scholarly journals Carbon fiber skeleton/silver nanowires composites with tunable negative permittivity behavior

2021 ◽  
Vol 8 ◽  
pp. 1
Author(s):  
Yan An ◽  
Jinyuan Qin ◽  
Kai Sun ◽  
Jiahong Tian ◽  
Zhongyang Wang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Composite Material ◽  
Carbon Fibers ◽  
Silver Nanowires ◽  
Negative Permittivity ◽  
Conductive Network ◽  
Impregnation Process ◽  
Absolute Value ◽  
Potential Applications ◽  
Different Content

With the development of periodic metamaterials, more attention has been paid to negative permittivity behavior due to great potential applications. In this paper, silver nanowires (AgNWs) were introduced to the porous carbon fibers (CFS) by an impregnation process to prepare CFS/AgNWs composites with different content of AgNWs and the dielectric property was investigated. With the formation of conductive network, the Drude-like negative permittivity was observed in CFS/AgNWs composites. With the increase of AgNWs, the connectivity of conductive network became enhanced, the conductivity gradually increases, and the absolute value of the negative dielectric constant also increases to 8.9 × 104, which was ascribed to the enhancement of electron density of the composite material. Further investigation revealed that the inductive characteristic was responsible for the negative permittivity.

Effect of different photoinitiators on the properties of UV-cured electromagnetic shielding composites

2015 ◽  
Vol 35 (3) ◽  
pp. 209-222 ◽  
Author(s):  
Yuting Dai ◽  
Fengxian Qiu ◽  
Lili Wang ◽  
Jinliang Zhao ◽  
Dongya Yang ◽  
...  
Keyword(s):  
Electromagnetic Shielding ◽  
Conductive Network ◽  
Surface Functional Groups ◽  
Low Resistivity ◽  
Polyurethane Acrylate ◽  
Potential Applications ◽  
Different Content ◽  
Conductive Particles ◽  
Shielding Composites ◽  
Active Diluents

Abstract A series of UV-cured electromagnetic shielding composites (UV-EMSC) containing different content of graphene oxide (GO) were prepared with oligomer, acrylate active diluents and different photoinitiators (Darocur 1173, Irgacure 184 or Irgacure 651). To fabricate conductive oligomer with low resistivity, polyurethane-acrylate (PUA) was used as the polymer matrix to help construct two-dimensional conductive networks consisting of GO. For forming conductive network structure, the surface functional groups (-OH, -COOH) of GO served as slightly conductive particles bonded with -NCO from the chain of polyurethane. The UV-EMSC exhibited a low resistivity of approximately 402 Ω·cm and an outstanding enhanced electrical conductivity of 249 mS/m at a GO content of 0.0200%. The effects of different photoinitiators on the properties of UV-cured films were investigated. The results indicate that the prepared UV-EMSC has great potential applications in different regions, such as in coatings of electronic, electrical, communications, plastic coatings and wood finishes.

Promising hybrid fabrics based on carbon and aramid fibers as a reinforcing filler for polymer composites

2019 ◽  
pp. 86-95 ◽  
Author(s):  
G. F. Zhelezina ◽  
V. G. Bova ◽  
S. I. Voinov ◽  
A. Ch. Kan
Keyword(s):  
Composite Material ◽  
Polymer Composites ◽  
Carbon Fibers ◽  
Mechanical Characteristics ◽  
High Strength ◽  
High Modulus ◽  
Hybrid Composite Material ◽  
Hybrid Fabric ◽  
Reinforcing Filler ◽  
Physical And Mechanical Characteristics

The paper considers possibilities of using a hybrid fabric made of high-modulus carbon yarn brand ZhGV and high-strength aramid yarns brand Rusar-NT for polymer composites reinforcement. The results of studies of the physical and mechanical characteristics of hybrid composite material and values of the implementation of the strength and elasticity carbon fibers and aramid module for composite material are presented. 

scholarly journals Lignin-Based Carbon Fibers: Formation, Modification and Potential Applications

2021 ◽  
Author(s):  
Shichao Wang ◽  
Jixing Bai ◽  
Mugaanire Tendo Innocent ◽  
Qianqian Wang ◽  
Hengxue Xiang ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Potential Applications

Using Embossing to Create a Fiber Reinforced Honeycomb Composite

2005 ◽  
Vol 127 (2) ◽  
pp. 257-262 ◽  
Author(s):  
William Jordan
Keyword(s):  
Tensile Strength ◽  
Composite Material ◽  
Carbon Fibers ◽  
Flexural Modulus ◽  
Testing Machine ◽  
Charpy Impact ◽  
Tensile Tests ◽  
Hydraulic Testing ◽  
Charpy Impact Toughness ◽  
Bend Tests

This research project used hot embossing to create a strong and tough polymeric based composite structure. A honeycomb type structure was created by pressing small grooves into thin polycarbonate sheets. A trapezoidal die was used to create hexagonal shaped channels in the polymeric sheet. A number of these sheets were then bonded together to form a composite material. Carbon fibers were embedded into the channels in some of the laminates. The embossing process was carried out at an elevated temperature in an environmental chamber attached to an MTS servo hydraulic testing machine. The grooved structure had a 31% to 45% decrease in the apparent density compared to the ungrooved specimens. Bend tests, tensile tests, and Charpy impact tests were performed on laminates made from this material. The specific values of tensile strength, flexural modulus, and Charpy impact toughness were increased. A small percentage of fibers significantly increased both the stiffness and strength of the laminate.

