Synthesis and Characterization of Polystyrene, Poly(butyl acrylate)-Layered Silicates Nanocomposites by Polymerization in Anionic Microemulsions

Donescu, Dan; Corobea, Mihai Cosmin; Capek, Ignác; Radovici, Constantin; Şerban, S.; Petcu, Cristian; Ghiurea, Marius

doi:10.1080/01932690802498088

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…There was not a liquid crystalline structure observed with the use of a cross polarizer lens. According to Donescu et al [21], the knowledge of the limit of solubilization of a monomer in the micellar aggregates is very important in interpreting the polymerization kinetics.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of butyl acrylate-co-poly (ethylene glycol) dimethacrylate obtained by microemulsion polymerization

Alvarado

Rabelero

Aguilar

et al. 2020

Designed Monomers and Polymers

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The synthesis and characterization of copolymers of n-Butyl Acrylate (BA) and Poly(ethylene glycol) dimethacrylate (PEGDMA) were realized by microemulsion. In this synthesis, the relation of PEGDMA 10, 20, 30, 40 and 50% wt with respect to BA was changed. The copolymers obtained were characterized by the determination of conversions (gravimetry), infrared spectroscopy: Fourier transform (FTIR), dynamic light scattering (DLS), thermogravimetry (TGA) and differential scanning calorimetry (DSC). The results confirmed the synthesis of BA-co -PEGDMA copolymers by the identification of characteristic FTIR bands and which determined the glass transition temperature of the copolymers. The conversions were found in the range of 85% to 90%. Within the stability of the produced latex, it was observed that at 10% and 30% wt. of PEGDMA the systems were stable, but when more PEGDMA was added up 40% to 50% wt., the system became unstable. The stability of produced latexes depends on the PEGDMA contents and this must be less than 30% wt.; meanwhile the PEGDMA content greater than 30% wt. leads to unstable latexes, forming clots. Copolymers showed single glass transition temperatures between −53.37°C and −16.58°C, depending on the composition of PEGDMA in the copolymers. Resulting in the different arrangements of units of PEGDMA along in the chain affected the thermal properties of the final copolymers.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of butyl acrylate-co-poly (ethylene glycol) dimethacrylate obtained by microemulsion polymerization

Alvarado

Rabelero

Aguilar

et al. 2020

Designed Monomers and Polymers

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“…[27][28][29][30][31] In previous papers we have studied also the conditions of obtaining polymer-clay stable latexes, with controlled dimension of the particles and polymer-clay nanocomposites through microemulsion polymerization. 32,33 In specific conditions hybrid nanolatexes are achieved.…”

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Kinetics of Styrene and Butyl Acrylate Polymerization in Anionic Microemulsions in Presence of Layered Silicates

Fialová

Capek

Ianchiş

et al. 2007

Polym J

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The effect was studied of various layered silicates (sodium montmorillonite and different organomodified montmorillonites) on kinetics of styrene (St) and butyl acrylate (BuA) in anionic (sodium dodecyl sulfate) microemulsion polymerization. The dependence of the polymerization rate on the conversion exhibits two rate intervals. The presence of layered silicates affects the conversion and polymerization rate of both St and BuA. The size of polymer particles increases with polarity of Cloisite and the increase is more pronounced in poly(butyl acrylate) particles. The kinetic, colloidal and molecular weight parameters are influence both by the monomer and layered silicate polarities. Different approaches (Ugelstadt, Nomura and Gilbert models) were used for evaluation of polymerization kinetics. The desorption constants (k des ) decrease in presence of the studied layered silicates (Cloisite Na, Cloisite 30B, Cloisite 20A). The decreasing values of the desorption constants in the presence of clays; demonstrate a clear effect, which implies the decreasing of the probability of the radical exit from particles in the presence of the layered silicates.KEY WORDS: Microemulsion Polymerization / Layered Silicates / Kinetics / Nanolatexes / Nanocomposites / The synthesis of nanoclay composites from dispersed systems exhibit an increased interest in the last years. The main reasons include the encapsulation of layered silicates, nanolayer stabilization, in situ polymerization of the monomers in intergalleries of the layered silicates and the possibility of obtaining hybrid particles and nanoparticles.1-5 Even through the numerous reports about emulsion, miniemulsion and suspension polymerization of different monomers in presence of layered silicate can be found in the literature, the kinetics data are rather rare. 1,6,7 Some other papers 8,9 deal with the bulk polymerization of selected monomers, for example methyl methacrylate in presence of montmorillonite (MMT). It was found that an optimal ratio of MMT/initiator (benzoyl peroxide) promotes an increase in the polymerization rate of methyl methacrylate. 8Presence of an organomodified montmorillonite also increases the polymerization rate of styrene in bulk polymerization. 9 In the case of emulsion polymerization of styrene the reaction rate is enhanced by the presence of sodium montmorillonite, however the study handles only one level of inorganic filler. 10In the miniemulsion polymerization of styrene in presence of laponite the silicate layers can be on the surface of the particle but also inside the emulsion-latex particle depending on the initiator nature. 7 In suspension polymerization of styrene in presence of different organophilic montmorillonites silicates are likely also inside the particle.11 For suspension polymerization of methyl methacrylate in presence of organophilic montmorillonite the clay layers are situated both inside and on the surface of the latex particles.12 In this case, the kinetics of the monomer polymerization is much influenced by the presenc...

