scholarly journals A new method in synthesis of polyurethane/graphite oxide nanocomposites by twin-screw extruder

2013 ◽  
Vol 16 (4) ◽  
pp. 45-53
Author(s):  
Van Thi Khanh Khuat ◽  
Tam Thanh Mai ◽  
Nhan Thuc Chi Ha ◽  
Huy Thuc Ha
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Graphene Oxide ◽  
Environmentally Friendly ◽  
Mechanical And Thermal Properties ◽  
Screw Extruder ◽  
Time Saving ◽  
Transmission Electron ◽  
Twin Screw ◽  
Environmentally Friendly Method

In this study, we have synthesized polyurethane based on monoglyceride and 4.4 '-diphenyl methanediisocyanate (MDI) – an environmentally friendly polymer. Graphene oxite (GO) was used to reinforce for polyurethane forming polyurethane/graphene oxide (PU/GO) nanocomposite. The synthesis of PU and PU/GO was performed directly on the twinscrew extruder. This is a simple, time saving, economical and environmentally friendly method. Nanocomposites were manufactured with GO phase changed from 0.5% to 1.5% by weight. Structural analysis results of PU/GO showed a good dispersion through TEM figure (transmission electron microscopy). In addition, the mechanical and thermal properties of the nanocomposite were improved as compared to the original polyurethane. This study is a new step for the synthesis of polyurethane and nanocomposite based on polyurethane by the melt intercalation method.

Environmentally Friendly Synthesis of Hydroxyapatite Nanoplates and their Adsorption Behavior of Proteins

2010 ◽  
Vol 113-116 ◽  
pp. 1036-1039
Author(s):  
Li Ying Li ◽  
Wen Hua Song ◽  
Jie Lian ◽  
Jin Hua Zhang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Environmentally Friendly ◽  
Adsorption Behavior ◽  
X Ray Diffraction ◽  
New Approach ◽  
X Ray ◽  
Transmission Electron ◽  
Hydroxyapatite Nanocrystals ◽  
Environmentally Friendly Method

By a environmentally friendly method with the control of anionic amino acid surfactant N-lauroylsarcosine sodium (Sar-Na), hydroxyapatite (HAP) nanoplates were synthesized and the adsorption behavior of bovine serum albumin (BSA) were carefully studied. The products were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Results showed that hydroxyapatite nanocrystals with lengths of 100 nm, a width of 10 nm and a high aspect ratio (10:1) were obtained. Results of UV-Vis spectrum indicate that prepared hydroxyapatite nanoplates can be effectively adsorbed BSA. The current work provides a new approach to produce biomaterials.

One-step synthesis of a suspended ultrathin graphene oxide film: Application in transmission electron microscopy

Micron ◽  
2015 ◽  
Vol 68 ◽  
pp. 23-26 ◽  
Author(s):  
D.A. Kirilenko ◽  
A.T. Dideykin ◽  
A.E. Aleksenskiy ◽  
A.A. Sitnikova ◽  
S.G. Konnikov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Graphene Oxide ◽  
Oxide Film ◽  
Transmission Electron ◽  
One Step

Changing width bandgap of TiO2 nanoparticles incorporating GO

MRS Advances ◽  
2019 ◽  
Vol 4 (61-62) ◽  
pp. 3423-3431
Author(s):  
Daniela K. Calvo-Ramos ◽  
Marina Vega-González ◽  
José Santos-Cruz ◽  
Francisco Javier De Moure-Flores ◽  
Sandra A. Mayén-Hernández
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Nir Spectroscopy ◽  
Improved Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

ABSTRACTNanoparticles of titanium dioxide (TiO2), synthesized by the sonochemical technique, were mixed with different amounts of graphene oxide (GO), obtained by the improved method of Hummer, in order to modify their bandwidth. The TiO2/OG compounds were characterized using different techniques: X-ray Diffraction (XRD), transmission electron microscopy (TEM), Raman and UV-Vis-NIR spectroscopy. TiO2 bandgap decreased, with GO incorporation, from 3.2 to 2.72 eV when GO was present at 20 weigh percentage (TiO2/GO-20%). Photodegradation experiments of methylene blue (MB) were performed with the materials to verify their photocatalytic activity. At 40 minutes, the pure TiO2 degraded 48% of MB, whereas the compound TiO2/GO-20% degraded 88%, showing a good incorporation of both compounds and the improvement of TiO2 photocatalitic properties.

