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Polymers
Special Issues
Fiber-Reinforced Polymer-Based Composites: Processing, Characterization and Performance II
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Fiber-Reinforced Polymer-Based Composites: Processing, Characterization and Performance II

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

Deadline for manuscript submissions: closed (25 March 2023) | Viewed by 8569

Special Issue Editors

Prof. Dr. Jean-François Gérard

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Guest Editor
Laboratoire Ingénierie des Matériaux Polymères, CNRS UMR 5223, INSA Lyon, 69100 Villeurbanne, France
Interests: chemical-physic of interfaces; polymer adhesion; nanostructured materials; polymer-based composite
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jannick Duchet-Rumeau

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Guest Editor
Laboratoire Ingénierie des Matériaux Polymères (UMR 5223), INSA Lyon, 69100 Villeurbanne, France
Interests: processing of nanocomposites materials; processing of mesoporous materials with the use of carbon dioxide in supercritical medium as a foaming agent; processing of self-assembled materials onto inorganic surfaces with the use of phase separation phenomena in polymer blends and of self-organization phenomena (nanolithography, optical properties, etc.); processing of nanomaterials from ionic liquids; tailoring of interfaces/interphases in heterogeneous materials: polymer blends and fiber based composites
Special Issues, Collections and Topics in MDPI journals
Dr. Frederic Lortie

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Guest Editor
Laboratoire Ingénierie des Matériaux Polymères, CNRS UMR 5223, INSA Lyon, 69100 Villeurbanne, France
Interests: thermosets chemical-physic; chemorheology; reactive processing; polymer-based composite
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Fiber-reinforced polymer-based composites constitute an important class of materials for semi-structural or structural applications in numerous industrial sectors (transport, energy, civil engineering, sport, etc.). Historically involved organic matrices are thermosets (such as epoxies, unsaturated polyesters, phenolics, and bismaleimides), but more recent efforts have focused on the development of performant thermoplastic-based composites (such as acrylics, polyamides, PEEK, and PEKK). Reinforcement is brought on by short or continuous fibers which can be of various natures (glass, basalt, carbon, hemp, etc.) and may be combined as hybrid fabrics.

There is still room for improvement in polymer-based composites’ performances, for instance, in terms of damage tolerance or to include additional functionalities such as electrical conductivity. The processing and assembly of dissimilar composites (e.g., thermoset/thermoplastic) is also a key challenge.

Progress can be achieved on the organic matrix through new petroleum- or bio-based chemistries, the introduction of inorganic/organic particles or the design of multiphasic materials. The polymer/fiber interphase is also a key component to be investigated and improved: composite performances are strongly conditioned by interfacial adhesion and toughness, which depend on fiber sizing chemistry and physics, on interphase chemical composition, as well as on fiber impregnation quality. Processing steps must also be optimized in terms of efficiency and quality by designing new unreactive or reactive routes, and new semi-products and processing tools.

In this Special Issue dedicated to “Fiber-Reinforced Polymer-Based Composites: Processing, Characterization and Performance II”, we kindly invite you to submit scientific contributions which report on recent progresses in the field described above.

Prof. Dr. Jean-François Gérard
Prof. Dr. Jannick Duchet-Rumeau
Dr. Frederic Lortie
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

  • thermoset-based composite
  • thermoplastic-based composite
  • dissimilar composite
  • composite processing
  • reactive processing
  • fiber sizing
  • polymer–fiber interphase

Published Papers (5 papers)