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“…Keywords: photoinduced miniemulsion polymerization; clays; kinetics; composite nanoparticles Introduction For the past 20 years, there has been increased attention paid to the synthesis of nanocomposites based on either intercalated or exfoliated clay dispersed into various matrix polymers [1][2][3][4][5].…”

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On photoinduced miniemulsion polymerization of butyl acrylate with clay

Capek

2012

Designed Monomers and Polymers

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The miniemulsion polymerizations (MiEPs) of butyl acrylate (BA) initiated by UV-light have been studied. The oil-soluble dibenzoyl peroxide was used as a photoinitiator. Furthermore, the effect of sodium montmorillonite on kinetics and BA miniemulsion stabilized by anionic sodium dodecylsulfate (SDS) and anionic cetyltrimethylammonium bromide (CTAB) was studied. The polymerization rate vs. conversion curve of the photoinduced MiEP of BA was described by two and four nonstationary rate intervals. Two rate intervals with one rate maximum was observed with CTAB and four nonstationary rate intervals with two rate maxima appeared with SDS. Variation of the rate of polymerization with conversion was discussed in terms of types of initiating radicals and the gel effect.Keywords: photoinduced miniemulsion polymerization; clays; kinetics; composite nanoparticles Introduction For the past 20 years, there has been increased attention paid to the synthesis of nanocomposites based on either intercalated or exfoliated clay dispersed into various matrix polymers [1][2][3][4][5].There are also some studies on the formation of composite nanoparticles by the dispersion polymerization of monomers with clays as was reviewed by Capek [6]. As an alternative to the procedures described above, the preparation of nanocomposites using UV-curing technology has only recently been reported as summarized below.There are also several studies. Monomer polarity, monomer functionality, and the functional groups on the organoclay surfaces significantly impact both the degree of clay exfoliation and photopolymerization kinetics. The addition of polymerizable organoclays increases photopolymerization rate in sufficiently exfoliated clay systems, whereas the rate decreases with lower degrees of clay exfoliation. With clay exfoliation, the effective surface area is increased, resulting in immobilization of a greater number of the propagating radicals and decreased termination [7].A photoinitiator intercalated into montmorillonite had high photoinitiation efficiency, even only 1/100 (w/w) modified clay could initiate the radical polymerization with the 87% acrylate conversion on UV-light exposure. The d spacing could be enlarged to 13.9 nm after photopolymerization with organoclay loading. This approach provided a novel pathway for using the highly exfoliated clay-polymer composites for designing intercalating agents capable of introducing different functional groups [8,9].The functionalization of the sodium montmorillonite (MMTNa) surface with glycidylpropyl-triethoxysylane allows to obtain a new modified clay mineral which can be dispersed

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Synthesis and Characterization of Polystyrene, Poly(butyl acrylate)-Layered Silicates Nanocomposites by Polymerization in Anionic Microemulsions

Cited by 5 publications

References 27 publications

Synthesis and characterization of butyl acrylate-co-poly (ethylene glycol) dimethacrylate obtained by microemulsion polymerization

Synthesis and characterization of butyl acrylate-co-poly (ethylene glycol) dimethacrylate obtained by microemulsion polymerization

Kinetics of Styrene and Butyl Acrylate Polymerization in Anionic Microemulsions in Presence of Layered Silicates

On photoinduced miniemulsion polymerization of butyl acrylate with clay

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