Chemical recycling of fiber-reinforced epoxy resin using a polyethylene glycol/NaOH system

2014 ◽  
Vol 33 (22) ◽  
pp. 2106-2114 ◽  
Author(s):  
Peng Yang ◽  
Qian Zhou ◽  
Xiao-Yang Li ◽  
Ke-Ke Yang ◽  
Yu-Zhong Wang
Keyword(s):  
Polyethylene Glycol ◽  
Glass Fiber ◽  
Epoxy Resin ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Glass Fibers ◽  
Chemical Recycling ◽  
X Ray ◽  
Alkali Glass ◽  
Original Strength

A polyethylene glycol/ NaOH system has been used for chemical recycling of fiber/epoxy resin composites. Solvolysis of the composites based on different fibers, i.e. two PAN-based carbon fibers (Torry T300, T700S) and two glass fibers (non-alkali glass fiber and medium-alkali glass fiber), have been compared. The solubilization degree increases with rising reaction temperature, reaction time, as well as NaOH amount. After reacting at atmospheric pressure for 4 h at 200℃ with 0.1 g NaOH/g composite, a high decomposition efficiency of 84.1–93.0% has been obtained. Scanning electron microscopy analysis shows that the two recovered carbon fibers and the non-alkali glass fiber have a texture similar to the as-received fibers, except that some residual resin adheres to the surface, while the medium-alkali glass fiber is damaged during recycling. Accordingly, the recycled carbon fibers and the non-alkali glass fiber retain 94–96% of their original strength, while the tensile strength of the recycled medium-alkali glass fiber decreases to below 90% of this value. The two carbon fibers were further characterized using X-ray photoelectron spectroscopy and X-ray diffraction. The carbon structure is slightly oxidized and the degree of graphitization of the recovered carbon fibers slightly decreases.

scholarly journals Investigation into the color stripping of the pigment printed cotton fabric using the ozone assisted process: A study on the decolorization and characterization

2021 ◽  
Vol 16 ◽  
pp. 155892502199275
Author(s):  
Ajinkya Powar ◽  
Anne Perwuelz ◽  
Nemeshwaree Behary ◽  
Le vinh Hoang ◽  
Thierry Aussenac ◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Photoelectron Spectroscopy ◽  
Treatment Time ◽  
Pilot Scale ◽  
Chemical Recycling ◽  
X Ray ◽  
Cellulosic Fibers ◽  
Dyeing Process ◽  
Cellulosic Textiles ◽  
Ozonation Process

Color stripping is one of the most convenient ways to rectify the various shade faults occurred during printing or dyeing process of textiles. But, the conventional chemical assisted process poses serious risk of the environmental pollution. Secondly, the chemical recycling of the cellulosic fibers may be disrupted due to the presence of the impurities like colorants, finishes, and the additives in the discarded textiles. So, there is a need to study ways to remove such impurities from the discarded cellulosic textiles in a sustainable manner. This work examines the decolorization of the pigment prints on cellulosic fabrics at pilot scale using an ozone-assisted process. The effect of varying pH, ozone concentration and the treatment time on the decolorization of the pigment prints was optimized using the response surface methodology technique. The effects of ozonation process parameters on the mechanical properties of cellulosic cotton fabric were measured. Decolorization of pigment printed samples was studied with respect to the surface effects by a scanning electron microscopy (SEM), and the chemical removal effects of ozonation treatment were studied using X-ray photoelectron spectroscopy. The possible mechanism regarding the action of ozone for the decolorization is discussed.

Chemical modification of starch with epoxy resin to enhance the interfacial adhesion of epoxy-based glass fiber composites

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 84187-84193 ◽  
Author(s):  
Ying Wang ◽  
Hui Li ◽  
Xiaodan Wang ◽  
Hong Lei ◽  
Jichuan Huo
Keyword(s):  
Thermal Properties ◽  
Chemical Modification ◽  
Glass Fiber ◽  
Epoxy Resin ◽  
Interfacial Adhesion ◽  
Glass Fibers ◽  
Fiber Composites ◽  
Mechanical And Thermal Properties ◽  
Glass Fiber Composites ◽  
Chemically Modified

In order to fabricate epoxy-based glass fiber composites with superior mechanical and thermal properties, starch was chemically modified by E-51 epoxy resin, as a sizing for glass fibers.

