SYNTHESIS OF HYBRID SiC/SiO2 NANOPARTICLES AND THEIR POLYMER NANOCOMPOSITES

2013 ◽  
Vol 12 (02) ◽  
pp. 1350008 ◽  
Author(s):  
TARIG A. HASSAN ◽  
VIJAYA K. RANGARI ◽  
FREDRIC BAKER ◽  
SHAIK JEELANI
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
High Intensity ◽  
Thermo Gravimetric Analysis ◽  
Neat Epoxy ◽  
Hybrid Nanoparticles ◽  
Gravimetric Analysis ◽  
Sonochemical Method ◽  
Thermal And Mechanical Properties ◽  
Sic Nanoparticles

In the present investigation, silicon carbide (β-SiC) nanoparticles (~ 30 nm) were coated on silicon dioxide (SiO2) nanoparticles (~ 200 nm) using sonochemical method. The resultant hybrid nanoparticles were then infused into SC-15 epoxy resin to enhance the thermal and mechanical properties of SC-15 epoxy for structural application. To fabricate an epoxy-based nanocomposite containing SiC/SiO2 hybrid nanoparticles, we have opted a two-step process. In the first step, the silica nanoparticles were coated with SiC nanoparticles using high intensity ultrasonic irradiation. In a second step, 1 wt.% of as-prepared SiC/SiO2 particles were dispersed in epoxy part-A (diglycidylether of bisphenol A) using a high intensity ultrasound for 30 min at 5°C. The part-B (cycloaliphatic amine hardener) of the epoxy was then mixed with part-A- SiC/SiO2 mixture using a high-speed mechanical stirrer for 10 min. The SiC/SiO2 /epoxy resin mixture was cured at room temperature for 24 h. The SiC nanoparticles coating on SiO2 was characterized using X-ray diffraction (XRD) and high resolution transmission electron microscope (TEM). The as-prepared nanocomposite samples were characterized using thermo gravimetric analysis (TGA) and differential scanning calorimeter (DSC). Compression tests have been carried out for both nanocomposite and neat epoxy systems. The results indicated that 1 wt.% (SiC) + (SiO2) loading derived improvements in both thermal and mechanical properties when compared to the neat epoxy system.

Surface Modified Clay Reinforced Silicon Incorporated Epoxy Hybrid Nanocomposites: Thermal, Mechanical, and Morphological Properties

2018 ◽  
Vol 9 (1) ◽  
pp. 1-22
Author(s):  
C. Karikal Chozhan ◽  
A. Chandramohan ◽  
M. Alagar
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Thermo Gravimetric Analysis ◽  
Epoxy Composites ◽  
Neat Epoxy ◽  
Gravimetric Analysis ◽  
Modified Clay ◽  
Mmt Clay ◽  
Surface Modified

The silicon-containing epoxy/clay nanocomposites were developed by incorporating the surface-modified MMT clay upto 7wt% into Si-epoxy resin. The surface of the montmorillonite (MMT) clay was modified with two surface modifiers namely cetyltrimethylammonium bromide (CTAB) and 3-aminopropyltriethoxysilane (γ-APS). The surface modified clay reinforced Si-epoxy composites were developed in the form of castings, and were characterized for their thermal and mechanical properties. Thermal behaviour of the composites was characterized by differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA) and dynamic mechanical analysis (DMA). Mechanical properties were studied as per ASTM standards. Data result from the different studies, it is inferred that the surface modified clay reinforced Si-epoxy composites exhibit lower Tg than that of neat epoxy matrix (127°C <165°C). The decomposition temperature for 60% weight loss of clay reinforced Si-epoxy composites is 674–823°C which is higher when compared to that of neat epoxy matrix. For 5wt% clay reinforced Si-epoxy composites, the values of tensile, flexural and impact strength are increased to 26%, 21% and 29% respectively. The storage modulus (E’) is increased from 5932 to 6308 MPa for clay reinforced Si-epoxy resin. XRD analysis confirmed the well-dispersed exfoliated nanocomposites structure.

scholarly journals Thermal and mechanical properties of epoxy resin reinforced with modified iron oxide nanoparticles

2021 ◽  
pp. 50533
Author(s):  
Yasmine N. Baghdadi ◽  
Lucia Youssef ◽  
Kamal Bouhadir ◽  
Mohammad Harb ◽  
Samir Mustapha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Iron Oxide ◽  
Epoxy Resin ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Thermal And Mechanical Properties

scholarly journals Biocomposites of Bio-Polyethylene Reinforced with a Hydrothermal-Alkaline Sugarcane Bagasse Pulp and Coupled with a Bio-Based Compatibilizer

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2158
Author(s):  
Nanci Vanesa Ehman ◽  
Diana Ita-Nagy ◽  
Fernando Esteban Felissia ◽  
María Evangelina Vallejos ◽  
Isabel Quispe ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Water Absorption ◽  
Sugarcane Bagasse ◽  
Thermo Gravimetric Analysis ◽  
Decomposition Temperature ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Cradle To Gate ◽  
Bagasse Pulp

