Effect of Electron Beam Irradiation Crosslinking on PVA Films

2014 ◽  
Vol 852 ◽  
pp. 304-308
Author(s):  
Guo Liang Dai ◽  
Hong Xiao ◽  
Shi Feng Zhu ◽  
Mei Wu Shi
Keyword(s):  
Electron Beam ◽  
Irradiation Dose ◽  
Electron Beam Irradiation ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Beam Irradiation ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
X Ray

Electron beam irradiation cross-linking of polyvinyl alcohol (PVA) films with the presence of N, N'- methylene bisacrylamide (MBA) were studied, improving the thermal stability. The films unirradiated and irradiated were characterized by ATR-FTIR spectroscopy, X-ray diffraction, differential scanning calorimetry and thermo gravimetric analysis. The PVA films with the presence of MBA would crosslink after irradiation. The crystallinity increased firstly and then decreased as a function of irradiation dose, while the melting temperature decreased with increasing the dose. Beside, the T30%, T50%, T90% and Tmax temperature of degradation increased as the irradiation dose increased.

The Influence of Calcination Temperature on Quantitative Phase of Hematite from Iron Stone Tanah Laut

2015 ◽  
Vol 1112 ◽  
pp. 489-492
Author(s):  
Ali Mufid ◽  
M. Zainuri
Keyword(s):  
Particle Size ◽  
Calcination Temperature ◽  
Thermo Gravimetric Analysis ◽  
Precipitation Method ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Particle Size Analyzer ◽  
Co Precipitation

This research aims to form particles of hematite (α-Fe2O3) with a basis of mineral iron ore Fe3O4 from Tanah Laut. Magnetite Fe3O4 was synthesized using co-precipitation method. Further characterization using X-ray fluorescence (XRF) to obtain the percentage of the elements, obtained an iron content of 98.51%. Then characterized using thermo-gravimetric analysis and differential scanning calorimetry (TGA-DSC) to determine the calcination temperature, that at a temperature of 445 °C mass decreased by 0.369% due to increase in temperature. Further Characterization of X-ray diffraction (XRD) to determine the phases formed at the calcination temperature variation of 400 °C, 445 °C, 500 °C and 600 °C with a holding time of 5 hours to form a single phase α-Fe2O3 hematite. Testing with a particle size analyzer (PSA) to determine the particle size distribution, where test results indicate that the α-Fe2O3 phase of each having a particle size of 269.7 nm, 332.2 nm, 357.9 nm, 412.2 nm. The best quantity is shown at a temperature of 500 °C to form the hematite phase. This result is used as the calcination procedure to obtain a source of Fe ions in the manufacture of Lithium Ferro Phosphate.

scholarly journals Synthesis of a novel magnetic polyacrylamide coagulant and its application in wastewater purification

2016 ◽  
Vol 75 (3) ◽  
pp. 581-586 ◽  
Author(s):  
Zheng Zhou ◽  
Aiqin Shan ◽  
Yuxia Zhao
Keyword(s):  
Suspended Solids ◽  
Removal Rate ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Wastewater Purification ◽  
Thermo Gravimetric ◽  
Turbidity Removal ◽  
X Ray ◽  
Magnetite Fe3o4

In this study, a novel magnetic polyacrylamide (PAM) coagulant based on the core of magnetite (Fe3O4), with oleic acid serving as modifier and acrylamide as monomer, was synthesized to remove suspended solids in kaolin-suspended water. The composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermo gravimetric analysis and scanning electron microscopy. The results demonstrated that 82.8% of turbidity removal rate was obtained in 5 min of static settling in simulated kaolin-suspended water. This proved to be superior to that of PAM and poly aluminum chloride. Also confirmed in this study was the fact that zeta potential was significantly correlated with turbidity removal.

scholarly journals Effects of Electron Beam Irradiation on the Mechanical, Thermal, and Surface Properties of Some EPDM/Butyl Rubber Composites

