Exfoliated two-dimensional molybdenum disulfide reinforced epoxy syntactic foams

2021 ◽  
pp. 0021955X2098715
Author(s):  
AV Ullas ◽  
D Kumar ◽  
PK Roy
Keyword(s):  
Mechanical Properties ◽  
Molybdenum Disulfide ◽  
Volume Fraction ◽  
Syntactic Foam ◽  
Strain Curve ◽  
Syntactic Foams ◽  
Two Dimensional ◽  
Filler Volume Fraction ◽  
Micro Particles ◽  
Reinforcing Agent

In this paper, we report the effect of introducing molybdenum disulfide (MoS2) nano-platelets: a two-dimensional metal chalcogenide, on the mechanical properties of hollow glass microballoon (HGM)–epoxy syntactic foams. MoS2 reinforced syntactic foams were prepared by mixing MoS2 nanoplatelets to epoxy containing HGMs; with the amount of MoS2 being varied from 0.01 to 0.04% v/v, while maintaining a constant total filler volume fraction of 40% for all compositions. The mechanical behaviour of reinforced syntactic foam was studied under varied loadings including compressive, tensile and flexural under different strain rate regimes. Introduction of MoS2 led to significant improvements in characteristic mechanical properties, particularly in terms of compressive strength and toughness, which suggest intercalation of MoS2 within the epoxy matrix; however, the presence of relatively larger MoS2 micro particles couldn’t be completely negated. The toughness of the foam, as indicated by the area under the compressive stress-strain curve, was found to increase by ∼21% under optimal conditions. Our results highlight the potential of the two-dimensional MoS2 sheets as a reinforcing agent in syntactic foams.

Mechanical Properties of MWCNT Modified Syntactic Foams with High Volume Fraction of Glass Microspheres

2014 ◽  
Vol 1000 ◽  
pp. 122-125 ◽  
Author(s):  
Martina Drdlová ◽  
Michal Frank ◽  
Jaroslav Buchar ◽  
Josef Krátký
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Volume Fraction ◽  
Syntactic Foam ◽  
High Volume ◽  
High Volume Fraction ◽  
Syntactic Foams ◽  
Glass Microspheres ◽  
Multi Wall Carbon Nanotubes

The effect of multi-wall carbon nanotubes content on physico-mechanical properties of glass microspheres-epoxy resin syntactic foam was evaluated experimentally. Syntactic foam with high volume fraction of microspheres (70 vol%) was prepared and modified by 1 to 5 vol% of multi-wall carbon nanotubes. The compressive, flexural and impact strength tests were conducted, the load-displacement curves were captured. The quality of dispersion of nanoparticles was evaluated in relation to the mixing procedure using scanning electron microscope observation.

The effect of nano-additive reinforcements on thermoplastic microballoon epoxy syntactic foam mechanical properties

2017 ◽  
Vol 52 (7) ◽  
pp. 971-980 ◽  
Author(s):  
Kerrick R Dando ◽  
David R Salem
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanofiber ◽  
Volume Fraction ◽  
Syntactic Foam ◽  
Halloysite Nanotubes ◽  
Core Material ◽  
Mechanical And Thermal Properties ◽  
Syntactic Foams ◽  
Micro Computed Tomography ◽  
Halloysite Nanotube

Syntactic foams comprising glass microballoons have gained considerable attention over the past several years due to mechanical and thermal properties that are advantageous for use as a core material in naval and aerospace applications. Recent advancements in the production of thermoplastic microballoon syntactic foams have allowed for an increase in microballoon volume fraction (up to 0.9 volume fraction), with correspondingly lower densities but reduced mechanical properties. In this work, carbon nanofibers and halloysite nanotubes were incorporated in thermoplastic microballoon-based syntactic foam to enhance the mechanical properties and the relative effects of these two nanoscale reinforcements were compared. X-ray micro-computed tomography was employed to analyze the microstructure of the materials produced, and scanning electron microscopy was used to assess the dispersion of nano-additives within the resin. Compressive strength and modulus enhancements as large as 180% and 250% respectively were achieved with a 0.25 wt% addition of carbon nanofiber and increases of 165% and 244% respectively were achieved with a 0.5 wt% addition of halloysite nanotube. Tensile strength and modulus enhancements as large as 110% and 165% respectively were achieved with a 0.125 wt% addition of carbon nanofiber and increases of 133% and 173% respectively were achieved with a 0.125 wt% addition of halloysite nanotube.

