scholarly journals Flexural Properties of Halloysite Nanotubes (HNTS) and Carbon Nanotubes (CNTS) Toughened Epoxy Composites

2020 ◽  
Vol 9 (4) ◽  
pp. 1670-1675
Keyword(s):  
Carbon Nanotubes ◽  
Surface Roughness ◽  
Flexural Modulus ◽  
Halloysite Nanotubes ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Sem Images ◽  
Micro Cracks ◽  
Dispersion State ◽  
Solution Casting Method

In this research, four different concentrations of halloysite nanotubes and carbon nanotubes (0wt%, 0.2 wt%, 0.5 wt% and 1 wt%) were produced using solution casting method. Both fillers were dispersed using bath sonicator for 10 minutes. Flexural properties, surface roughness and microhardness were studied. The highest flexural modulus and flexural strength were observed in the 0.2 wt% HNTs-epoxy composites, where the maximum values were 36.6% and 82% respectively. The maximum surface roughness was recorded in the case of 0.2 wt% HNTs-epoxy composites. The highest microhardness value was found in the 0.5 wt% HNTs-epoxy composites where the microhardness improved by 80%. The results suggest, HNTs were easily dispersed in epoxy matrix than CNTs, at shorter processing time. From the SEM images, it can be observed that, HNTs significantly changed the microstructure of the nanocomposites, as there were many straight and elevated crack lines, this can be associated with the toughening mechanism offered by the filler. CNTs on the other hand, had influenced on the micro cracks and showed semi-parabolic pattern. However, the flexural properties of CNTs are slightly lower than HNTs because CNTs have strong van der Waals force and as a result very difficult to disperse by simple sonication. HNTs can be utilised as an alternative to CNTs, since the dispersion state is better even though at minimum sonication time.

Optimization and assessment of MWCNT dispersion in polypropylene nanocomposite films

2020 ◽  
pp. 089270572096216
Author(s):  
Vivek Khare ◽  
Sudhir Kamle
Keyword(s):  
Carbon Nanotubes ◽  
Image Segmentation ◽  
Clustering Algorithm ◽  
Estimation Method ◽  
Nanocomposite Films ◽  
Sem Images ◽  
Mwcnt Concentration ◽  
Dispersion State ◽  
Solution Casting Method ◽  
Thresholding Algorithm

Functionalized carbon nanotubes dispersion in polypropylene is optimized and investigated using thresholding based image segmentation. Carbon nanotubes polypropylene films are developed using solution casting method and MWCNT dispersion is optimized upto 1% MWCNT concentration. Dispersion state is investigated by thresholding based image segmentation and agglomeration estimation method applied on scanning electron microscopy (SEM) images. K-means clustering algorithm is applied further to validate the thresholding algorithm by calculating the MWCNT weight % in processed SEM images. It is found that the proposed clustering algorithm can detect MWCNT concentration significantly upto 1%. To further validate the dispersion studies, developed nanocomposite films are used to fabricate the dragonfly inspired artificial flapping wings. The natural frequency was found maximum for 1% MWCNT-COOH-PP wing at 52.27 Hz.

scholarly journals Enhanced flexural properties of aramid fiber/epoxy composites by graphene oxide

2019 ◽  
Vol 8 (1) ◽  
pp. 484-492 ◽  
Author(s):  
Yinqiu Wu ◽  
Bolin Tang ◽  
Kun Liu ◽  
Xiaoling Zeng ◽  
Jingjing Lu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Flexural Strength ◽  
Interfacial Shear Strength ◽  
Flexural Modulus ◽  
Weight Fraction ◽  
Interfacial Shear ◽  
Aramid Fiber ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Pure Epoxy

Abstract The reinforcing effect of graphene oxide (GO) in enhancing the flexural strength and flexural modulus of aramid fiber (AF)/epoxy composites were investigated with GO-AFs at a weight fraction of 0.1-0.7%. The flexural strength and flexural modulus of the composite reached 87.16 MPa and 1054.7 MPa, respectively, which were about 21.19% and 40.86% higher than those of the pure epoxy resin, respectively. In addition, the flexural properties and interfacial shear strength (IFSS) of composite reinforced by GO-AFs were much higher than the composites reinforced by AFs due to GO improved the interfacial bonding between the reinforcement material and matrix.