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13 pages, 5906 KiB  
Article
Effect of Scarf Repair Geometry on the Impact Performance of Aerospace Composites
by Sridharan Vijay Shankar and Sridhar Idapalapati
Polymers 2023, 15(10), 2390; https://doi.org/10.3390/polym15102390 - 20 May 2023
Cited by 1 | Viewed by 1348
Abstract
This experimental study investigates the effect of scarf geometry in restoring the impact response of scarf-patched 3 mm thick glass-fiber reinforced polymer (GFRP) matrix composite laminates. Traditional circular along with rounded rectangular scarf patch configurations are considered repair patches. Experimental measurements revealed that [...] Read more.
This experimental study investigates the effect of scarf geometry in restoring the impact response of scarf-patched 3 mm thick glass-fiber reinforced polymer (GFRP) matrix composite laminates. Traditional circular along with rounded rectangular scarf patch configurations are considered repair patches. Experimental measurements revealed that the temporal variations of force and energy response of the pristine specimen are close to that of circular repaired specimens. The predominant failure modes were witnessed only in the repair patch which includes matrix cracking, fiber fracture, and delamination, and no discontinuity in the adhesive interface was witnessed. When compared with the pristine samples, the top ply damage size of the circular repaired specimens are larger by 9.91%, while that of the rounded rectangular repaired specimens is larger by 434.23%. The results show that circular scarf repair is a more suitable choice of repair approach under the condition of a 37 J low-velocity impact event even though the global force-time response is similar. Full article
(This article belongs to the Special Issue Fiber-Reinforced Polymer-Based Composites: Processing, Characterization and Performance II)
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19 pages, 41061 KiB  
Article
Experimental Study on Shear-Peeling Debonding Behavior of BFRP Sheet-to-Steel Interfaces
by Hanyang Xue, Dafu Cao, Zhanzhan Tang, Qing Liu, Siji Zhu, Jiaqi Liu and Chuanzhi Sun
Polymers 2023, 15(9), 2216; https://doi.org/10.3390/polym15092216 - 08 May 2023
Viewed by 1206
Abstract
In order to study the failure mode and debonding behavior of the interface between BFRP (basalt fiber reinforced polymer) sheet and structural steel under mixed-mode loading conditions, eighteen specimens with different initial angles were tested in this study. The specimens were designed with [...] Read more.
In order to study the failure mode and debonding behavior of the interface between BFRP (basalt fiber reinforced polymer) sheet and structural steel under mixed-mode loading conditions, eighteen specimens with different initial angles were tested in this study. The specimens were designed with different initial angles to ensure that the interface performed under mixed-mode loading conditions. The relations between the bond strengths, failure modes, and initial angles were investigated. A new evaluation method to predict the interfacial bond strength under shear-peeling loading mode was proposed. The test results show that specimens with a smaller initial angle are more likely to exhibit a shear debonding failure at the interface between the steel plate and adhesive. In contrast, specimens with a larger initial angle are more likely to exhibit peeling of the interface. The ultimate tensile strength of the specimen is higher with a smaller initial angle. The results predicted by the proposed method are in good agreement with the experimental results. Full article
(This article belongs to the Special Issue Fiber-Reinforced Polymer-Based Composites: Processing, Characterization and Performance II)
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17 pages, 3936 KiB  
Article
Flexural Performance and End Debonding Prediction of NSM Carbon FRP-Strengthened Reinforced Concrete Beams under Different Service Temperatures
by Marta Baena, Younes Jahani, Lluís Torres, Cristina Barris and Ricardo Perera
Polymers 2023, 15(4), 851; https://doi.org/10.3390/polym15040851 - 08 Feb 2023
Cited by 5 | Viewed by 1530
Abstract
This paper aims to evaluate the influence of relatively high service temperatures (near or beyond the glass transition temperature (Tg) of epoxy adhesive) on the flexural performance and end debonding phenomenon in near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP)-strengthened, reinforced [...] Read more.
