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Polymers
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Polymer Fiber and Nanowire Reinforced Materials
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Polymer Fiber and Nanowire Reinforced Materials

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

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 13374

Special Issue Editors

Dr. Rajab Abousnina

E-Mail Website
Guest Editor
School of Engineering, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia
Interests: composite materials; waste materials; geopolymer concrete; concrete technology
Dr. Benchaa Benabed

E-Mail Website
Co-Guest Editor
Civil Engineering Research Laboratory (LRGC), University of Laghouat, Laghouat, Algeria
Interests: Strengthening of masonry walls with CFRP composite: experiments and numerical modelling, Use of Industrial by- Products in Cement-Based Materials, Self-Compacting Concrete made with Waste Materials (CRT funnel glass), Durability of concrete and Concrete Repair.
Special Issues, Collections and Topics in MDPI journals
Dr. Khouloud Jlassi

E-Mail Website
Co-Guest Editor
Centre for Advanced Materials, Qatar University, Doha 2713, Qatar
Interests: composite materials; waste materials; geopolymer concrete; concrete technology

Special Issue Information

Dear Colleagues,

Nanocomposites are defined as multiphase materials in which at least one of the constituents has a nanometre dimension. Nanowires created from polymers have been used as reinforcing agents in conducting polymers and non-conducting thermoplastics and thermosets, such as polypyrene, polyaniline, polythiophene, polyurethane, acrylic polymers, polystyrene, epoxy, and rubber. Polymer/nanowire nanocomposites have the ability to affect stiffness, strength, electrical conductivity, thermal, piezoelectric and photovoltaic properties at low nanofiller loading levels.   This Special Issue covers a variety of aspects of nanowires as reinforced materials, including the influence of polymer matrix and nanowires on nanocomposite characteristics. Materials characterisation, dynamic mechanical properties, and microstructural characterisation of polymer fibres and nanowire-reinforced materials are possible topics. Additionally, this issue will accept reviews on polymer fibres and nanowire-reinforced materials.

Dr. Rajab Abousnina
Dr. Benchaa Benabed
Dr. Khouloud Jlassi
Guest Editors

Manuscript Submission Information

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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

  • polymer fiber and nanowire reinforced materials
  • microstructure characterization of composites
  • application of polymer fiber and nanowire
  • dynamic mechanical properties of composites
  • state-of-the-art reviews on polymer fiber and nanowire reinforced materials

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Published Papers (5 papers)