The Mechanical and Physical Properties of Construction and Demolition Waste - Epoxy Composites

2018 ◽  
Vol 759 ◽  
pp. 9-14
Author(s):  
Marko Hyvärinen ◽  
Timo Kärki
Keyword(s):  
Physical Properties ◽  
Flexural Modulus ◽  
High Hardness ◽  
Mineral Elements ◽  
Construction And Demolition Waste ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Demolition Waste ◽  
Element Analysis ◽  
Develop Environment

Due to the increasing concern about the environment and depleting conventional materials, a lot of research is going on in the field of material science to develop environment friendly materials, and to improve the recycling and reusing of waste materials. Composites are material providing possibilities to reach these targets. In this experimental study, the possibilities and potential in the utilization of mixed waste from recycling in the manufacturing of epoxy composites are studied. The studied properties are flexural properties, i.e. flexural strength and flexural modulus, and hardness as mechanical properties, and water absorption and thickness swelling as physical properties. Element analysis was used to determine the composition of construction and demolition waste used in manufacturing. The analysis revealed a large proportion of mineral elements with high hardness. Consequently, this had a clear impact on the hardness of the composite. The flexural properties were found to be on a reasonable level. The waste-epoxy composite showed a low uptake of water due to the minor content of hydrophilic materials present in the composite.

Study of Surface Characteristics of T700 Carbon Fibers and Interfacial Properties of their Reinforced Epoxy Composites

2013 ◽  
Vol 364 ◽  
pp. 706-710
Author(s):  
Ling Cong Li ◽  
Li Li Wang ◽  
Hua Hao ◽  
Hui Ling ◽  
Hong Jie Sun ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Energy ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Interfacial Adhesion ◽  
Dynamic Contact Angle ◽  
Surface Characteristics ◽  
Interfacial Properties ◽  
Epoxy Composites ◽  
Sem Images

The purpose of this paper is to comparatively study the surface characteristics of domestic and Toray T700 carbon fibers (T700-CFs) and the interfacial properties of their reinforced epoxy composites. The surface roughness and surface energy of the fibers were characterized by scanning electron microscope (SEM) and dynamic contact angle analysis (DCAA). The surface chemistry analysis of the fibers was carried out by using X-ray photoelectron spectroscopy (XPS). The interfacial properties of the T700-CF/epoxy composites were studied by testing the interlaminar shear strength (ILSS), observing SEM images of composites profiles and calculating the interfacial adhesion factors from dynamic mechanical thermal analysis (DMTA) data. The results show that domestic T700-CFs have a better interfacial adhesion to epoxy matrix due to its higher surface roughness, chemical activity and surface energy than Toray T700-CFs.

Long term hydrothermal effect on the mechanical and thermo-mechanical properties of carbon nanofiber doped epoxy composites

2018 ◽  
Vol 38 (3) ◽  
pp. 251-261 ◽  
Author(s):  
Sunirmal Saha ◽  
Smrutisikha Bal
Keyword(s):  
Water Absorption ◽  
Epoxy Polymer ◽  
Carbon Nanofiber ◽  
Flexural Modulus ◽  
Epoxy Composites ◽  
After Effects ◽  
Micro Cracks ◽  
Influence Of Water ◽  
Carbon Nanofibre ◽  
Experimental Findings