IN-SITU MEASUREMENT OF PERMEABILITY BETWEEN CARBON FIBER/RESIN

2021 ◽  
Author(s):  
MASAKI ENDO ◽  
HIROSHI SAITO ◽  
ISAO KIMPARA
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Capital Investment ◽  
High Strength ◽  
Carbon Fiber Reinforced Plastic ◽  
Manufacturing Costs ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Carbon fiber reinforced plastic (CFRP) is a composite material in which carbon fibers are impregnated with resin to achieve both high strength and high rigidity. CFRP is an excellent material, but it is expensive in terms of materials, manufacturing costs, and capital investment, and it takes a lot of time to complete a product. In order to solve these problems, the demand for de-autoclaving has been increasing in recent years. If molding can be performed without autoclaving, it will be possible to reduce costs and improve productivity in terms of materials and capital investment costs.

scholarly journals Effect of curing age on the self-sensing behavior of carbon-based engineered cementitious composites (ECC) under monotonic flexural loading scenario

2018 ◽  
Vol 162 ◽  
pp. 01034
Author(s):  
Ali Majeed Al-Dahawi
Keyword(s):  
Carbon Fibers ◽  
The Self ◽  
Cementitious Composites ◽  
Conductive Network ◽  
Engineered Cementitious Composites ◽  
Electrically Conductive ◽  
Conductive Material ◽  
Flexural Loading ◽  
Curing Age ◽  
Carbon Based

The potential effects of curing age on the self-sensing (piezoresistivity) capability of carbon-based Engineered Cementitious Composites (ECC) specimens are under focus in the present study. This non-structural feature can be regarded as one of the best solutions for continuously monitoring of infrastructures in terms of damage and deformations. Carbon fibers which are a micro-scale electrically conductive material were added to the ECC matrix and well dispersed to create the electrically conductive network. This network is responsible for sensing the applied loads on the prismatic specimens. The self-sensing behavior of electrically conductive prismatic specimens under four-point monotonic flexural loading was investigated and compared with dielectric ECC specimens at four ages of curing (7, 28, 90 and 180 days). The results showed that the developed multifunctional cementitious composites can sense the changes in the applied flexural stresses and the resultant mid-span deflection along the adopted curing ages with an improvement in the later ages.

scholarly journals Composite Materials and Their Fiber Reinforcement Technology in Aerospace Field

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Kailin Zhou
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Research And Development ◽  
Carbon Fibers ◽  
Fiber Reinforcement ◽  
Space Structures ◽  
Advanced Composite ◽  
Advanced Composite Materials ◽  
Composites Materials ◽  
Definition Of

The need to reduce the overall weight of aeronautical and space structures while preserving or even improving their performances make the research and development in the field of advanced composite materials necessary for the advancement of aerospace technologies. This paper provides an overview of composite materials and their fiber reinforcement technology in aerospace field. We discuss the reasons for aircraft manufacturers and airlines to use composites and illustrate the definition of composite material. Then, we list the advantages and disadvantage of composite materials and cite different fiber reinforcement technologies of carbon fibers, aramid fiber, UHMWPE, etc. At last, we summarize the present and future applications of composites materials in aerospace and other civil fields. A conclusion is drawn that in the future, composite materials are set for their development, while continually decreasing its costs is still an important task.

Experimental Investigation and Finite Element Simulation of Fracture Process of Polymer Composite Material with Short Carbon Fibers

2015 ◽  
Vol 725-726 ◽  
pp. 943-948 ◽  
Author(s):  
Ivan Maniak ◽  
Boris Melnikov ◽  
Artem S. Semenov ◽  
Sergey Saikin
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Finite Element Simulation ◽  
Polymer Composite ◽  
Carbon Fibers ◽  
Strength Properties ◽  
Polymer Composite Material ◽  
Tension Tests ◽  
Element Simulation ◽  
Short Carbon

This work is devoted to the research of mechanical and strength properties of polymer composite material with short carbon fibers produced by injection molding technology. The material is PEEK90HMF20 with 20 % of carbon fibers mass fraction and based on polyether ether ketone (PEEK) polymer matrix. Mechanical and strength properties were researched on samples that had been cut from molded plates. A set of tension tests was performed and stress-strain diagrams of samples with different orientation in relation to the global direction of injection were obtained. Two-step homogenization procedure and pseudo-grains failure model were used to describe composite material behavior. The material model parameters were calibrated with experimental data by means of reverse-engineering procedure. Finite element simulation of tension tests was performed to check the quality of built model from the point of view of its ability to predict failure.

Novel Sandwich Composite with Recycled Multilayer Carton Core and Aluminum Facings

2014 ◽  
Vol 1611 ◽  
pp. 7-12
Author(s):  
J.G. Carrillo ◽  
J.A. Moo-Tec ◽  
R.A. Gamboa
Keyword(s):  
Composite Material ◽  
Maleic Anhydride ◽  
Particulate Composite ◽  
Sandwich Composite ◽  
Building Facades ◽  
Potential Applications ◽  
Urban Solid Waste ◽  
Testing Standards ◽  
Particulate Composite Material ◽  
Recycled Material

ABSTRACTIn the present study a new sandwich laminate is designed and mechanically characterized. The laminate is elaborated with a core of particulate composite material consisting of recycled material from milk and juice cartons (multilayer laminate of Tetra Brik®), and HDPE containers from Urban Solid Waste (USW). The elaborated material consists of aluminum facings with a particulate core, consolidated with a thermoplastic adhesive of polypropylene- maleic anhydride. The main properties under tension are evaluated under testing standards. Results show good compatibility in the union of elements, with potential applications in building facades and false walls for the construction and furnishing industries.

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