection molding. Considering their intended application, the composites were evaluated for resistance to key climatic factors, i.e., temperature, humidity, and UV radiation. In addition, structural analyses and FTIR analyses were performed to assess potential heterogeneity and thermal stability. Following FTIR tests, the incorporation of carboxymethyl cellulose in polypropylene is confirmed by the detection of characteristic CMC bands for -OH, C=O, and C-O-C groups. The results indicate slight structural heterogeneity in the 5% and 10% CMC composites. However, no thermal distortions were observed in either the composites or the PPr matrix itself. The behavior of PPr/CMC composites under the action of the mentioned climatic factors has been assessed from the variation of dielectric characteristics with frequency. The strong polarization of CMC leads to a sharp increase in composites electrical conductivity after submersion in water for 480 h, suggesting weakening of the composite structure. After exposure to UV radiation, a sharp increase in conductivity is observed even after the first cycle (72 h) of UV radiation. Following the experimental results obtained in our study, it is recommended to use the PPr +10% CMC composite for obtaining different interior ornaments (carpets, supports, etc.). At the same time, the use of these materials also has the advantage of lightening the mass of the vehicle due to their lower density than polymers. Full article
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