Copolymers and Proton Conducting Films Based on N-Vinylpyrazole

2013 ◽  
Vol 749 ◽  
pp. 71-76 ◽  
Author(s):  
Oksana Lebedeva ◽  
Yury Pozhidaev ◽  
Evgenya Sipkina ◽  
Alexandra Chesnokova ◽  
Nikolay Ivanov
Keyword(s):  
Methyl Methacrylate ◽  
Radical Polymerization ◽  
Proton Conductivity ◽  
Vinyl Chloride ◽  
Sol Gel ◽  
Tetraethyl Orthosilicate ◽  
Proton Conducting ◽  
Inorganic Composites ◽  
Microstructure Parameters ◽  
Sol Gel Synthesis

The copolymers of N-vinylpyrazole with vinyl chloride and methyl methacrylate were obtained by radical polymerization. Constants reactivity and microstructure parameters of copolymers were calculated and their properties were studied. The sol-gel synthesis of obtained copolymers with tetraethyl orthosilicate results in a hybrid organic-inorganic composites. Films with proton conductivity to 7.8·10-3 S·sm-1 were formed on the basis the copolymers and composites.

Scalable Free-Radical Polymerization Based Sol-Gel Synthesis of SrTiO3 and its Photocatalytic Activity

2017 ◽  
Vol 2 (17) ◽  
pp. 4836-4842 ◽  
Author(s):  
Swapna Challagulla ◽  
Ravikiran Nagarjuna ◽  
Sounak Roy ◽  
Ramakrishnan Ganesan
Keyword(s):  
Photocatalytic Activity ◽  
Free Radical ◽  
Radical Polymerization ◽  
Sol Gel ◽  
Free Radical Polymerization ◽  
Sol Gel Synthesis

scholarly journals Proton-conducting Organic-inorganic Sulfo-containing Membranes for Fuel Cell

2021 ◽  
Author(s):  
Inga GRIGORAVICIUTE-PURONIENE ◽  
Iryna YEVCHUK ◽  
Oksana DEMCHYNA ◽  
Mariia ZHYHAILO ◽  
Khrystyna RYMSHA ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Sol Gel ◽  
Structural Heterogeneity ◽  
Silica Content ◽  
Inorganic Materials ◽  
Inorganic Component ◽  
Proton Conducting ◽  
Glycol Diacrylate ◽  
Silica Membranes ◽  
Component Content

Cross-linked organiс-inorganic sulfo-containing membranes of various compositions based on acrylic monomers (acrylonitrile, acrylic acid, 3-sulfopropylacrylate potassium salt, ethylene glycol diacrylate) and sol-gel systems of tetraethoxysilane have been developed. Synthesis of the polymer matrix was carried out by UV-initiated polymerization of the monomer mixture and the inorganic component was formed in situ while conducting the sol-gel process of the precursor. FTIR, SEM, EDS, DMA, impedance spectroscopy were used to characterize the synthesized materials. The influence of inorganic component content on the properties of the membranes was investigated. DMA results show that an increase in silica content leads to a decrease in packing density and an increase in structural heterogeneity in sulfo-containing polyacrylate/silica membranes. The highest values of proton conductivity 1.12 ꞏ 10−2 Sm/cm at 60 °C were found in membranes containing 3 wt.%. of the added sol-gel system. Further increase of silica content does not increase the proton conductivity of the membranes. The proton transfer activation energies in the membranes were calculated from the temperature dependence of proton conductivity. The obtained cross-linked sulfo-containing organic-inorganic materials can be used for the development of proton-conducting membranes for fuel cells.

The Influence on Proton Conductivity and Methanol Permeability of SiO2/PVA-PAMPS Composite Membrane

2012 ◽  
Vol 503-504 ◽  
pp. 625-628 ◽  
Author(s):  
Chun Hua Yuan ◽  
Gui Bao Guo ◽  
Sheng Li An
Keyword(s):  
Proton Conductivity ◽  
High Selectivity ◽  
Direct Methanol Fuel Cells ◽  
Sol Gel ◽  
Methanol Permeability ◽  
Electrolyte Membrane ◽  
Direct Methanol ◽  
Order Of Magnitude ◽  
Sol Gel Synthesis

Polyvinyl alcohol(PVA) modified by SiO2/poly 2-acrylamido 2-methylpropane sulfonic acid (PAMPS) electrolyte membrane (SiO2/PVA-PAMPS ) was prepared by a Sol-gel synthesis in situ technique for DMFC. The influence of the different ratio of AMPS and SiCl4 on the proton conductivity and methanol permeability of these membranes was studied using an impedance analyzer and a gas chromatograph. The results showed that with increasing of the content of silicon dioxide, the SiO2 was homogeneously distributed in the membrane. As the AMPS content increased, the proton conductivity of the SiO2/PVA-PAMPS membranes also increased. The swelling degree of the SiO2/PVA-PAMPS membrane with 30wt% SiCl4 and 20wt% AMPS was 28.79% at 25°C. The membranes possess a methanol permeability of around 10-7 cm2•S-1, which is about one order of magnitude lower than that of Nafion115. These membranes have high selectivity and are promising for use in direct methanol fuel cells (DMFC).

Sol-gel synthesis of ternary phosphate-ZrO2-SiO2 catalysts for alcohol dehydration

2001 ◽  
Vol 79 (8) ◽  
pp. 1224-1228 ◽  
Author(s):  
Quan Zhuang ◽  
Jack M Miller
Keyword(s):  
Key Words ◽  
Sol Gel ◽  
Acid Catalyst ◽  
Tetraethyl Orthosilicate ◽  
Mas Nmr ◽  
Alcohol Dehydration ◽  
Zirconium Propoxide ◽  
P Content ◽  
Sol Gel Synthesis ◽  
Cp Mas Nmr

Phosphate–ZrO2–Si2O catalysts were synthesized by sol-gel method using tributyl phosphite, zirconium propoxide, and tetraethyl orthosilicate as precursors. They were characterized by N2 adsorption, 31P CP MAS NMR, and DRIFTS. At lower P content, monomeric phosphates were formed on the surface of the catalysts, which were mainly responsible for the isopropanol dehydration activity. At higher P content, polyphosphates were formed, and thus, the dehydration activity decreased. An optimum P content for dehydration activity was found to be at 10 mol%.Key words: sol-gel synthesis, ternary oxides, phosphate, acid catalyst, alcohol dehydration, 31P CP MAS NMR, N2 adsorption, DRIFTS.

Sol–gel synthesis of Ta2O5–SiO2 composites from tantalum(V) chloride and tetraethyl orthosilicate in ethanol

2017 ◽  
Vol 53 (9) ◽  
pp. 994-1003 ◽  
Author(s):  
A. G. Mal’chik ◽  
S. A. Kuznetsova ◽  
S. O. Kryuchkova ◽  
V. V. Kozik
Keyword(s):  
Sol Gel ◽  
Tetraethyl Orthosilicate ◽  
Sol Gel Synthesis

scholarly journals Sol-Gel Synthesis of Proton-Conducting Amorphous Films Containing P2O5

1998 ◽  
Vol 106 (1232) ◽  
pp. 396-401 ◽  
Author(s):  
Kensuke MAKITA ◽  
Masayuki NOGAMI ◽  
Yoshihiro ABE
Keyword(s):  
Sol Gel ◽  
Amorphous Films ◽  
Proton Conducting ◽  
Sol Gel Synthesis
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