Communication—A Technique for Online Continuous Manufacture of Carbon Nanotubes-Grown Carbon Fibers

2019 ◽  
Vol 8 (3) ◽  
pp. M23-M25 ◽  
Author(s):  
Jianjie Qin ◽  
Chengguo Wang ◽  
Yanxiang Wang ◽  
Shunsheng Su ◽  
Ruijiao Lu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fibers ◽  
Continuous Manufacture

THE STRENGTH OF NANOCOMPOSITES POLYMER / 2D-NANOFILLER WITH ULTRASMALL FILLER CONTENTS

2020 ◽  
pp. 3-6
Author(s):  
Gasan M. Magomedov ◽  
Guseyn M. Magomedov ◽  
I. V. Dolbin
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fibers ◽  
Interfacial Adhesion ◽  
Fracture Process ◽  
Interfacial Strength ◽  
Geometrical Parameters ◽  
Correct Description ◽  
Two Phase ◽  
Small Aggregation ◽  
Appreciable Reduction

The theoretical model, using the notions of fractal analysis is proposed for description of strength of nanocomposites polymer/2D-nanofiller on the example of nanocomposites polyvinylalcohol/boron nitride. For correct description of strength of these two-phase nanomaterial the knowledge of initial characteristics of matrix polymer (stress of fracture), geometrical parameters of nanofiller and level of interfacial adhesion polymer matrix-nanofiller is necessary. The indicated level, characterizing by shear interfacial strength, was determined theoretically within the framework of fractal conception of adhesion. Its absolute values found high enough – they are comparable with this characteristic in systems polymer-carbon nanotubes and are higher essentially than in systems polymer-microfiber (glassy and carbon fibers). This factor defines high enough strength of the considered nanocomposites. The important factor for fracture process of nanomaterials is aggregation of initial platelets of nanofiller, which forms “packets” (tactoids) of such platelets. The relatively small aggregation degree of nanofiller gives appreciable reduction of strength of nanocomposites polymer/2D-nanofiller. The indicated reduction is connected with transition of 2D-nanofiller structure from exfoliated to intercalated one, i.e. from separate platelets to their tactoids.

scholarly journals Modified rule of mixtures and Halpin–Tsai model for prediction of tensile strength of micron-sized reinforced composites and Young’s modulus of multiscale reinforced composites for direct extrusion fabrication

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401878528 ◽  
Author(s):  
Zirong Luo ◽  
Xin Li ◽  
Jianzhong Shang ◽  
Hong Zhu ◽  
Delei Fang
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Carbon Fibers ◽  
Epoxy Resins ◽  
Young's Modulus ◽  
Resin Matrix ◽  
Reinforced Composites ◽  
Rule Of Mixtures ◽  
Combined Use

A modified rule of mixtures is required to account for the experimentally observed nonlinear variation of tensile strength. A modified Halpin–Tsai model was presented to predict the Young’s modulus of multiscale reinforced composites with both micron-sized and nano-sized reinforcements. In the composites, both micron-sized fillers—carbon fibers—and nano-sized fillers—rubber nanoparticles and carbon nanotubes—are added into the epoxy resin matrix. Carbon fibers can help epoxy resins increase both the tensile strength and Young’s modulus, while rubber nanoparticles and carbon nanotubes can improve the toughness without sacrificing other properties. Mechanical experiments and scanning electron microscopy observations were used to study the effects of the micron-sized and nano-sized reinforcements and their combination on tensile and toughness properties of the composites. The results showed that the combined use of multiscale reinforcements had synergetic effects on both the strength and the toughness of the composites.

Structure and electrochemical properties of activated polyacrylonitrile based carbon fibers containing carbon nanotubes

2008 ◽  
Vol 185 (2) ◽  
pp. 676-684 ◽  
Author(s):  
Sudhakar Jagannathan ◽  
Han Gi Chae ◽  
Rahul Jain ◽  
Satish Kumar
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Properties ◽  
Carbon Fibers

Microwave Absorbing Properties of Radar Absorbing Structure Composites Filling with Carbon Nanotubes

2011 ◽  
Vol 328-330 ◽  
pp. 1109-1112 ◽  
Author(s):  
Zheng Quan Zhang ◽  
Li Ge Wang ◽  
En Ze Wang
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Wave ◽  
Carbon Fibers ◽  
Electromagnetic Waves ◽  
Glass Fibers ◽  
Network Analyzer ◽  
Microwave Absorbing Properties ◽  
Radar Absorbing Structure ◽  
Lossy Materials ◽  
Wave Properties

Radar absorbing structures (RAS) can’t only load bearing but also absorb electromagnetic wave energy by inducing dielectric loss and minimizing reflected electromagnetic waves. Therefore, the development of the RAS haves become important to reduce RCS of the object. These composites possess excellent specific stiffness and strength. The electromagnetic wave properties of RAS can be effectively tailored by controlling the content of the lossy materials. Radar absorbing structures composed of glass fibers, carbon fibers and epoxy resin filling with carbon nanotubes (CNTs), was designed and prepared. Permittivity of the composite was measured by using a network analyzer, HP8510B. The contents of composites were observed to be different from each composite. Reflection of electromagnetic waves energy of RAS was calculated by using the genetic algorithm, it was discovered that the composites can be applied to design an optional RAS composites filling with CNTs.

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