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Ianchis R.,National Institute of Chemical and Petrochemical Research and Development | Donescu D.,National Institute of Chemical and Petrochemical Research and Development | Corobea M.C.,National Institute of Chemical and Petrochemical Research and Development | Nistor C.L.,National Institute of Chemical and Petrochemical Research and Development | And 4 more authors.
Optoelectronics and Advanced Materials, Rapid Communications | Year: 2011

We report the synthesis of superhydrophobic clay minerals by grafting a monofunctional alkoxysilane -trimethylethoxysilane on different organomodified montmorillonites. The structure of the montmorillonites was changed as evidenced by TGA, FTIR, DLS and X-Ray fluorescence analyses that confirmed the successful functionalisation.


Ilie C.,Ilie Murgulescu Institute of Physical Chemistry | Stitinga G.,Ilie Murgulescu Institute of Physical Chemistry | Iovescu A.,Ilie Murgulescu Institute of Physical Chemistry | Purcar V.,National Institute of Chemical and Petrochemical Research and Development | And 2 more authors.
Revue Roumaine de Chimie | Year: 2010

Mixtures of Carbopol 980 [a cross-linked poly(acrylic acid) (PAA)] and poly(ethylene glycol) (PEG) of 400 2000 and 8000 molecular weights were investigated by ATR FTIR spectroscopy. The spectra were different of those of the individual components and prove interpolymer complex (IC) formation through hydrogen bondings. The effect of nonionic surfactants , [i.e., polydisperse ethoxylated nonylphenol (NPEO10) and ethylene oxide-propylene oxide-ethylene oxide (EO76-PO30-EO76) triblock copolymer (Pluronic F68)] on Carbopol 980/PEG mixtures was studied by surface tension, viscosity and pH methods. The CMC and several critical concentrations for surfactant interaction with IC were determined. The data were discussed taking into account the interaction of both the ethoxylated and the hydrophobic moieties of the surfactant with IC and their competition with PEG for the binding sites of Carbopol.


Ilie C.,Ilie Murgulescu Institute of Physical Chemistry | Iancu S.,National Institute of Chemical and Petrochemical Research and Development | Duldner M.,National Institute of Chemical and Petrochemical Research and Development | Anghel D.F.,Ilie Murgulescu Institute of Physical Chemistry
Revue Roumaine de Chimie | Year: 2011

The paper presents results concerning copolyesters made from recycled poly(ethylene terephthalate) (PET) wastes, ethylene and diethylene glycol (EG and DEG), isosorbide (ISOS), adipic and succinic acid (AA and SA), and 1,3-dimethyl isophthalate 5-sodium sulfonate (DMIS). AA and AS are used to induce biodegradability, DMIS gives water dispersability, whereas ISOS significantly improves the physico-chemical and thermal properties of the copolyesters. In addition, ISOS derives from biomass that is a renewable source. The samples are characterized by 1H-NMR, FTIR-ATR and UV-Vis proving the presence of aromatic and aliphatic protons, of ester and sulfonic groups, and of aromatic state. The copolyesters have good solubility in water, ethylene glycol and chloroform, and do not dissolve in alcohols, acetone and toluene. They give positive response to the qualitative test for surface active agents, but the surface tension measurements show only a feeble surfactant character. The reduced viscosity and turbidity data reveal that all the samples have polyelectrolyte features. These results demonstrate the hydrophilicity of the PET copolyesters, and recommend them as biodegradable, water-dispersible, film forming agents.


Somoghi R.,National Institute of Chemical and Petrochemical Research and Development | Ianchis R.,National Institute of Chemical and Petrochemical Research and Development | Ghiurea M.,National Institute of Chemical and Petrochemical Research and Development | Purcar V.,National Institute of Chemical and Petrochemical Research and Development | Donescu D.,National Institute of Chemical and Petrochemical Research and Development
Journal of Optoelectronics and Advanced Materials | Year: 2013

This work describes the possibility of obtaining latexes derived from hydrophobic modified magnetite nanoparticles (MNPs). The hydrophobic modification was achieved by functionalizing Fe3O4 particles with different monofunctional alkoxysilanes (methyl, octyl, octadecyl and phenyl). Polymerizations were performed through ultrasonic initiated miniemulsion in the presence of sodium dodecyl sulfate (SDS). The hydrophobic ferrite was dispersed in monomer (styrene) with hexadecane and decaethylene glycol oleyl ether (Brij 96 V). The resulted new materials were analyzed by DLS, FT-IR, SEM and TGA. The data show the influence of the hydrocarbon chain length of the alkoxysilanes on the final magnetic hybrids.


Ianchis R.,National Institute of Chemical and Petrochemical Research and Development | Donescu D.,National Institute of Chemical and Petrochemical Research and Development | Somoghi R.,National Institute of Chemical and Petrochemical Research and Development | Corobea M.C.,National Institute of Chemical and Petrochemical Research and Development | And 7 more authors.
Journal of Optoelectronics and Advanced Materials | Year: 2013

Stable nanocomposite latexes based on styrene with/without layered silicate using miniemulsion polymerization procedure, were obtained. The presence of the clays influences the average diameter of the particles and the size distribution, as it was shown by DLS analyses. In order to evidence the inorganic partner's presence as well as the intercalation/exfoliation of clay layers in the polymer matrix, FTIR and XRD analyses were performed. Thermal behavior of the obtained nanocomposites by TGA and DSC was followed. The morphology of the final latex was observed by ESEM.

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