Controlling of Distribution of Mechanical Properties in Functionally-Graded Syntactic Foams for Impact Energy Absorption

2012 ◽  
Vol 706-709 ◽  
pp. 729-734 ◽  
Author(s):  
Masahiro Higuchi ◽  
Tadaharu Adachi ◽  
Yuto Yokochi ◽  
Kenta Fujimoto
Keyword(s):  
Mechanical Properties ◽  
Density Distribution ◽  
Energy Absorption ◽  
Impact Energy ◽  
Volume Fraction ◽  
Functionally Graded ◽  
Syntactic Foams ◽  
Compression Tests ◽  
Density Distributions ◽  
Control Distribution

In the study, novel fabrication processes of functionally-graded (FG) syntactic foams were developed to control distribution of the mechanical properties in the FG foams for highly impact energy absorption. In order to control mechanical properties, the density distributions in FG foams were graded by floating phenomenon of the light-weight micro-balloons in matrix resin during curing process. The density distribution in the foam could be controlled by adjusting the average volume fraction and the turning procedure of the mold before grading the micro-balloons in the foam. The compression tests of the fabricated FG foams suggested that the foams had high absorption of impact energy since the foams collapsed progressively due to the grading of the density distribution.

Defect evolution behaviors from single sulfur point vacancies to line vacancies in the monolayer molybdenum disulfide

2021 ◽  
Author(s):  
Chan Gao ◽  
Xiaoyong Yang ◽  
Ming Jiang ◽  
LiXin Chen ◽  
Zhi Wen Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Transition Metal ◽  
Molybdenum Disulfide ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Defect Evolution ◽  
Metal Dichalcogenides ◽  
Optoelectronic Applications

Two-dimensional monolayer transition metal dichalcogenides (TMDs) are the promising candidates for many novel nanoelectronic and optoelectronic applications due to their exceptional electronic, optical, chemical and mechanical properties. Experimentally, single chalcogen...

Dynamic Mechanical Properties of Polypropylene Syntactic Foam with Polymer Microballoons

2007 ◽  
Vol 7-8 ◽  
pp. 289-294
Author(s):  
Hiroyuki Mae ◽  
Masaki Omiya ◽  
Kikuo Kishimoto
Keyword(s):  
Mechanical Properties ◽  
Syntactic Foam ◽  
Environmental Scanning Electron Microscopy ◽  
Tensile Tests ◽  
Dynamic Mechanical Properties ◽  
Environmental Scanning ◽  
Strain Rates ◽  
Syntactic Foams ◽  
Bulk Specimen ◽  
Polypropylene Matrix

The main objective of this study is to measure and characterize the mechanical properties of the thermoplastic syntactic foams at the intermediate and high strain rates. The syntactic foam consists of the elastically deformable microballoons in the polypropylene matrix. The four types of syntactic foams and one polypropylene bulk specimen are prepared at same manufacturing process: 0, 20, 30, 40 and 50 volume percent of microballoons. Tensile tests are conducted at nominal strain rates ranging from 10-1 to 102 (1/sec). Elastic modulus, yield stress and rupture strain are measured and the effects of microballoons on the mechanical properties are studied. In addition, fracture surfaces are observed with ESEM (Environmental Scanning Electron Microscopy). Finally, the changes of fracture mode due to microballoons are discussed.

Effect of Size of Cellulose Particle as Filler in the PVC Biocomposites on their Thermal and Mechanical Properties

2013 ◽  
Vol 737 ◽  
pp. 67-73 ◽  
Author(s):  
Muhammad Ghozali ◽  
Agus Haryono
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Composite Films ◽  
High Energy ◽  
Hot Press ◽  
Filler Volume Fraction ◽  
High Energy Ball Mill ◽  
Cellulose Composites ◽  
Press Method ◽  
Energy Ball

The combination between synthetic polyolefin with natural polymer such as cellulose, starch and chitosan can stimulate biodegradation processes of waste plastics such as polyethylene (PE), polypropylene (PP) and other conventional plastics. In this work, PVC (polyvinyl chloride) biocomposite was prepared by compounding cellulose particle into PVC matrix in the presence of PVC-g-maleic anhydride as a compatibilizer. Cellulose nanoparticles were prepared by physical top-down method after milling by using High-Energy Ball-mill. The diameter size of cellulose nanoparticle was obtained as 170 nm. Cellulose particles were added as filler with ratio of 10-30 phr in PVC matrix. PVC biocomposites was prepared as a sheet film with the thickness of 0.3 mm by hot-press method. The addition of cellulose particle into PVC matrix was examined in various filler volumes and various cellulose particle sizes. The obtained PVC composite films were characterized by means of Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA) and Fourier-Transformed Infrared (FTIR) spectroscopy. The rheological and mechanical properties of PVC and cellulose composites were investigated as a function of surface structure and filler volume fraction.