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Research

15 pages, 22816 KiB  
Article
Mechanical and Shape Recovery Characterization of MWCNTs/HNTs-Reinforced Thermal-Responsive Shape-Memory Polymer Nanocomposites
by Sivanagaraju Namathoti and Manikanta Ravindra Kumar Vakkalagadda
Polymers 2023, 15(3), 710; https://doi.org/10.3390/polym15030710 - 31 Jan 2023
Cited by 19 | Viewed by 2407
Abstract
Mechanical and shape recovery characteristics of thermal-responsive shape-memory polyurethane (SMPU) reinforced with two types of reinforcements, multiwalled carbon nanotubes (MWCNTs) and halloysite nanotubes (HNTs), were studied in the present research work. Three weight percentages of reinforcement (0, 0.5 and 1%) in the SMPU [...] Read more.
Mechanical and shape recovery characteristics of thermal-responsive shape-memory polyurethane (SMPU) reinforced with two types of reinforcements, multiwalled carbon nanotubes (MWCNTs) and halloysite nanotubes (HNTs), were studied in the present research work. Three weight percentages of reinforcement (0, 0.5 and 1%) in the SMPU matrix were considered, and the required composite specimens were obtained through injection moulding. Tensile, flexural, impact and shape recovery behaviours were studied experimentally. Further, flexural tests were performed for multiple cycles to understand the specimens’ flexural strength variation after shape recovery. The concentration of both reinforcements (MWCNTs and HNTs) considered in the present study significantly improved mechanical properties and shape recovery. Full article
(This article belongs to the Special Issue Polymer Fiber and Nanowire Reinforced Materials)
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15 pages, 8245 KiB  
Article
Limited Optimal Plastic Behavior of RC Beams Strengthened by Carbon Fiber Polymers Using Reliability-Based Design
by Sarah Khaleel Ibrahim and Majid Movahedi Rad
Polymers 2023, 15(3), 569; https://doi.org/10.3390/polym15030569 - 22 Jan 2023
Cited by 30 | Viewed by 2088
Abstract
The plastic behavior of strengthened haunched beams utilizing carbon fiber-reinforced polymers (CFRP) was investigated using a probabilistic design that took into account random concrete properties, CFRP properties, and complementary strain energy values, with the reliability index serving as a limiting index, as the [...] Read more.
The plastic behavior of strengthened haunched beams utilizing carbon fiber-reinforced polymers (CFRP) was investigated using a probabilistic design that took into account random concrete properties, CFRP properties, and complementary strain energy values, with the reliability index serving as a limiting index, as the proposed method considers a novel method that deals with probabilistic parameters for models with limited plastic behavior designed based on the reliability index. The data used in this research were gathered and evaluated in a recent study on simply supported haunched beams reinforced with carbon fiber-reinforced polymers. The purpose of this research was to use the reliability limitation index for simulated strengthened haunched beams by taking into account randomness in concrete and CFRP properties and the complementary strain energy value, which is considered a plastic behavior controller that provides an illustration of the damage amount within the reinforcement steel bars. The results indicate how randomness affects the behavior of the presented models, which are chosen to have different numbers of CFRP strips. The variable randomness affects load and deflection values where the reliability index value increases as the corresponding load value decrease, reflecting the increased probability of failure in models subjected to higher loading conditions, while tension concrete damage percentages are reflected in the damage pattern presented in the results, showing that as the produced load increases, so does the damage intensity. It is also obvious that the reliability index served as a limitation index while taking concrete characteristics and complementary strain energy as random variables. Full article
(This article belongs to the Special Issue Polymer Fiber and Nanowire Reinforced Materials)
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13 pages, 5874 KiB  
Article
The Electric–Thermal Effect of a Carbon-Fibre-Reinforced Epoxy Composite and Its Corresponding Mechanical Properties
by Runtian Zhu, Guoxian Wang, Yuebin Lin, Jinxi Long, Longji Du, Xusheng Du, Rajab Abousnina and T. Tafsirojjaman
Polymers 2022, 14(21), 4489; https://doi.org/10.3390/polym14214489 - 24 Oct 2022
Cited by 3 | Viewed by 2047
Abstract
In this work, the electric–thermal effect of a carbon-fibre-reinforced epoxy composite (CFRE) panel was studied, as well as the influence of the electric heating treatment on the mechanical properties of the composite. It was observed that the temperature of the composite increased rapidly [...] Read more.
In this work, the electric–thermal effect of a carbon-fibre-reinforced epoxy composite (CFRE) panel was studied, as well as the influence of the electric heating treatment on the mechanical properties of the composite. It was observed that the temperature of the composite increased rapidly once the current was loaded, and the equilibrium surface temperature was reached within 2 min. The electric–thermal effect and mechanical properties depended on both the current loading time and the current intensity. At 5A, the flexural modulus and strength of the CFRE increased before decreasing with the current loading time. Under the same treatment time, the flexural strength of the samples treated with 5A was evidently larger than that under the small current, and all the treated samples displayed enhanced flexural strength compared to that of untreated samples. The results depicted that the low-current treatment and short time could improve the interfacial properties between CF/epoxy, along with enhancing the flexural properties of the samples. However, a large amount of the joule heating from the larger current and a more extensive time frame is predicted to cause irreversible defects to the composite, which consequently leads to the reduction in flexural strength of the composite. TGA results indicated decreased thermal stability of the CFRE composite panels after the electric heating treatment was applied. Full article