Fabrication of the Ordered and Sandwich Structured Polyaniline/Graphene Nanoarrays

2010 ◽  
Vol 148-149 ◽  
pp. 1571-1574
Author(s):  
Qing Li Hao ◽  
Jiao Tian ◽  
Hua Lan Wang ◽  
Xin Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Electrochemical Tests ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Graphene Oxide Sheets ◽  
Scanning Electron

The ordered polyaniline nanoarrays had dispersed homogeneously on the graphene oxide or reduced graphene oxide sheets without agglomeratation in isopropanol media. The composites were characterized by field emission scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, Raman spectroscopy and electrochemical tests. The electrochemical performance of the electrode material had been dramatically improved with the highest specific capacitance of 1351 F/g.

Study on the Preparation, Structure and Performances of Antibacterial PET Masterbatch

2011 ◽  
Vol 311-313 ◽  
pp. 131-134 ◽  
Author(s):  
Wen Sheng Hou ◽  
Mei Niu ◽  
Jin Ming Dai ◽  
Sheng Shi ◽  
Zi Lu Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Antibacterial Agent ◽  
Adsorption Process ◽  
Average Diameter ◽  
Coulomb Force ◽  
Functional Material ◽  
Screw Extruder ◽  
E Coli ◽  
Transmission Electron ◽  
Twin Screw

The antibacterial PET (polyethylene terephthalate) masterbatch was extruded from twin screw extruder, using silver and zinc-loading Nano-SiO2 antibacterial agent (SLSZ) as the functional material. The content of SLSZ and extruding techniques were investigated. The dispersion and compatibility of antibacterial agent in antibacterial PET masterbatch were further characterized using Scanning Electron Microscopy and Transmission Electron Microscopy. The antibacterial performances and adsorption process of the antibacterial PET masterbatch against Escherichia coli (E. coli) were tested using alive-bacteria-counting method. The experimental results indicate that when the content of SLSZ was 30 wt. %, the antibacterial agent with an average diameter of 150nm showed excellent dispersion and compatibility in antibacterial PET masterbatch, and had excellent antibacterial performances. The adsorption process of antibacterial PET masterbatch against E. coli was controlled by Coulomb force between them. As the amount of the antibacterial PET masterbatch increased, the adsorbing rate and capacity were increased.

Properties of Polyacrylic Ester Emulsion Modified with Octa(nitrophenyl)silsesquioxane (ONPS)

2006 ◽  
Vol 11-12 ◽  
pp. 319-322
Author(s):  
Li Mei Hu ◽  
Qi Fang Li ◽  
Hai Ping Geng
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Tensile Strength ◽  
Nanometer Scale ◽  
29Si Nmr ◽  
Mechanical And Thermal Properties ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Polyacrylic Ester

Octaphenylsilsesquioxane (OPS) and Octa(nitrophenyl)silsesquioxane (ONPS) were synthesized by a conventional approach. The structure was characterized by FTIR, GPC, 1H NMR and 29Si NMR. Then ONPS was added into the latex to modify polyacrylic ester (PAE) emulsion. The compatibility, mechanical and thermal properties of modified PAE emulsion were investigated through di.erential scanning calorimetry (DSC), the tensile strength tester and transmission electron microscopy (TEM) micrographs.The studies on TEM and the particle size distribution showed that the Octa(nitrophenyl)silsesquioxane particles homogeneously disperse in the emulsion at a nanometer scale. Differential scanning calorimetry showed that the addition of ONPS increased Tg of PAE emulsion significantly. The tensile strength of films increased with the addition of ONPS, but rupture elongation decreased slightly. The general properties obtained optimum when the content of ONPS was 2∼3%.

The Improvement in Mechanical and Thermal Properties of Biodegradable Poly(Butylene Succinate) (PBS) Nanocomposites with Low Loadings of Graphene Oxide (XGO)

2016 ◽  
Vol 872 ◽  
pp. 235-241
Author(s):  
Achanai Buasri ◽  
Udon Kampichit ◽  
Panupong Salacharoen ◽  
Pouvadon Sangsawee ◽  
Vorrada Loryuenyong
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Thermal Properties ◽  
Mechanical Test ◽  
Mechanical And Thermal Properties ◽  
Butylene Succinate ◽  
Degradation Temperature ◽  
Transmission Electron ◽  
Uniform Dispersion ◽  
Biodegradable Poly

This research aims to study the physical, mechanical and thermal properties of poly (butylene succinate)/graphene oxide (PBS/XGO) nanocomposites. The polymer nanocomposites were successfully prepared by solution processing in conjunction with compression molding at various contents of XGO from 0-1.0 wt%. The structure, tensile properties and thermal stability of materials have been investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), mechanical test, and thermogravimetric analysis. The results revealed that PBS and XGO could mix with each other homogeneously, and uniform dispersion of XGO in the PBS matrix occurred when the filler content was less than 1.0 wt%. Young′s modulus and degradation temperature (Td) of biopolymer were greatly improved by the addition of a small amount of XGO (1.0 wt%). The nanocomposites have potential application as packing materials.

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