Strength Analysis of Syntactic Foams Using a Three-Dimensional Continuum Damage Finite Element Model

2015 ◽  
Vol 82 (2) ◽  
Author(s):  
Yejie Shan ◽  
Guodong Nian ◽  
Qiang Xu ◽  
Weiming Tao ◽  
Shaoxing Qu
Keyword(s):  
Finite Element ◽  
Tensile Strength ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Syntactic Foam ◽  
Interfacial Strength ◽  
Strength Analysis ◽  
Failure Behavior ◽  
Fe Model ◽  
Syntactic Foams

The failure behavior of the syntactic foams is investigated based on a three-dimensional (3D) micromechanical finite element (FE) model, by varying the volume fraction, the wall thickness of the hollow particles, and the interfacial strength. The maximum principal stress criterion is adopted to determine the state (damaged or undamaged) for both interface and matrix. Material property degradation is used to describe the mechanical behavior of those damaged elements. The current model can reasonably predict the tensile strength of the syntactic foams with high volume fractions (40%–60%). The failure mechanism of the syntactic foam under uniaxial tension is captured by analyzing the stress–strain curves and the contours of damaging evolution process. Results from the quantitative simulations demonstrate that the tensile strength of the syntactic foam can be improved effectively by enhancing the interfacial strength.

Effect of Glass Microballoons Size on Compressive Strength of Syntactic Foams

2011 ◽  
Vol 321 ◽  
pp. 7-10 ◽  
Author(s):  
Zhuo Chen ◽  
Zhi Xiong Huang ◽  
Yan Qin ◽  
Min Xian Shi ◽  
Qi Lin Mei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Compressive Strength ◽  
Size Distribution ◽  
Syntactic Foam ◽  
Syntactic Foams ◽  
Static Compression ◽  
Distribution Ranges ◽  
Glass Microballoons ◽  
Quasi Static Compression

In this work, syntactic foams made of microballoons having same wall thickness ratio but with different particle size was prepared. Microballoons of three size distribution ranges were selected .The property of the syntactic foams were studied by quasi-static compression test. The experimental results show the microballoons size doesn’t influent the mechanical properties of the syntactic foam significantly. The failure mode of the syntactic foams was also studied in this work.

Nanoclay and Microballoons Wall Thickness Effect on Dynamic Properties of Syntactic Foam

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
Sameer L. Peter ◽  
Eyassu Woldesenbet
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Wall Thickness ◽  
Strain Energy ◽  
High Strain ◽  
Volume Fraction ◽  
Dynamic Properties ◽  
Syntactic Foam ◽  
Syntactic Foams ◽  
Composite Foams

The effect of nanoclay on the high strain rate mechanical properties of syntactic foams is studied. Two types of microballoons with different wall thicknesses are used in fabrication of plain and nanoclay syntactic foams. Plain syntactic foams are fabricated with 60% volume fraction of glass microballoons. 1%, 2%, and 5% volume fractions of Nanomer I.30E nanoclay are incorporated to produce nanoclay syntactic foams. High strain rate test using split Hopkinson pressure bar (SHPB) apparatus is performed on all types of plain and nanoclay syntactic foams. Dynamic modulus, strength, and corresponding strain are calculated using the SHPB data. Quasistatic test is also performed and results are compared with the dynamic SHPB results. The results demonstrate the importance of nanoclay and microballoon wall thickness in determination of syntactic foam dynamic properties. It is found that at a high strain rate, the strength and modulus of composite foams having K46 microballoons increase due to addition of 1% volume fraction of nanoclay. However, in composite foams having S22 microballoons, the increase in strength is not significant at a high strain rate. Further increase in nanoclay volume fraction to 2% and 5% reduces the strength and modulus of composite foams having S22 microballoons. Difference in wall thickness of microballoons is found to affect the strength, modulus, strain energy, and deformation of composite foams. Composite foams fabricated with thicker walled microballoons (K46) show comparatively higher values of strength, modulus, and strain energy compared with thin walled (S22) microballoons. Scanning electron microscopy shows that crack propagation behavior is distinct at different strain rates.

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