(This article belongs to the Special Issue Polymer Fiber and Nanowire Reinforced Materials)
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23 pages, 9872 KiB  
Article
Theoretical Study of the Effect of Fibre Porosity on the Heat Conductivity of Reinforced Gypsum Composite Material
by A. Shalwan, Abdalrahman Alajmi and B. F. Yousif
Polymers 2022, 14(19), 3973; https://doi.org/10.3390/polym14193973 - 23 Sep 2022
Cited by 8 | Viewed by 2971
Abstract
In recent years, there has been an increasing demand for engineering materials that possess good mechanical and thermal properties and are cheap an d environmentally friendly. From an industrial and academic point of view, there is a need to study the heat conductivity [...] Read more.
In recent years, there has been an increasing demand for engineering materials that possess good mechanical and thermal properties and are cheap an d environmentally friendly. From an industrial and academic point of view, there is a need to study the heat conductivity of newly developed polymer composites and the influence of porosity on the insulation performance of polymer composites. Experimental and theoretical studies were conducted on mainly sisal/glass fibre gypsum composites with different fibre volumes (0, 20, 25, 30, and 35 wt.%). The outcomes from the theoretical model in ANSYS have shown that there is a high possibility to simulate the experimental work and high accuracy for reflecting the experimental findings. Moreover, the results show that natural fibre polymer composites with a high-volume fraction of natural fibres have higher insulation performance than synthetic polymer composites with the same volume fraction of synthetic fibres. Furthermore, the results suggest and support that the improved performance of natural fibre-based composites was due at least in part to the internal porosity of the fibres. Full article
(This article belongs to the Special Issue Polymer Fiber and Nanowire Reinforced Materials)
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25 pages, 5649 KiB  
Article
Experimental Research and Numerical Analysis of CFRP Retrofitted Masonry Triplets under Shear Loading
by Houria Hernoune, Benchaa Benabed, Rajab Abousnina, Abdalrahman Alajmi, Abdullah M GH Alfadhili and Abdullah Shalwan
Polymers 2022, 14(18), 3707; https://doi.org/10.3390/polym14183707 - 6 Sep 2022
Cited by 8 | Viewed by 2706
Abstract
This paper presents an experimental and numerical study into the shear response of brick masonry triplet prisms under different levels of precompression, as well as samples reinforced with carbon fiber-reinforced polymer (CFRP) strips. Masonry triplets were constructed with two different mortar mix ratios [...] Read more.
This paper presents an experimental and numerical study into the shear response of brick masonry triplet prisms under different levels of precompression, as well as samples reinforced with carbon fiber-reinforced polymer (CFRP) strips. Masonry triplets were constructed with two different mortar mix ratios (1:1:3 and 1:1:5). In this study, finite element models for the analysis of shear triplets are developed using detailed micro-modelling (DMM) approach and validated with the experimental data. The failure mechanisms observed in the masonry triplets were simulated using a coupled XFEM-cohesive behaviour approach in ABAQUS finite element software. The nonlinear behaviour of mortar and brick was simulated using the concrete damaged plasticity (CDP) constitutive laws. The cohesive element with zero thicknesses was employed to simulate the behaviour of the unit–mortar interfaces. The extended finite element method (XFEM) was employed to simulate the crack propagation in the mortar layer without an initial definition of crack location. CFRP strips were simulated by 3D shell elements and connected to masonry elements by an interface model. The changes in failure mechanism and shear strength are calculated for varying types of mortar and fiber orientation of CFRP composite. Based on this study, it was concluded that the ultimate shear strength of masonry triplets is increased due to the external bonding of CFRP strips. The performance of masonry specimens strengthened with CFRP strips is assessed in terms of gain in shear strength and post-peak behaviour for all configurations and types of mortar considered. The comparison of FE and experimental results proved that the models have the potential to be used in practice to accurately predict the shear strength and reflect damage progression in unreinforced and CFRP-reinforced masonry triplets under in-plane loading, including the debonding of the CFRP reinforcement. Additionally, XFEM was found to be a powerful technique to be used for the location of crack initiation and crack propagation in the mortar layer. Full article
(This article belongs to the Special Issue Polymer Fiber and Nanowire Reinforced Materials)
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