Surface modification of magnesium oxide/epoxy composites with significantly improved mechanical and thermal properties

2021 ◽  
Author(s):  
Muhammad Wasim Akhtar ◽  
Kim Jong Seok ◽  
Muddassir Ali Memon ◽  
Muhammad Yasir Khan ◽  
Muhammad Moazam Baloch
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Magnesium Oxide ◽  
Epoxy Composite ◽  
Epoxy Composites ◽  
Neat Epoxy ◽  
Mechanical And Thermal Properties ◽  
Interconnected Network ◽  
Interfacial Bond ◽  
Mgo Nanoparticles

Abstract This paper demonstrated the effect of functionalized magnesium oxide (MgO) nanoparticles with 3-(Aminopropyl) triethoxysilane (APTES) as fillers on the mechanical and thermal properties of epoxy composite. The functionalization of MgO (S-MgO) considerably improved the inteface between the MgO and epoxy resin. The mechanical properties of the composites revealed that the addition of functionalized MgO improved their tensile strength, modulus of elasticity, and ductility when compared to neat epoxy. In compare to neat epoxy, the in-plane thermal conductivity of the epoxy composite with S-MgO filler improved by 10 folds. These observations indicated that the silane functionalization on MgO contributes to the formation of a strong interfacial bond and a compact interconnected network between the filler and the epoxy matrix.

scholarly journals The Effect of Interaction between Nanofillers and Epoxy on Mechanical and Thermal Properties of Nanocomposites: Theoretical Prediction and Experimental Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
S. Khostavan ◽  
M. Fazli ◽  
M. Ghorbanzadeh Ahangari ◽  
Y. Rostamiyan
Keyword(s):  
Thermal Properties ◽  
Density Functional ◽  
Theoretical Study ◽  
Epoxy Polymer ◽  
Epoxy Composite ◽  
Neat Epoxy ◽  
Mechanical And Thermal Properties ◽  
Host Matrix ◽  
Functional Theory ◽  
The Density Functional Theory

Interfacial interaction between host matrix and nanofillers is a determinative parameter on the mechanical and thermal properties of nanocomposites. In this paper, we first investigated interaction between carbon nanotube (CNT) and montmorillonite clay (MMT) absorbing on epoxy surface in a theoretical study based on the density functional theory (DFT) calculations. Results showed the interaction energy of -1.93 and -0.11 eV for MMT/epoxy and CNT/epoxy, respectively. Therefore, the interaction between epoxy polymer and MMT is of the chemisorptions type, while epoxy physically interacts with CNT. In addition, thermal and mechanical analyses were conducted on nanocomposites. In DSC analysis the glass transition temperature which was 70°C in neat epoxy composite showed an improvement to about 90°C in MMT nanocomposites while it was about 70°C for CNT nanocomposites. Finally, mechanical properties were investigated and MMT nanocomposite showed a change in compressive strength which increased from 52.60 Mpa to 72.07 and 92.98 Mpa in CNT and MMT nanocomposites, respectively. Also tensile strength improved to the value of 1250.69 Mpa MMT nanocomposites while it was about 890 Mpa in both CNT nanocomposite and neat epoxy composite which corresponds to the calculation result prediction.

Mechanical Properties of Epoxy Composites Filled with Short Steel Fibres for Hybrid Injection Moulds

2008 ◽  
Vol 587-588 ◽  
pp. 222-226 ◽  
Author(s):  
Aurélio C. Sabino-Netto ◽  
Gean V. Salmoria ◽  
Carlos H. Ahrens ◽  
António Sergio Pouzada
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Epoxy Composites ◽  
Particulate Composites ◽  
Mechanical And Thermal Properties ◽  
Fibre Reinforcement ◽  
Epoxy System ◽  
Steel Fibres ◽  
Hybrid Injection ◽  
Short Steel Fibres

Epoxide filled composites are being increasingly used for mouldings blocks of hybrid injection moulds. The filling is sought for improving both mechanical and thermal properties that are relevant for the mould performance. In spite of several works investigating the particulate filling of resins, there are only a few reports on fibre reinforcement. Composites based on an epoxy system with varying volume fractions of short steel fibres (SSF) were investigated. The mechanical properties were determined for each composite, and the topography of the fracture surfaces was analyzed by SEM. The mechanical properties of the epoxy filled composites were also compared to commercial particulate composites that are used for producing casting moulds. In spite of the SSF being more difficult to mix that the usual metal particulate fillers, it was found that the resulting composites show some improvement in the mechanical properties.

