Investigation of the Process of Finishing of Carbon Fibers of Various Brands with Oligomers and Polymers of Various Chemical Structures

2019 ◽  
Vol 816 ◽  
pp. 27-32
Author(s):  
Aues A. Beev ◽  
S.Yu. Khashirova ◽  
V.A. Guchinov ◽  
D.A. Beeva ◽  
M.V. Makoeva ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Chemical Activation ◽  
Coupling Agents ◽  
Chemical Structures ◽  
Polymeric Nature ◽  
Scanning Electron

The article presents the results of work on the dressing of various continuous carbon fibers of a different structure with compounds of oligomeric and polymeric nature. Using gravimetry, optical and scanning electron microscopy methods, it was shown that the fixation of sizing substances on the surface of carbon fibers depends on the brand of carbon fiber, the method of chemical activation and the nature of the sizing agent. It has been shown that the studied coupling agents exhibit increased adhesion to carbon fiber of the brand TGN-2.

scholarly journals Wettability of Copper Coated Carbon Fibers

1994 ◽  
Vol 3 (4) ◽  
pp. 096369359400300
Author(s):  
G. Carotenuto ◽  
A. Gallo ◽  
L. Nicolais
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Solid Surface ◽  
Fiber Surface ◽  
Wetting Kinetics ◽  
Coated Carbon ◽  
Kinetics Of ◽  
Scanning Electron

The wetting kinetics of a solid surface by a molten metal decrease with increase of its roughness. The topography of the growing copper coating, produced on carbon fiber surface by electroplating from a sulphat bath, has been studied by scanning electron microscopy. The smoothes surface is produced after 200÷300 milliampere-hour of plating.

High-resolution scanning electron microscopy of carbon fiber

1989 ◽  
Vol 47 ◽  
pp. 704-705
Author(s):  
Deborah L. Vezie
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Carbon Fiber ◽  
Field Emission ◽  
Carbon Fibers ◽  
Low Voltage ◽  
Electron Gun ◽  
Scanning Electron

As part of an extensive study of polyacrylonitrile (PAN) and mesophase pitch-based carbon fibers, high resolution scanning electron microscopy (HRSEM) is shown to provide additional insight into understanding and modelling microstructural origins of mechanical properties of carbon fiber. Although carbon fiber has been studied extensively, no sufficiently clear relationship between structure and mechanical properties such as elastic modulus and compressive strength has yet been developed from quantitative TEM and WAXS investigations.In this study, HRSEM data of selected carbon fibers is used to illustrate the power of HRSEM to elucidate structural differences likely accounting for changes in mechanical properties not sensitively probed either by TEM or WAXS. The three-dimensional nature of SEM imaging with accompanying high resolution permits a clearer visualization and more detailed examination of regional structures within carbon fiber over two-dimensional TEM and globally averaged WAXS data.The design of the high resolution, field emission SEM permits low voltage imaging of poorly conducting samples with resolution an order of magnitude greater than a conventional tungsten hairpin filament SEM under the same operating voltage and sample preparation conditions. Although carbon fiber is a relatively conductive material, charging effects can be seen in uncoated PAN fibers above 3.0 keV in a conventional SEM. Lower accelerating voltages are necessary for uncoated imaging of these fibers, but become impractical due to degradation of conventional SEM performance at these voltages. Uncoated sample imaging is preferred to prevent conventional evaporation or sputter coating techniques from obscuring or altering the sample surface, although charging effects may then be a problem. The high resolution, field emission SEM solves these competing voltage/ charging/ resolution issues for poorly conducting materials with the very nature of its design; the high brightness of the electron gun at low voltage coupled with the “in lens” sample placement and above the objective lens detector dramatically improve the resolution of these instruments, especially at low voltage.

scholarly journals Synthesis, Characterization and Properties of Antibacterial Polyurethanes

Polymers ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 213
Author(s):  
Jihua Duan ◽  
Guichang Jiang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Gray Mold ◽  
Proton Nuclear Magnetic Resonance ◽  
Step Method ◽  
Chemical Structures ◽  
Physically Crosslinked ◽  
Scanning Electron

Novel physically crosslinked polyurethane (PUII), based on isophorone diisocyanates, was prepared by a conventional two-step method. The chemical structures of the PUII were characterized by fourier transform infrared (FTIR), proton nuclear magnetic resonance (1H NMR), gel permeation chromatography (GPC), scanning electron microscopy (SEM) and DSC. The PUII hydrogels were subjected to solvent-induced self-assembly in THF + water to construct a variety of morphologies. The self-assembly morphology of the PUII was observed by scanning electron microscopy (SEM). The PUII films with different amounts (0.2%, 0.4%, 0.6%, 0.8%, 1.0%) of 1,3,5-Tris(2-hydroxyethyl)hexahydro-1,3,5-triazine (TNO) were challenged with Escherichia coli, Staphylococcus aureus, Bacillus subtilis and Gray mold. The results showed that when a small amount of antibacterial agent were added, the antibacterial effect of films on Botrytis cinerea was more obvious. The mechanical evaluation shows that the antimicrobial polyurethane films exhibit good mechanical properties.

