Effect of Surface Modification on Thermal Stability, Flexural Properties, and Impact Strength of Epoxy/Graphene Nanocomposites

2019 ◽  
Vol 40 (10) ◽  
pp. 991-996
Author(s):  
Fan‐Long Jin ◽  
Chun‐Liu Ma ◽  
Bao‐Tian Guo ◽  
Soo‐Jin Park
Keyword(s):  
Thermal Stability ◽  
Surface Modification ◽  
Impact Strength ◽  
Flexural Properties ◽  
Graphene Nanocomposites ◽  
Effect Of Surface

The effect of surface modification on thermal stability of nanodiamonds

2008 ◽  
Vol 30 (5) ◽  
pp. 305-310 ◽  
Author(s):  
G. P. Bogatyreva ◽  
M. A. Marinich ◽  
V. Ya. Zabuga ◽  
G. G. Tsapyuk ◽  
A. N. Panova ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Surface Modification ◽  
Thermal Stability Of ◽  
Effect Of Surface

scholarly journals The Processing of Epoxy/1 wt%-graphene Nanocomposites: Effects of Ethanol on Flexural Properties

2019 ◽  
Vol 9 (1) ◽  
pp. 5440-5444 ◽  
Keyword(s):  
Impact Strength ◽  
Vickers Microhardness ◽  
Flexural Properties ◽  
Solution Casting ◽  
Sem Images ◽  
Maximum Increase ◽  
Graphene Nanocomposites ◽  
Casting Technique ◽  
Different Types ◽  
Solution Casting Technique

Four different types of nanocomposites were successfully produced using solution casting technique. Graphene was dispersed in four different ethanol concentrations; 0g, 1g, 2.5g, and 5g. In general, it can be observed that ethanol is an excellent agent for 1 wt% graphene dispersed in the epoxy matrix. The maximum increase in flexural properties, impact strength and microhardness were observed in 1 wt% graphene dispersed in 1g ethanol. The flexural strength and modulus increased by 62% and 61% respectively. The highest impact strength was recorded for 1 wt% graphene dispersed with 1g ethanol, where an improvement of 9.5% was observed. The maximum Vickers microhardness was recorded to improve 3% compared to monolithic epoxy. SEM images revealed that graphene can impede the advancing cracks and significantly change the fracture mode from a straight fracture path to radially emanated path. It is worth to point out that if ethanol is not completely evaporated during processing, it can cause porosity which is unfavourable to the mechanical properties of the nanocomposites.

Effect of Nanoparticles on the Thermal Stability of Polymers

2005 ◽  
Vol 887 ◽  
Author(s):  
Juan González-Irun ◽  
Ana Garcia ◽  
Ramón Artiaga ◽  
Luís Liz-Marzán ◽  
David Hui ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Surface Modification ◽  
Temperature Dependence ◽  
Silica Nanoparticles ◽  
Polymer Matrix ◽  
Surface Functionalization ◽  
Modest Increase ◽  
Thermal Stability Of ◽  
Effect Of Surface

ABSTRACTThe thermal stability of polymethylmethacrylate loaded with silica nnaoparticles is investigated. The temperature dependence of the mass has been accurately fitted with a single Boltzmann-like dependence. The effect of surface functionalization, size of silica nanoparticles, and concentration of silica nanoparticles is analyzed. A weak increase of the thermal stability of polymethylmethacrylate has been obtained by loading the polymer matrix with nanoparticles. Surface functionalization produced a modest increase in the thermal stability (compared to composites with silica nanoparticles without surface modification).

scholarly journals Thermal Degradation Kinetics and Modeling Study of Ultra High Molecular Weight Polyethylene (UHMWP)/Graphene Nanocomposite

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1597
Author(s):  
Iman Jafari ◽  
Mohamadreza Shakiba ◽  
Fatemeh Khosravi ◽  
Seeram Ramakrishna ◽  
Ehsan Abasi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Thermal Degradation ◽  
High Molecular Weight ◽  
Degradation Kinetics ◽  
Graphene Nanosheets ◽  
Thermal Degradation Kinetics ◽  
Graphene Nanocomposites ◽  
Kinetics Of ◽  
Ultra High Molecular Weight

The incorporation of nanofillers such as graphene into polymers has shown significant improvements in mechanical characteristics, thermal stability, and conductivity of resulting polymeric nanocomposites. To this aim, the influence of incorporation of graphene nanosheets into ultra-high molecular weight polyethylene (UHMWPE) on the thermal behavior and degradation kinetics of UHMWPE/graphene nanocomposites was investigated. Scanning electron microscopy (SEM) analysis revealed that graphene nanosheets were uniformly spread throughout the UHMWPE’s molecular chains. X-Ray Diffraction (XRD) data posited that the morphology of dispersed graphene sheets in UHMWPE was exfoliated. Non-isothermal differential scanning calorimetry (DSC) studies identified a more pronounced increase in melting temperatures and latent heat of fusions in nanocomposites compared to UHMWPE at lower concentrations of graphene. Thermogravimetric analysis (TGA) and derivative thermogravimetric (DTG) revealed that UHMWPE’s thermal stability has been improved via incorporating graphene nanosheets. Further, degradation kinetics of neat polymer and nanocomposites have been modeled using equations such as Friedman, Ozawa–Flynn–Wall (OFW), Kissinger, and Augis and Bennett’s. The "Model-Fitting Method” showed that the auto-catalytic nth-order mechanism provided a highly consistent and appropriate fit to describe the degradation mechanism of UHMWPE and its graphene nanocomposites. In addition, the calculated activation energy (Ea) of thermal degradation was enhanced by an increase in graphene concentration up to 2.1 wt.%, followed by a decrease in higher graphene content.

Effect of surface modification of WO3nanostructures on the performance for p-Si/n-WO3structure diodes

2021 ◽  
pp. 108695
Author(s):  
B. Gowtham ◽  
V. Ponnuswamy ◽  
J. Chandrasekaran ◽  
V. Balasubramani ◽  
R. Suresh ◽  
...  
Keyword(s):  
Surface Modification ◽  
Effect Of Surface

scholarly journals Effect of Surface Modification on the Photocatalysis of Ti-Ni Alloy in Orthodontics

2007 ◽  
Vol 26 (6) ◽  
pp. 924-929 ◽  
Author(s):  
Yosuke HORIUCHI ◽  
Mariko HORIUCHI ◽  
Takao HANAWA ◽  
Kunimichi SOMA
Keyword(s):  
Surface Modification ◽  
Ni Alloy ◽  
Effect Of Surface
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