Microemulsions of a Vinyl Acetate/2-Ethylhexyl Acrylate Monomer Mixture

Donescu, Dan; Vasilescu, Marilena; Fusulan, and Liana; Petcu, Cristian

doi:10.1021/la970700q

Cited by 10 publications

(10 citation statements)

References 27 publications

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“…The nonlinear behavior of this ratio is evidence for the nanostructuring of ANIHCl in solution through the association of phenyl groups and the formation of hydrophobic regions. These results are in a good agreement with those previously reported for mixtures of alcohols, acrylic acid, and other compounds [19,20]. Note that at a concentration of 24 mM, ANIHCl begins to aggregate in water.…”

Section: Resultssupporting

confidence: 92%

“…In this paper, we gathered more information on this topic using fluorescence studies, which were efficient for demonstrating the nanostructuring of the cosurfactants with short alkyl chains [19,20]. Therefore, pyrene was used as the fluorescence probe because its emission changes with the polarity of the medium where it is solubilized.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, pyrene was used as the fluorescence probe because its emission changes with the polarity of the medium where it is solubilized. A decrease in the I 1 /I 3 signals indicated that a more hydrophobic microenvironment is sensed by pyrene and revealed the nanostructuring of compounds solubilized in water [19,20,23,24].…”

Section: Resultsmentioning

confidence: 99%

“…In previous studies [19,20], we have demonstrated that in aqueous solutions, the organic compounds with hydrophilic groups, such as OH or COOH and short alkyl chains (C 1 -C 4 ), are nanostructured in water. The hydrophobic regions, which can solubilize sparingly organic compounds in water, were formed through these aggregates.…”

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

1D-polyaniline starting from self-assembled systems

Donescu¹,

Ghiurea²,

Spataru³

et al. 2015

Colloid Polym Sci

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The radical polymerization of aniline hydrochloride (ANIHCl) in the presence of ammonium persulfate was studied. 1D-Polyaniline (PANI) with fibrillar morphologies was obtained in the presence of anionic surfactants. The changes of the PANI-template structures in aqueous solution were studied using static fluorescence measurements. The dispersed PANI nanoparticles were characterized using dynamic light scattering, scanning electron microscopy (SEM), and Raman and Fourier transform infrared spectroscopies. The thermal analysis and the electrical conductivity of the dried samples were also performed. The fluorescence measurements indicated that nanocrystals of ANIHCl form in water complexes with the anionic surfactants at smaller concentrations than the critical micellar concentration. The same method revealed that other organic complexes with sulfonate groups do not induce an increase of the hydrophobic region due to short hydrocarbon tails. The SEM micrographs and Raman spectra revealed that the PANI nanofibers are compact and different compared to the nanoparticles prepared without surfactants.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

1D-polyaniline starting from self-assembled systems

Donescu¹,

Ghiurea²,

Spataru³

et al. 2015

Colloid Polym Sci

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“…mixtures are shown in In order to extract new informations regarding the solubilization mechanism of the monomers in the microemulsions, the¯uorescence probe method was considerate appropriate (1,4). mixtures are shown in In order to extract new informations regarding the solubilization mechanism of the monomers in the microemulsions, the¯uorescence probe method was considerate appropriate (1,4).…”

Section: Resultsmentioning

confidence: 99%

The Influence of Monomers upon Microemulsions with Short Chain Cosurfactant

Donescu

Fusulan

Vasilescu³

et al. 2001

Journal of Dispersion Science and Technology

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Several monomers (i.e., acrylonitrile (ACN), ethyl acrylate (EtA), acrylate of 2 ethylhexyl (EHA), butyl acrylate (BuA), vinyl acetate (VAc), methyl methacrylate (MMA) and styrene (St)) were investigated in order to study their capacities to form microemulsions. The surfactant was nonyl phenol ethoxylate with 25 moles ethylene oxide and ethanol was used as the cosurfactant. The phase diagrams prove that the capacity for microemulsion formation varies in the following sequence:Conductometric and refractometric studies allowed us to evidence the formation of microemulsions with WaO, bicontinuous or OaW structure. Fluorescence studies give interesting informations on the stabilization capacity of the monomers dispersed by interaction with hydrophobic chain of the cosurfactant. H-NMR studies suggest that the monomers in microemulsions lie in regions with various polarities as function of their chemical nature. In polymerization initiated with benzoyl peroxide the minimum conversions were obtained in zones of composition where the initial microemulsions possess a bicontinuous microstructure. The reactions of degradative transfer of the increasing macroradicals account for these conversion modi®cations. For initiation with ammonium persulphate, its rate of decomposition depends on its ability to displace the proton bonded to the substituted vinylic carbon of the monomer. The productivity of this initiator varies within the sequence MMAThe consumption of the initiator, as induced by the monomer, depends on its chemical nature and on the solubilization site of the microemulsions. 231

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Emulsion copolymerization of vinyl acetate and 2‐ethyl hexyl acrylate using nonionic emulsifiers in loop reactor

Sarac

Keklik

Yıldız

et al. 2005

J of Applied Polymer Sci

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Batch emulsion copolymerization of vinyl acetate and 2-ethyl hexyl acrylate (VAc/2EHA ϭ 90 : 10) was initiated by the thermal initiators ammonium persulfate and potassium persulfate at 70°C in the presence of nonylphenol ethoxylates with varying chain lengths and poly(vinyl alcohol). VAc-2EHA copolymer latexes were synthesized as two different series in a loop reactor. The first series was initiated by ammonium persulfate, and the second series was initiated by potassium persulfate. The influence of the counterions or initiators and chain lengths of a nonionic emulsifier on the properties of VAc-2EHA copolymer latexes were determined by measuring the viscosities, weight-average molecular weights, number-average molecular weights, molecular weight distribution, and surface tension of latexes to air. The results for the copolymer latexes indicated that some of their physicochemical properties increased with increasing chain length of the nonionic emulsifier, but some of them followed a different trend for the two initiators.

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Microemulsions of a Vinyl Acetate/2-Ethylhexyl Acrylate Monomer Mixture

Cited by 10 publications

References 27 publications

1D-polyaniline starting from self-assembled systems

1D-polyaniline starting from self-assembled systems

The Influence of Monomers upon Microemulsions with Short Chain Cosurfactant

Emulsion copolymerization of vinyl acetate and 2‐ethyl hexyl acrylate using nonionic emulsifiers in loop reactor

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