Bio-polyethylene (BioPE, derived from sugarcane), sugarcane bagasse pulp, and two compatibilizers (fossil and bio-based), were used to manufacture biocomposite filaments for 3D printing. Biocomposite filaments were manufactured and characterized in detail, including measurement of water absorption, mechanical properties, thermal stability and decomposition temperature (thermo-gravimetric analysis (TGA)). Differential scanning calorimetry (DSC) was performed to measure the glass transition temperature (Tg). Scanning electron microscopy (SEM) was applied to assess the fracture area of the filaments after mechanical testing. Increases of up to 10% in water absorption were measured for the samples with 40 wt% fibers and the fossil compatibilizer. The mechanical properties were improved by increasing the fraction of bagasse fibers from 0% to 20% and 40%. The suitability of the biocomposite filaments was tested for 3D printing, and some shapes were printed as demonstrators. Importantly, in a cradle-to-gate life cycle analysis of the biocomposites, we demonstrated that replacing fossil compatibilizer with a bio-based compatibilizer contributes to a reduction in CO2-eq emissions, and an increase in CO2 capture, achieving a CO2-eq storage of 2.12 kg CO2 eq/kg for the biocomposite containing 40% bagasse fibers and 6% bio-based compatibilizer.

scholarly journals SiO2 particles effect on the mechanical properties of the starch/PVA blends

2018 ◽  
Vol 16 (36) ◽  
pp. 153-171
Author(s):  
Nahida J. H.
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Ultimate Strength ◽  
Thermo Gravimetric Analysis ◽  
Polymer System ◽  
Optical Microscope ◽  
Gravimetric Analysis ◽  
Ratio Increase

The present work studies the mechanical properties of SiO2 μPs, and NPs in St/PVA blends. The samples were prepared by casting method as PVA, St/PVA blends at different concentrations (30, 40, 50, and 60 %). DSC and TGA tests were carried out to the samples evolved. The result showed a single glass transition temperature (Tg) for all St /PVA blends that was attributed to the good miscibility of the blends involved. It was found that (Tg) decrease with starch ratio increase. It was seen that (PVA) of (Tg=105 oC); The glass transition temperature which was decrease with starch ratio that was attributed to glass transition relaxation process due to micro-Brownian motion of the main chain back bond. The endothermic peak at 200 oC was attributed to melting point of (PVA). Thermal properties of PVA; and St /PVA blends at different concentration (30, 40, 50, and 60 %) were evaluated by thermo gravimetric analysis (TGA). The analyses were carried out from 20 to 600 oC at 10 oC)/min heating rate in air oxygen atmosphere. The weight loss stages depended on polymer system. The starch addition causing shifting in the second degradation temperature to the higher temperature; which result in overlapping between the two main degradation steps, these result was attributed to the St/ PVA blend compatibility. The mechanical properties results showed a decrease in ultimate strength with starch ratio increase. The ultimate strength of (PVA) was (47 MPa), whereas the ultimate strength of 60 %St/PVA was (11 MPa) and for 30 %St/PVA was the highest ultimate strength of blends involved (26 MPa). SiO2μPs (753.7 nm), and NPs (263.1 nm) were added at different concentrations (1.5, 2, and 2.5 %). 1.5% SiO2μPs, and NPs of the best ultimate strength (69 MPa), (86 MPa) respectively then it was decreased by SiO2μPs, and NPs increase. Optical microscope of the samples involved was investigated. It was concluded the prepared samples were suggested to be used as packaging materials for agriculture application and its ultimate strength could be controlled by SiO2μPs, and NPs addition.

Curing Process and Heat-Resistance of Polyethersulfone Toughened Epoxy Resins

2017 ◽  
Vol 898 ◽  
pp. 2302-2308
Author(s):  
Jin Li Zhou ◽  
Shu Zhu ◽  
Wen Pin Jia ◽  
Chao Cheng ◽  
Elwathig A.M. Hassan ◽  
...  
Keyword(s):  
Heat Resistance ◽  
Epoxy Resin ◽  
Thermo Gravimetric Analysis ◽  
Exothermic Peak ◽  
Curing Temperature ◽  
Gravimetric Analysis ◽  
Curing Process ◽  
Thermo Gravimetric ◽  
Rich Phase ◽  
Curing Reaction

In order to improve the toughness of epoxy resin, hydroxyl-terminated polyethersulfone (PES) with various amounts (0 wt.%, 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%) were added to bisphenol A epoxy resin (DER331)/ curing agent DETDA (E100) systems, and the influence of PES contents on curing process and heat-resistance was studied. Non-isothermal DSC was used to determine the curing process of uncured DER331/E100/PES systems at heating rate of 2°C/min, 5°C/min, 7°C/min, 10°C/min and 15°C/min separately, and the apparent activation energy was calculated based on Kissinger method. The morphology of the etched cured DER331/E100/PES systems with different PES contents was observed by SEM. The heat-resistance of these systems was investigated by DSC and TGA. The results showed that with the increasing of PES content the curing exothermic peak, the heat of curing reaction, the initial and final curing temperature all decreased at the first and then increased, indicating that when the PES content was low (5 wt.%, 10 wt.%), PES can facilitate the curing process, while, when PES content up to 15 wt.%, PES can prevent or weaken the curing reaction. SEM results indicated that the phase structure changed drastically depending on the PES content. The systems with 5 wt.% and 10 wt.% PES were epoxy-rich phase, with 15 wt.% PES was co-continuity phase, and with 20 wt.% PES showed complete phase inversion (PES rich phase). The glass transition temperature and thermo gravimetric analysis demonstrated that the addition of PES can increase the heat resistance of cured DER331/E100/PES systems.