Synergistic activities of binary accelerators in presence of magnesium oxide as a cure activator in the vulcanization of natural rubber

2021 ◽  
pp. 009524432110207
Author(s):  
Md Najib Alam ◽  
Vineet Kumar ◽  
Pranut Potiyaraj ◽  
Dong-Joo Lee ◽  
Jungwook Choi
Keyword(s):  
Mechanical Properties ◽  
Zinc Oxide ◽  
Thermal Properties ◽  
Natural Rubber ◽  
Magnesium Oxide ◽  
Mechanical And Thermal Properties ◽  
Synergistic Activity ◽  
Rubber Compound ◽  
Cure Activator ◽  
Control Compound

We describe the synergistic activities of binary vulcanizing accelerators in presence of magnesium oxide as cure activator in the vulcanization of natural rubber. Thiuram type tetramethyl thiuram disulfide (TMTD) and thiocarbamate type zinc dimethyl dithiocarbamate (ZDMC) accelerators in combination with dibenzothiazyl disulfide (MBTS) were investigated for the vulcanization of rubber. The cure, mechanical, and thermal properties of rubber vulcanizates were studied with magnesium oxide-based cure activator. Notable synergism in the delta torque, cross-link density, and mechanical properties was found when using binary accelerators with magnesium oxide. The zinc-containing thiocarbamate accelerator, ZDMC, showed better synergistic activity in presence of magnesium oxide than the non-zinc-based thiuram accelerator, TMTD. To find out the possibility of making a zinc-oxide-free natural rubber compound, a control compound was prepared with 5 phr of zinc oxide as a cure activator with the best evaluated binary accelerators system with magnesium oxide (3:6 millimolar ratio of ZDMC to MBTS). We also compared the curing and mechanical properties of carbon black-reinforced rubber with zinc oxide and magnesium oxide separately with this binary accelerators system. The results indicated that a completely zinc-oxide-free natural rubber compound was possible with comparable values in the mechanical properties, thermal properties and a higher rate of vulcanization.

scholarly journals Dielectric spectroscopy and structural characterization of nano-filler-loaded epoxy resin

2021 ◽  
pp. 2150011
Author(s):  
S. G. Thakor ◽  
V. A. Rana ◽  
H. P. Vankar ◽  
T. R. Pandit
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Epoxy Composite ◽  
Structural Information ◽  
Epoxy Composites ◽  
Neat Epoxy ◽  
Frequency Range ◽  
Additional Information ◽  
Lcr Meter

This work outlines the characterization of epoxy resin [Bisphenol A-(epichlorhydrin): epoxy] and hardener [[Formula: see text](3-dimethylaminopropyl)-1,3-propylenediamine] with various inorganic nano-fillers. Dielectric characterizations of epoxy, hardener, neat epoxy (epoxy + hardener) and nano-epoxy (nano-filler + neat epoxy) composites loaded with 1 wt.% of inorganic nano-fillers (SiO2, Al2O3, TiO2 and ZnO) were carried out using precision LCR meter, over the frequency range of 1 kHz–2 MHz at a constant temperature of 300.15 K. The structural information of nano-fillers, neat epoxy and nano-epoxy composites was understood by Fourier transform infrared spectroscopy and by XRD. Moreover, hardness and shear strength (shear punch) were also determined in order to gain additional information about the mechanical properties of epoxy composite. Influence of inorganic nano-fillers on the dielectric properties, structural chemistry and mechanical properties of neat epoxy composite is discussed thoroughly in this study.

scholarly journals Development of PE/PCL Bilayer Films Modified with Casein and Aluminum Oxide

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3090
Author(s):  
Anita Ptiček Siročić ◽  
Ana Rešček ◽  
Zvonimir Katančić ◽  
Zlata Hrnjak-Murgić
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Water Vapor ◽  
Aluminum Oxide ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Mechanical And Thermal Properties ◽  
Oxide Compound ◽  
Bilayer Films ◽  
Oxide Particles

The studied samples were prepared from polyethylene (PE) polymer which was coated with modified polycaprolactone (PCL) film in order to obtain bilayer films. Thin PCL film was modified with casein/aluminum oxide compound to enhance vapor permeability as well as mechanical and thermal properties of PE/PCL films. Casein/aluminum oxide modifiers were used in order to achieve some functional properties of polymer film that can be used in various applications, e.g., reduction of water vapor permeability (WVTR) and good mechanical and thermal properties. Significant improvement was observed in mechanical properties, especially in tensile strength as well as in water vapor values. Samples prepared with aluminum oxide particles indicated significantly lower values up to 60%, and samples that were prepared with casein and 5% Al2O3 showed the lowest WVTR value.

The mechanical and thermal properties of graphitic carbon nitride ( g‐C 3 N 4 )‐based epoxy composites

2021 ◽  
pp. 51324
Author(s):  
Yasmine N. Baghdadi ◽  
Jihad Sinno ◽  
Kamal Bouhadir ◽  
Mohammad Harb ◽  
Samir Mustapha ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Epoxy Composites ◽  
Graphitic Carbon Nitride ◽  
Mechanical And Thermal Properties
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