AbstractThe influence of water absorption on the mechanical and thermo-mechanical behaviour of carbon nanofibre (CNF) doped epoxy composites was investigated. When immersed in seawater for a long interval of 6 months, all the composite specimens endured saturation whilst weight change of composites was periodically monitored after removal of travelling specimens from a water-beaker. The equilibrium water content and the diffusion coefficient of all composites were evaluated with the help of Fick’s law of diffusion. The results demonstrated a general reduction in flexural modulus and strength, hardness, storage modulus and glass transition temperature (Tg) for seawater exposed specimens due to absorption of seawater as compared to their unexposed specimens. After-effects of water absorption such as plasticisation, swelling of epoxy polymer, interfacial damages and micro-cracks, were marked as the main reasons behind the deterioration of properties. However, among all, the least degradation in properties was observed in the nanocomposite with 0.75 wt.% CNFs loading. Such trivial degradation in properties is due to formation of strong interface of CNFs with the epoxy polymer. The experimental findings were further confirmed by the microstructures of fractured specimens using field emission scanning electron microscopy.

Investigation of the effect of CNTs on the mechanical properties of LPET/glass fiber thermoplastic composites

2019 ◽  
Vol 33 (12) ◽  
pp. 1652-1673 ◽  
Author(s):  
O Demircan ◽  
A Al-darkazali ◽  
İ İnanç ◽  
V Eskizeybek
Keyword(s):  
Carbon Nanotubes ◽  
Glass Fiber ◽  
Interfacial Adhesion ◽  
Flexural Modulus ◽  
Thermoplastic Composites ◽  
Flexural Properties ◽  
Hot Press ◽  
Fiber Glass ◽  
Multiwalled Carbon ◽  
Commingled Yarns

Within this research, four kinds of multiwalled carbon nanotubes (MWCNTs; 0.0, 0.7, 0.9, and 1.1 wt%) integrated thermoplastic composites with commingled yarns (low melting point polyethylene terephthalate fiber/glass fiber) were fabricated using hot-press machine. The fabricated composites were tested against tensile and three-point flexural loadings. Specimens with 0.9-wt% MWCNTs in 90° direction showed the highest values of tensile and flexural properties with an improvement of about 7% and 33% in tensile and flexural modulus and about 3% and 65% in tensile and flexural strength compared to specimens without MWCNTs in 90° direction. This improvement can most likely be attributed to an increase in interfacial adhesion due to the presence of the carbon nanotubes.

scholarly journals Halloysite reinforced epoxy composites with improved mechanical properties

2016 ◽  
Vol 18 (1) ◽  
pp. 133-135 ◽  
Author(s):  
Muhammad Jawwad Saif ◽  
Muhammad Asif ◽  
Muhammad Naveed ◽  
Khalid Mahmood Zia ◽  
Waheed -uz- Zaman ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Flexural Modulus ◽  
Halloysite Nanotubes ◽  
Epoxy Composites ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Interfacial Coupling ◽  
Uniform Dispersion

Abstract Halloysite nanotubes (HNTs) reinforced epoxy composites with improved mechanical properties were prepared. The prepared HNTs reinforced epoxy composites demonstrated improved mechanical properties especially the fracture toughness and flexural strength. The flexural modulus of nanocomposite with 6% mHNTs loading was 11.8% higher than that of neat epoxy resin. In addition, the nanocomposites showed improved dimensional stability. The prepared halloysite reinforced epoxy composites were characterized by thermal gravimetric analysis (TGA). The improved properties are attributed to the unique characteristics of HNTs, uniform dispersion of reinforcement and interfacial coupling.

Effect of Amino Multi Walled Carbon Nanotubes Reinforcement on the Flexural Properties of Neat Epoxy

2014 ◽  
Vol 592-594 ◽  
pp. 912-916 ◽  
Author(s):  
K. Chandra Shekar ◽  
B. Anjaneya Prasad ◽  
N. Eswara Prasad
Keyword(s):  
Carbon Nanotubes ◽  
Nonlinear Deformation ◽  
Flexural Modulus ◽  
Neat Epoxy ◽  
Flexural Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Three Point Bend Test ◽  
Point Bend ◽  
Sonication Technique ◽  
Walled Carbon Nanotubes