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1206 ◽  
Author(s):  
Maria Stelescu ◽  
Anton Airinei ◽  
Elena Manaila ◽  
Gabriela Craciun ◽  
Nicusor Fifere ◽  
...  
Keyword(s):  
Electron Beam ◽  
Irradiation Dose ◽  
Electron Beam Irradiation ◽  
Contact Angles ◽  
Butyl Rubber ◽  
Attenuated Total Reflection ◽  
Beam Irradiation ◽  
Rubber Composites ◽  
Scanning Calorimetry ◽  
Wide Range

The effects of electron beam irradiation on the properties of ethylene propylene diene monomer (EPDM)/butyl rubber composites in presence of a polyfunctional monomer were investigated by means of differential scanning calorimetry (DSC), thermal analysis, scanning electron microscopy (SEM), attenuated total reflection absorption infrared spectroscopy (ATR-IR), and mechanical and surface energy measurements. The samples were exposed over a wide range of irradiation doses (20–150 kGy). The EPDM matrix was modified with butyl rubber, chlorobutyl rubber, and bromobutyl rubber. The gel content and crosslink density were found to increase with the electron beam irradiation dose. The values of the hardness and modulus increased gradually with the irradiation dose, while the tensile strength and elongation at break decreased with increasing irradiation dose. The EPDM/butyl rubber composites presented a higher thermal stability compared to the initial EPDM sample. The incorporation of butyl rubbers into the EPDM matrix led to an increase in material hydrophobicity. A similar trend was observed when the irradiation dose increased. The greatest change in the surface free energy and the contact angles occurs at an irradiation dose of 20 kGy. The Charlesby–Pinner plots prove the tendency to crosslinking as the irradiation dose increases.

Study of Pseudoboehmite Synthesis by Sol-Gel Process

2006 ◽  
Vol 45 ◽  
pp. 260-265 ◽  
Author(s):  
Antônio Hortêncio Munhoz Jr. ◽  
Leila Figueiredo de Miranda ◽  
G.N. Uehara
Keyword(s):  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Ammonium Hydroxide ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Sol Gel Process ◽  
Different Temperatures ◽  
Sol Gel Synthesis

A pseudoboehmite was obtained by sol-gel synthesis using aluminum nitrate as precursor. It was used a 2n full factorial design for studying the effect of the temperature of synthesis, the concentration of ammonium hydroxide, and the radiation dose in the product of sol-gel synthesis. The product of the synthesis was analyzed by scanning electron microscopy, x-ray diffraction of the product (after firing the pseudoboehmite at different temperatures), and it was also analyzed the temperature of endothermic and exothermic transformations using the thermo gravimetric analysis (TG) and differential scanning calorimetry (DSC). The X-ray diffraction data show that α-alumina was obtained at 1100o C.

Thermal and Structural of Methyl Cellulose

2014 ◽  
Vol 979 ◽  
pp. 307-310 ◽  
Author(s):  
W. Siriprom ◽  
S. Kongsriprapan ◽  
K. Teanchai
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermo Gravimetric Analysis ◽  
Methyl Cellulose ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Biodegradable Film ◽  
Thermo Gravimetric ◽  
X Ray ◽  
The Fourier Transform

The present study aims to investigate the physicochemical properties of the methyl cellulose. The information of this investigate has been used to reference in preparing biodegradable film. It was observed that the Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy show the hydrogen bond’s formation and the Energy Dispersive X-Ray Fluorescence (EDXRF) show the chemical and level of the composition element, which Copper (Cu) has the highest accumulate. Another that, the XRD spectra which investigated by X-Ray Diffraction (XRD) show the methyl cellulose had lowered crystalline. Another that, the Thermo-Gravimetric Analysis (TGA) was used to investigate the effect of heating and influence of thermal.