Effect of Plasticizer of Sizing Agent on the Surface of Carbon Fibers and Interface of its Composites

2011 ◽  
Vol 337 ◽  
pp. 10-15 ◽  
Author(s):  
Huan Xia Zhang ◽  
Amin Cao ◽  
Yong Kang Luo ◽  
Li Wei
Keyword(s):  
Contact Angle ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Interfacial Shear Strength ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Interfacial Shear ◽  
X Ray ◽  
Physical Changes ◽  
Contact Angle Analysis

In this work, carbon fibers were sized with different plasticizer of sizing agent in order to improve the performances of carbon fibers and the interface of carbon fibers composites. The chemical and physical changes induced by the treatments on carbon fibers surface are examined using dynamic contact angle analysis test(DCAT) , X-ray photoelectron spectroscopy (XPS). The interfacial shear strength (IFSS) of CF/EP composites are analysised by micro-droplet test. At the same time, the wear resistance was also studied in order to understand the effect of the plasticizer of sizing agent on the carbon fibers. The study shows that the 3# sized carbon fiber has the better wetting and surface energy. XPS results reveal that the 3# samples show a significant increase in oxygen-containing groups, such as–C–OH, -COOH, -C–O–C- and -COOR. 3#sizing agent also show better interface adhesion between fibers and matrix and has better wear resistant properties.

scholarly journals A Comparative Study on Structural, Morphological, and Tensile Properties of Binary and Ternary Epoxy Resin-Based Polymer Nanocomposites

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Dalia M. T. Mustafa ◽  
Sarkawt Rostam ◽  
Shujahadeen B. Aziz
Keyword(s):  
Glass Fiber ◽  
Epoxy Resin ◽  
Polymer Nanocomposites ◽  
Mechanical Performance ◽  
Mechanical Analysis ◽  
Calcium Titanate ◽  
X Ray Diffraction ◽  
Fiber Glass ◽  
X Ray ◽  
Good Agreement

In the present work, epoxy resin-based nanocomposites (NCPs) were fabricated with improved mechanical properties. The epoxy resin (EPR) was mixed with differing amounts of calcium titanate (CaTiO3) nanoparticles (NPs) and glass fiber. The results showed that the ternary system contained glass fiber exhibits low mechanical performance compared to binary [EPR:CaTiO3] system. The effect of fiber glass and NPs on the epoxy resin mechanical behavior was determined by conducting a tensile test for various specimen sets. From the mechanical characterizations, it was seen that there is a monotonic relationship between the NPs concentration and Young’s modulus. Additionally, NCPs samples were brittle in nature and the strain rate significantly decreased upon the addition of CaTiO3 concentration; while the tensile strength was increased. From the X-ray diffraction evaluation, it can be concluded that the addition of NPs have a great impact on the epoxy structure. Besides, the morphology appearance was in good agreement with structural and mechanical analysis.

Chemical recycling of glass fiber reinforced epoxy resin cured with amine using nitric acid

Polymer ◽  
2005 ◽  
Vol 46 (6) ◽  
pp. 1905-1912 ◽  
Author(s):  
Weirong Dang ◽  
Masatoshi Kubouchi ◽  
Hideki Sembokuya ◽  
Ken Tsuda
Keyword(s):  
Nitric Acid ◽  
Glass Fiber ◽  
Epoxy Resin ◽  
Chemical Recycling ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced

scholarly journals Hybrid filament-wound materials: Tensile characteristics of (aramide fiber/glass fiber)-epoxy resins composite and (carbon fibers/glass fiber)-epoxy resins composites

2020 ◽  
Vol 70 (1) ◽  
pp. 36-46
Author(s):  
Jovan Radulović
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Epoxy Resin ◽  
Carbon Fibers ◽  
Epoxy Resins ◽  
Hybrid Composites ◽  
Resin System ◽  
Filament Wound ◽  
Epoxy Resin System