This paper aims to evaluate the influence of relatively high service temperatures (near or beyond the glass transition temperature (Tg) of epoxy adhesive) on the flexural performance and end debonding phenomenon in near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP)-strengthened, reinforced concrete (RC) beams. To this end, an experimental program consisting of 24 beams (divided into four groups) was performed, where different parameters was combined (i.e., service temperature, steel reinforcement ratio, CFRP ratio, and concrete compressive strength). In addition, the effect of the testing temperature on the end debonding phenomenon was investigated with an analytical procedure according to fib Bulletin 90, and the predictions were compared to experimental results. Taking specimens tested at 20 °C as a reference, no considerable change was observed in the ultimate load of the specimens tested below 60 °C (being in the range of epoxy Tg), and all specimens failed by FRP rupture. On the other hand, the increase in testing temperature up to 70 and 85 °C was followed by a decrease in the capacity of the strengthened beams and a change in failure mode, moving from FRP rupture to end debonding and concrete crushing. The analytical procedure successfully predicted the occurrence of premature end debonding failure and demonstrated that the effect of temperature on the mechanical properties of materials can be a key factor when predicting the premature end debonding in a NSM joint. Full article
(This article belongs to the Special Issue Fiber-Reinforced Polymer-Based Composites: Processing, Characterization and Performance II)
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11 pages, 2229 KiB  
Article
Multi Response Optimization of ECDM Process for Generating Micro Holes in CFRP Composite Using TOPSIS Methodology
by Manpreet Singh, Sarbjit Singh, Jatinder Kaur Arora, Parvesh Antil, Ankit D. Oza, Dumitru Doru Burduhos-Nergis and Diana Petronela Burduhos-Nergis
Polymers 2022, 14(23), 5291; https://doi.org/10.3390/polym14235291 - 03 Dec 2022
Cited by 9 | Viewed by 1688
Abstract
The applications of carbon fiber reinforced polymer composites (CFRPCs) in aerospace, automotive, electronics and lab-on-chip devices require precise machining processes. Over the past decade, there have been numerous attempts to machine CFRPCs using both traditional and unconventional machining techniques. However, because of their [...] Read more.
The applications of carbon fiber reinforced polymer composites (CFRPCs) in aerospace, automotive, electronics and lab-on-chip devices require precise machining processes. Over the past decade, there have been numerous attempts to machine CFRPCs using both traditional and unconventional machining techniques. However, because of their limitations, these methods have not gained widespread acceptance. In the present research investigation, Electrochemical Discharge Machining (ECDM) process has been employed to produce micro-holes on CFRPC. The experimental strategy was scheduled using L9 orthogonal array keeping applied voltage, electrolyte concentration and inter-electrode gap as input parameters. The material removal rate (MRR) and overcut were selected as output parameters. The technique for order preference by similarity to the ideal solution (TOPSIS) methodology was executed for multi-response optimization. The overcut and MRR of machined samples improved from 150 µm to 48 µm and 2.232 mg/min to 2.1267 mg/min correspondingly while using the optimum parametric settings of the TOPSIS approach. The shape of drilled micro-holes produced by the TOPSIS process is indicative of a machined surface of superior quality, with a reduction in the number of micro-cracks and a diameter that is uniform. Full article
(This article belongs to the Special Issue Fiber-Reinforced Polymer-Based Composites: Processing, Characterization and Performance II)
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17 pages, 6391 KiB  
Article
Enhancing Thermal Conductivity of Polyvinylidene Fluoride Composites by Carbon Fiber: Length Effect of the Filler
by Guoqing Yi, Jingliang Li, Luke C. Henderson, Weiwei Lei, Lian Du and Shuaifei Zhao
Polymers 2022, 14(21), 4599; https://doi.org/10.3390/polym14214599 - 29 Oct 2022
Cited by 10 | Viewed by 2252
Abstract
Thermally conductive polyvinylidene fluoride (PVDF) composites were prepared by incorporating carbon fibers (CFs) with different lengths (286.6 ± 7.1 and 150.0 ± 2.3 µm) via cold pressing, followed by sintering. The length effects of the CF on the thermal conductivity, polymer crystallization behaviors, [...] Read more.
Thermally conductive polyvinylidene fluoride (PVDF) composites were prepared by incorporating carbon fibers (CFs) with different lengths (286.6 ± 7.1 and 150.0 ± 2.3 µm) via cold pressing, followed by sintering. The length effects of the CF on the thermal conductivity, polymer crystallization behaviors, and mechanical properties of the PVDF composites were studied. The through-plane thermal conductivity of the PVDF composites increased significantly with the rise in CF loadings. The highest thermal conductivity of 2.89 W/(m∙K) was achieved for the PVDF composites containing 40 wt.% shorter CFs, ~17 times higher than that of the pure PVDF (~0.17 W/(m∙K)). The shorter CFs had more pronounced thermal conductive enhancement effects than the original longer CFs at higher filler loadings. CFs increased the storage modulus and the glass transition temperature of the PVDF. This work provides a new way to develop thermally conductive, mechanically, and chemically stable polymer composites by introducing CFs with different lengths. Full article
(This article belongs to the Special Issue Fiber-Reinforced Polymer-Based Composites: Processing, Characterization and Performance II)
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