Thermo Gravimetric Analysis Study of PMMA/TiO2 Nanocomposites

2013 ◽  
Vol 832 ◽  
pp. 816-820
Author(s):  
N.N. Hafizah ◽  
Mohamad Hafiz Mamat ◽  
Mohd Hanafiah Abidin ◽  
Che Mohd Som Said ◽  
Mohamad Rusop
Keyword(s):  
Thermal Decomposition ◽  
Particle Size ◽  
Thermo Gravimetric Analysis ◽  
Polymer Chains ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Analysis Study ◽  
X Ray ◽  
Filler Size

The polymer matrix of poly (metyl methacrylate) (PMMA) has been introduced with the titanium dioxide (TiO2) nanopowder to study the effects of the TiO2size on the properties of the nanocomposites. The particle size is playing an important role in determining the properties of the nanocomposite. The decrease the filler size has increase the thermal decomposition of the nanocomposites due to the higher amount of the filler between the polymer chains. The results of X-ray diffraction (XRD) and Energy Dispersive X-Ray Spectrometry (EDS) also were discussed in this paper.

Synthesis of LiFePO4 Cathode Materials by a Chemical Method

2011 ◽  
Vol 197-198 ◽  
pp. 1049-1052
Author(s):  
Yuan Sun ◽  
Xiu Juan Zhao ◽  
Guo Jun Li ◽  
Rui Ming Ren
Keyword(s):  
Chemical Method ◽  
Single Phase ◽  
Raw Materials ◽  
Thermo Gravimetric Analysis ◽  
Precipitation Method ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Co Precipitation

The olivine-type LiFePO4powder was prepared by a chemical method using the synthesized FePO41.78H2O, LiOH, citric acid and PEG as raw materials. The synthesized FePO41.78H2O precursor powder was obtained by co-precipitation method. LiFePO4powder was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermo-gravimetric analysis (TGA)/differential scanning calorimetry (DSC). The results showed that the calcined LiFePO4was in a single phase when fabricated by using the synthesized FePO41.78H2O powder at pH of 3.5 in argon atmosphere.

Preparation of α-Al2O3 Powders via Non-Hydrolytic Sol-Gel Method

2015 ◽  
Vol 1104 ◽  
pp. 3-8 ◽  
Author(s):  
Tong Qing Zhou ◽  
Ting Chen ◽  
Wei Hui Jiang ◽  
Jian Min Liu ◽  
Xiao Jun Zhang ◽  
...  
Keyword(s):  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Raw Material ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
X Ray ◽  
Corundum Structure ◽  
Transmission Electron ◽  
Peg 600

Corundum structurealumina (α-Al2O3) powders were prepared via a non-hydrolytic sol-gel (NHSG) method using aluminum as raw material, ethanol as solvent, and iodine as catalyst. X-ray diffraction (XRD), differential thermal analysis (DTA), thermo gravimetric analysis (TG) were used to characterize the crystal phase of the products, while scanning electron microscopy (SEM) and transmission electron microscope (TEM) were employed to analyze the morphology. The results indicated that γ-Al2O3 was completely changed to α-Al2O3 at 1100 o C with a bit of aggregation. When 3 wt.% polyethylene glycol 600 (PEG 600) was introduced on the NHSG process, the dispersion was improved and the particle size decreased to100 nm.

Preparation and Stabilization of Chitosan-Lipase Composite within Mesoporous Silica Material

2007 ◽  
Vol 124-126 ◽  
pp. 1717-1720 ◽  
Author(s):  
Sun Sang Kwon ◽  
Sang Hoon Jeon ◽  
Jeong Kuk Shon ◽  
Duck Hee Kim ◽  
Ih Seop Chang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Lipase Activity ◽  
Thermo Gravimetric Analysis ◽  
Porous Silica ◽  
Gravimetric Analysis ◽  
Practical Application ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
X Ray ◽  
Silica Material

To improve lipase activity and make the particulate carrier for practical application, lipase was conjugated to chitosan(Mwavg=80,000) by immine reaction. The lipase activity of conjugate was 93% of its initial activity at room temperature for 7 months, whereas the intact lipase activity decreased to 40%. And then, lipase-chitosan conjugate was intercalated within porous silica. The composite was characterized by X-ray diffraction, scanning electron microscopy, thermo gravimetric analysis. The Pore size was regulated in the range of 5~15nm. The maximum enzyme activity of lipase-chitosan conjugate needs the structure with 15nm pore of mesoporous silica. The resultant composite was found to have the free flowing property and keep up inner lipase activity.

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