scholarly journals Synthesis and characterization of new biodegradable gels based on 2,2 '-(ethylenedioxy) diethanethiol and pentaerythritol triacrylate

2022 ◽  
Vol 320 (1) ◽  
pp. 25-31
Author(s):  
R.A. Shulen ◽  
◽  
D.S. Kazybayeva ◽  
Keyword(s):  
Raman Spectroscopy ◽  
Ir Spectroscopy ◽  
Sol Gel ◽  
Polymer Network ◽  
Crosslinking Density ◽  
Mechanical Analysis ◽  
Synthesis And Characterization ◽  
Prolonged Release ◽  
Click Polymerization

The work is devoted to the synthesis and characterization of gels based on the monomers pentaerythritol triaacrylate (PETriA) and 2,2 '-(ethylenedioxy)diethanethiol (EDODET) by thiol-ene "click" polymerization. The properties of the obtained gels were investigated by IR, Raman spectroscopy, mechanical analysis. Sol-gel analysis of obtained networks was carried out and the degradability was investigated. The results of IR spectroscopy confirmed the presence of -C = O and -C-O-C- groups in the composition of the obtained gels. The presence of unreacted C = C bonds conjugated with C = O, as well as thiol groups, varies depending on the composition of the initial monomer mixture (IMM). Raman spectroscopy results correlate well with IR data. Raman spectra also show C-S, S-S and SH characteristic bands that are difficult to identify by IR spectroscopy. It was found that the composition of MM affects the physicochemical properties of the synthesized gels. The highest yield of the gel fraction of obtained polymers was found in samples with an equimolar composition of IMM. The analysis of mechanical properties showed that gels with an excess of PETriA exhibit more elastic properties, and an excess of EDODET leads to the formation of networks with a higher crosslinking density. The study of the ability of obtained PETria-EDODET gels to degrade in a 3% solution of hydrogen peroxide showed that the polymer network degrades by 12% within 60 days. This property of the obtained gels can find application in the creation of targeted drug delivery systems with their prolonged release.

scholarly journals Synthesis of Polymetallic Oxides with High Organized Structure

2015 ◽  
Vol 23 (2) ◽  
pp. 77-90
Author(s):  
Anca Mihaela Dumitrescu ◽  
Victor Jucan ◽  
Alexandra Raluca Iordan ◽  
Mircea Nicolae Palamaru
Keyword(s):  
Magnetic Properties ◽  
Ir Spectroscopy ◽  
Lattice Structure ◽  
Sol Gel ◽  
Three Dimensional ◽  
Morphological Structure ◽  
Synthesis And Characterization ◽  
Dimensional Lattice ◽  
Porous Microstructure

Abstract The synthesis and characterization of high organized and nanostructured polymetallic oxides were studied. The samples were synthesized by sol-gel autocombustion method, using glycine as chelating/fuel agent and polyacrylamide-based hydrogel as template agent. This polymer has a porous microstructure with well-individualized and regularly-dispersed pores. The asobtained samples were characterized by IR spectroscopy, XRD, SEM. The magnetic properties were studied. As-synthesized polymetallic oxides have the morphological structure given by the three-dimensional lattice structure of hydrogel used as template agent

Synthesis and Characterization of Porous Crosslinked Copolymers for Oil Spill Sorption

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Abdel-Azim A. Abdel-Azim ◽  
A. Mahmoud Abdul-Raheim ◽  
Ayman Mohamady Atta ◽  
Witold Brostow ◽  
A. Fawzy El-Kafrawy
Keyword(s):  
Oil Spills ◽  
Crosslinking Density ◽  
Mechanical Analysis ◽  
Synthesis And Characterization ◽  
Scanning Calorimetry ◽  
Monomer Feed ◽  
Crosslinked Networks ◽  
Thermal Stability Of ◽  
Scanning Electron

AbstractCinnamoyloxy ethyl methacrylate (CEMA) was copolymerized with different monomer feed ratios of octadecyl acrylate (ODA) and crosslinked using azobisisobutyronitrile (AIBN) as the initiator and N,N’,N”-trisacryloyl melanine (AM) or N,N’,N”,-trismethacryloylmelanine (MM) crosslinkers. The networks are characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). For crosslinked CEMA/ODA copolymer sol fraction values are lower when MM is used rather than AM. The thermal stability of crosslinked network increases with increasing ODA concentration and also in the presence of MM crosslinker, a consequence of higher crosslinking density. SEM results show a porous structure; micropores are formed when ODA contents increases. According to DMA results, the flexibility of the network is enhanced by incorporation of MM rather than AM. Since our crosslinked networks are both flexible and porous, they are applicable as oil sorber networks to alleviate pollution from oil spills.

Synthesis and characterization of BaMgAl10O17:Eu phosphors derived by sol–gel processing

2002 ◽  
Vol 126 (2) ◽  
pp. 161-165 ◽  
Author(s):  
Junying Zhang ◽  
Zhongtai Zhang ◽  
Zilong Tang ◽  
Zishan Zheng ◽  
Yuanhua Lin
Keyword(s):  
Sol Gel ◽  
Synthesis And Characterization ◽  
Gel Processing

Synthesis and characterization of hydrogen-selective sol–gel SiO2 membranes supported on ceramic and stainless steel supports

2014 ◽  
Vol 121 ◽  
pp. 20-29 ◽  
Author(s):  
Tim Van Gestel ◽  
Felix Hauler ◽  
Martin Bram ◽  
Wilhelm A. Meulenberg ◽  
Hans Peter Buchkremer
Keyword(s):  
Stainless Steel ◽  
Sol Gel ◽  
Synthesis And Characterization

scholarly journals Synthesis and Characterization of Mixed Metal Oxide Nanocomposite Energetic Materials

2003 ◽  
Vol 800 ◽  
Author(s):  
Brady J. Clapsaddle ◽  
Lihua Zhao ◽  
Alex E. Gash ◽  
Joe H. Satcher ◽  
Kenneth J. Shea ◽  
...  
Keyword(s):  
Mass Transport ◽  
Metal Oxide ◽  
Energetic Materials ◽  
Silicon Oxide ◽  
Sol Gel ◽  
Synthesis And Characterization ◽  
Mixed Metal Oxide ◽  
Organic Additives ◽  
Metal Oxide Silicon

ABSTRACTIn the field of composite energetic materials, properties such as ingredient distribution, particle size, and morphology, affect both sensitivity and performance. Since the reaction kinetics of composite energetic materials are typically controlled by the mass transport rates between reactants, one would anticipate new and potentially exceptional performance from energetic nanocomposites. We have developed a new method of making nanostructured energetic materials, specifically explosives, propellants, and pyrotechnics, using sol-gel chemistry. A novel sol-gel approach has proven successful in preparing metal oxide/silicon oxide nanocomposites in which the metal oxide is the major component. Two of the metal oxides are tungsten trioxide and iron(III) oxide, both of which are of interest in the field of energetic materials. Furthermore, due to the large availability of organically functionalized silanes, the silicon oxide phase can be used as a unique way of introducing organic additives into the bulk metal oxide materials. As a result, the desired organic functionality is well dispersed throughout the composite material on the nanoscale. By introducing a fuel metal into the metal oxide/silicon oxide matrix, energetic materials based on thermite reactions can be fabricated. The resulting nanoscale distribution of all the ingredients displays energetic properties not seen in its microscale counterparts due to the expected increase of mass transport rates between the reactants. The synthesis and characterization of these metal oxide/silicon oxide nanocomposites and their performance as energetic materials will be discussed.

Sign in / Sign up

Export Citation Format

Share Document