scholarly journals Effects of hygrothermal cycling on the chemical, thermal, and mechanical properties of 862/W epoxy resin

2012 ◽  
Vol 24 (6) ◽  
pp. 470-477 ◽  
Author(s):  
Sandi G. Miller ◽  
Gary D. Roberts ◽  
Justin L. Bail ◽  
Lee W. Kohlman ◽  
Wieslaw K. Binienda
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Thermal And Mechanical Properties

Mechanical Properties of Electrospun Carbon Nano Fiber (ECNF)/Epoxy Nanocomposites

2007 ◽  
Author(s):  
Darunee Aussawasathien ◽  
Erol Sancaktar
Keyword(s):  
Mechanical Properties ◽  
Aspect Ratio ◽  
Epoxy Resin ◽  
Carbon Nanofiber ◽  
Mechanical Analysis ◽  
Short Fiber ◽  
Neat Epoxy ◽  
Epoxy Nanocomposites ◽  
Cure Reaction ◽  
Fiber Aspect Ratio

Electrospun polyacrylonitrile (PAN) fiber precursor based Carbon Nanofiber (CNF) mats were produced and impregnated with epoxy resin. The mechanical properties of as-prepared nanofibers in the mat and short fiber filled epoxy nanocomposite forms were determined to demonstrate the effect of fiber aspect ratio and interconnecting network on those properties. Our experimental results reveal that epoxy nanocomposites containing Electrospun Carbon Nano Fibers (ECNF) with high fiber aspect ratio and high interconnecting network in the non-woven mat form yield better mechanical properties than those filled with short ECNFs. The ECNF mat in epoxy nanocomposites provides better homogeneity, more interlocking network, and easier preparation than short ECNFs. Mechanical properties of ECNF mat-epoxy nanocomposites, which we obtained using tensile and flexural tests, such as stiffness and modulus increased, while toughness and flexural strength decreased, compared to the neat epoxy resin. Dynamic Mechanical Analysis (DMA) results showed, higher modulus for ECNF mat-epoxy nanocomposites, compared to those for neat epoxy resin and short ECNF-epoxy nanocomposites. The epoxy nanocomposites had high modulus, even though the glass transition temperature, Tg values dropped at some extents of ECNF mat contents when compared with the neat epoxy resin. The cure reaction was retarded since the amount of epoxy and hardener decreased at high ECNF contents together with the hindering effect of the ECNF mat to the diffusion of epoxy resin and curing agent, leading to low crosslinking efficiency.

Effect of reactive and non-reactive diluents on thermal and mechanical properties of epoxy resin

2017 ◽  
Vol 30 (10) ◽  
pp. 1159-1168 ◽  
Author(s):  
Animesh Sinha ◽  
Nazrul Islam Khan ◽  
Subhankar Das ◽  
Jiawei Zhang ◽  
Sudipta Halder
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Polyethylene Glycol ◽  
Epoxy Resin ◽  
Mechanical Performance ◽  
Thermal And Mechanical Properties ◽  
Minor Variation ◽  
Reactive Diluents

The effect of reactive (polyethylene glycol) and non-reactive (toluene) diluents on thermal and mechanical properties (tensile strength, hardness and fracture toughness) of diglycidyl ether of bisphenol A epoxy resin (cured by triethylenetetramine) was investigated. The thermal stability and mechanical properties of the epoxy resin modified with reactive and non-reactive diluents at different wt% were investigated using thermo-gravimetric analyser, tensile test, hardness test and single-edge-notched bend test. A minor variation in thermal stability was observed for epoxy resin after addition of polyethylene glycol and toluene at 0.5 wt%; however, further addition of reactive and non-reactive diluents diminished the thermal stability. The addition of 10 wt% of polyethylene glycol in epoxy resin significantly enhances the tensile strength (∼12%), hardness (∼14%) and fracture toughness (∼24%) when compared to that of neat epoxy resin. In contrast, major drop in mechanical performance was observed after addition of toluene in epoxy. Furthermore, fracture surfaces were investigated under field emission scanning electron microscope to elucidate the failure mechanism.

The effects of various nanoparticles on the thermal and mechanical properties of an epoxy resin

2016 ◽  
Vol 20 (2) ◽  
pp. 145-150 ◽  
Author(s):  
J. Arbaoui ◽  
H. Moustabchir ◽  
J. R. Vigué ◽  
F. -X. Royer
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Thermal And Mechanical Properties
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