A study of hydrogenated carbon fibers by scanning electron microscopy and confocal laser scanning microscopy

2009 ◽  
Vol 72 (6) ◽  
pp. 447-453
Author(s):  
Antonio Madroñero De La Cal ◽  
Juan Aguado-Serrano ◽  
Maria Luisa Rojas-Cervantes ◽  
Elena V. Rosa Adame ◽  
Belen Sarmiento Marron ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Confocal Laser Scanning Microscopy ◽  
Carbon Fibers ◽  
Laser Scanning ◽  
Laser Scanning Microscopy ◽  
Confocal Laser Scanning ◽  
Scanning Microscopy ◽  
Confocal Laser ◽  
Scanning Electron

SEM and AFM Studies on the Surface and Cross Section Morphology of Rayon-Based Activated Carbon Fibers

2011 ◽  
Vol 689 ◽  
pp. 413-418 ◽  
Author(s):  
Guang Xue Wang ◽  
Hao Han ◽  
Li Wei Li ◽  
Hai Yu Quan ◽  
Yan Ping Shi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Activated Carbon ◽  
Cross Section ◽  
Carbon Fibers ◽  
Activated Carbon Fibers ◽  
Force Microscopy ◽  
Atomic Force ◽  
External Section ◽  
Scanning Electron

The surface and cross section morphology of rayon-based carbon fibers (RCF) and the resulting rayon-based activated carbon fibers (RACF) were investigated through scanning electron microscopy and atomic force microscopy. It was found that the surface of RCF exhibited grooves and striations with the width ranging from 30 to 90 nm, and the striation distribution was about 25 bars per µm around the circumference. While on the RACF, lots of pores emerged on the surface and superficial cross section (about 1 ~ 2 µm to the surface), namely, the external section was porosity but the interior section was close-grained. It was detected that the pore sizes ranged from 50 to 550 nm and the approximate pore distribution was 10 pores in 1×1 µm2. Furthermore, the walls of pores were not smooth but consisted of continuous grains with the diameters about 30 nm.

Effect of Concentrated ENR on ENR/Si Masterbatch

2013 ◽  
Vol 832 ◽  
pp. 832-837
Author(s):  
Azira Abd. Aziz ◽  
Nurul Suhaira Abdullah ◽  
Manroshan Singh Jaswan ◽  
Singh Mustapha Kamal ◽  
Mazlina Mustapha Kamal
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Chemical Modification ◽  
Rubber Matrix ◽  
Coupling Agents ◽  
Processing Industry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Scanning Electron

This paper discusses the improvement of properties of ENR/Si composites by using concentrated ENR without using any chemical modification on the silica or latex. The composite showed a stronger reinforcing ability without addition of coupling agents. The ENR matrix reinforced the rubber by increasing the compatibility between rubber matrix and silica. Scanning electron microscopy and atomic force microscopy were performed to study the composites topology. The importance of this study is to prepare masterbatch containing ENR reinforced with Si for tyre processing industry. This masterbatch can be use directly for tyre processing compared to the conventional method.

Studies on Properties of the Coconut Carbon Fiber and Yarn

2012 ◽  
Vol 503-504 ◽  
pp. 1137-1141
Author(s):  
Jia Guang Meng ◽  
Meng Meng Guo ◽  
Ya Hong Han
Keyword(s):  
Electron Microscopy ◽  
Health Care ◽  
Scanning Electron Microscopy ◽  
Carbon Fiber ◽  
Moisture Content ◽  
Infrared Spectrum ◽  
Performance Testing ◽  
Alkali Resistance ◽  
Acid And Alkali Resistance ◽  
Scanning Electron

A new health care fiber-coconut carbon fiber, and yarn use coconut carbon fiber and cotton blended into are introduced in this paper. And a series of performance testing and analysis about scanning electron microscopy, infrared spectrum, strength, hairiness, moisture content and acid and alkali resistance are done to the carbon fiber and coconut yam.

Observation on Single Fiber Pull-Out Testing of Carbon Fiber Concrete with Scanning Electron Microscopy

2014 ◽  
Vol 711 ◽  
pp. 434-437
Author(s):  
Jing Wu ◽  
Ai Qin Xu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carbon Fiber ◽  
Single Fiber ◽  
Fiber Fracture ◽  
Pull Out ◽  
Destruction Mechanism ◽  
Fiber Concrete ◽  
Interfacial Strain ◽  
Scanning Electron

The destruction mechanism of carbon fiber cement was studied by Scanning Electron Microscopy with single fiber pull-out testing. The result showed that the interfacial strain increasing is accompanied with fiber pull-out, fiber fracture and interfacial debonding, which provides a basis for the analysis of numerical simulation.

4-Aminobenzoic Acid Functionalized PAN-Base Carbon Fibers in Mild Polyphosphoric Acid/Phosphorous Pentoxide

2011 ◽  
Vol 332-334 ◽  
pp. 219-222 ◽  
Author(s):  
Yong Tan ◽  
Hua Zhang ◽  
Hai Hui Liu ◽  
Li Chen Hou ◽  
Yan Mei Jin ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carbon Fibers ◽  
Polyphosphoric Acid ◽  
Reaction Medium ◽  
Aminobenzoic Acid ◽  
Phosphorous Pentoxide ◽  
Amine Functionalized ◽  
Pre Treatment ◽  
Scanning Electron

Pristine polyacrylonitrile (PAN)-base carbon fibers (P-CFs) was functionalized with 4-Aminobenzoic acid via ‘‘direct’’ Friedel-Crafts acylation in a mild reaction medium of polyphosphoric acid (PPA)/phosphorous pentoxid (P2O5). Fourier transform infrared spectroscopy, Raman spectroscopy, Scanning electron microscopy were applied in this study to demonstrate that PAN-base carbon fibers inherently have functional groups on their surface as a result of the reaction. The overall evidence indicates that the 4-Aminobenzoic acid functionalization of carbon fibers can be achieved without oxidation as pre-treatment. Thus, amine functionalized CFs（F-CFs）can be synthesized, without disrupting the strength of the carbon fibers.

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