The effect of amino multi-walled carbon nanotubes (MWCNTs) on the flexural properties of epoxy/ nanocomposites was studied. Sonication technique was employed for dispersion of amino MWCNTs in epoxy. The properties of both neat epoxy and nanocomposites extensively studied by using three point bend test and scanning electron microscopy. From the experimental results, it was found that reinforcement with carbon nanotubes improved the flexural properties, namely (a) flexural modulus, (b) flexural strength, (c) nonlinear deformation and (d) total flexural toughness.

scholarly journals Comparing Multi-Walled Carbon Nanotubes and Halloysite Nanotubes as Reinforcements in EVA Nanocomposites

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3809 ◽  
Author(s):  
Agata Zubkiewicz ◽  
Anna Szymczyk ◽  
Piotr Franciszczak ◽  
Agnieszka Kochmanska ◽  
Izabela Janowska ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Ethylene Vinyl Acetate ◽  
Tensile Tests ◽  
Halloysite Nanotubes ◽  
Hybrid Nanocomposites ◽  
Sem Images ◽  
Mechanical And Electrical Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Hybrid Reinforcement ◽  
Walled Carbon Nanotubes

The influence of carbon multi-walled nanotubes (MWCNTs) and halloysite nanotubes (HNTs) on the physical, thermal, mechanical, and electrical properties of EVA (ethylene vinyl acetate) copolymer was investigated. EVA-based nanocomposites containing MWCNTs or HNTs, as well as hybrid nanocomposites containing both nanofillers were prepared by melt blending. Scanning electron microcopy (SEM) images revealed the presence of good dispersion of both kinds of nanotubes throughout the EVA matrix. The incorporation of nanotubes into the EVA copolymer matrix did not significantly affect the crystallization behavior of the polymer. The tensile strength of EVA-based nanocomposites increased along with the increasing CNTs (carbon nanotubes) content (increased up to approximately 40% at the loading of 8 wt.%). In turn, HNTs increased to a great extent the strain at break. Mechanical cyclic tensile tests demonstrated that nanocomposites with hybrid reinforcement exhibit interesting strengthening behavior. The synergistic effect of hybrid nanofillers on the modulus at 100% and 200% elongation was visible. Moreover, along with the increase of MWCNTs content in EVA/CNTs nanocomposites, an enhancement in electrical conductivity was observed.

Effects of nanobarium titanate on physical and mechanical properties of poly(methyl methacrylate) denture base nanocomposites

2020 ◽  
pp. 096739112092644
Author(s):  
NW Elshereksi ◽  
A Muchtar ◽  
CH Azhari
Keyword(s):  
Surface Roughness ◽  
Flexural Strength ◽  
Filler Content ◽  
Flexural Modulus ◽  
Tensile Modulus ◽  
Physical And Mechanical Properties ◽  
Dental Composites ◽  
Flexural Properties ◽  
Denture Base ◽  
Additional Amount

The aim of this study was to (1) fabricate polymethyl methacrylate (PMMA) nanocomposites having better mechanical strength, (2) investigate the effects of nanobarium titanate (NBT) loadings (1–9 wt%) on tensile and flexural properties, and (3) evaluate surface roughness and hardness of the PMMA nanocomposites. The NBT was treated using a titanate coupling agent. Density, polymerization shrinkage (PS), surface roughness, and hardness were investigated. Tensile and flexural properties of PMMA nanocomposites were also evaluated. The roughness values of PMMA nanocomposites were significantly lower than those values proposed as a reference for clinical use (<200 nm). Moreover, the flexural modulus of the NBT/PMMA nanocomposites increased with increasing filler loadings. A remarkable increase in the tensile modulus values of filled PMMA was also observed ( p < 0.001). In the case of higher filler content, tensile modulus remains unaffected by filler incorporation. The tensile and flexural strength improved with increasing concentration of NBT up to 5 wt% and then decreased by an additional amount of NBT introduced into the nanocomposite resin. However, the tensile and flexural strength values of NBT/PMMA nanocomposites were higher than the PMMA matrix ( p < 0.001). Such enhancements obtained with titanate-treated NBT could lead to the promotion of the dental composites’ longevity.

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