In this paper a tensile characteristics of filament-wound glass fiber-aramid fiber/epoxy resins hybrid composites and glass fiber-two carbons fibers/epoxy resins hybrid composites are presented. Basic terms about hybride composite materials (origin, reasons for manufacturing, advantages, definitions, levels of hybridization, modes of classifications, types, categorization, and possible interactions between constituents) and used reinforcements and matrices are described. For a manufacturing of NOL rings four reinforcements (glass fiber, polyamide aromatic fiber and two carbon fibers) and two matrices (high and moderate temperature curing epoxy resin system) are used. Based on experimentally obtained results, it is concluded that hybride composite material consisting of carbon fiber T800 (67 % vol) and glass fiber GR600 (33 % vol) impregnated with epoxy resin system L20 has the highest both the tensile strength value and the specific tensile strength value. The two lowest values of both tensile strength and the specific tensile strength have hybrid material containing aramide fiber K49 (33 % vol) and glass fiber GR600 (67 % vol) and epoxy resin system 0164 and hybrid NOL ring with wound carbon fiber T300 (33 % vol) and glass fiber GR600 (67 % vol) impregnated with the same epoxy resin system. This investigation pointed out that increasing the volume content of aramide fiberK49, carbon fiber T300 and carbon fiber T800 in appropriate hybrid composites with glass fiber GR600 increases both the tensile strength value and the specific tensile strength value and decrease the density value, no matter the used epoxy resin system.

Investigation on the application properties of epoxy resin and glass fiber in RTV mold rubber

e-Polymers ◽  
2016 ◽  
Vol 16 (6) ◽  
pp. 437-445 ◽  
Author(s):  
Yang Siyuan ◽  
Wang Jincheng ◽  
Wang Junhua
Keyword(s):  
Thermal Stability ◽  
Glass Fiber ◽  
Epoxy Resin ◽  
Dimensional Stability ◽  
Room Temperature ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Elongation At Break ◽  
X Ray ◽  
Scanning Electron

AbstractIn this work, epoxy resin (EP), glass fiber (GF), and modified GF (MGF) were used in the modification of room-temperature-vulcanizated (RTV) silicone rubber, and their properties were investigated and characterized. The properties such as tensile strength, elongation at break, dimensional stability, and thermal stability were studied. Results revealed that RTV/EP-3/MGF-3 exhibited the best tensile properties. Meantime, the dimensional stability of these composites was improved in a certain degree. Thermogravimetric (TG) analysis, X-ray diffraction (XRD), scanning electron microscope (SEM), and differential scanning calometry (DSC) were also used in the investigation of the microtopography, structure and properties of these RTV mold rubbers.

Nanographite Films: Structure and Properties

2016 ◽  
Vol 247 ◽  
pp. 17-23 ◽  
Author(s):  
Yury M. Nikolenko ◽  
Albert M. Ziatdinov
Keyword(s):  
Electron Microscopy ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Magnetic Characteristics ◽  
Activated Carbon Fibers ◽  
Spectroscopy Data ◽  
Structure And Properties ◽  
X Ray ◽  
Structural Blocks ◽  
Scanning Electron

Nanographite film structures of different morphology have been grown on various substrates using the activated carbon fibers (ACF) as a source of nanographites. As was revealed from the data of Raman spectroscopy, the fabricated films consisted mainly of the same structural blocks as the initial ACF. Scanning electron microscopy was used to study the films morphology. The presence of lengthy zigzag edges in nanographites, which is prerequisite for their nontrivial electronic structure and magnetic characteristics, has been established. The X-ray photoelectron spectroscopy data show the appearance of expressed maxima in the C1s spectra of the films in the usually observable "diffuse" structure of π→π* shake-up satellites, π and π + σ plasmons.

Effect of Carbon Fibers’ Surface Modification on the In Situ Growth of Carbon Nanotubes

2012 ◽  
Vol 512-515 ◽  
pp. 761-764
Author(s):  
Jian Bao Hu ◽  
Shao Ming Dong ◽  
Xiang Yu Zhang ◽  
Zhi Hui Hu ◽  
Bo Lu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Modification ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Metal Uptake ◽  
Chemical Properties ◽  
X Ray ◽  
Pretreatment Time ◽  
Physicochemical Methods

Surface modification of carbon fibers(CF) by physicochemical methods directs an attractive approach for improvement of metal uptake from solutions. We investigated pretreatment of carbon fibers by HNO3 with different time on absorption of catalysts, which is related to the coverage of carbon nanotubes (CNTs) grown on Carbon fibers. The effects of surface modifications on the properties of carbon fibers were studied by X-Ray photoelectron spectroscopy. The modifications bring about variation in the chemical properties. The modification increased a large number of surface functional groups such as hydroxyl and carbonyl. The HNO3 modification increases the catalysts absorption. The coverage of CNTs on CF increases with pretreatment time, which was studied by SEM.

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