Influência das condições reacionais nas características de copolímeros de metacrilato de metila e divinilbenzeno obtidos por polimerização em suspensão

Cardoso, Anelise M.; Lucas, Elizabete F.; Barbosa, Celina C. R.

doi:10.1590/s0104-14282004000300017

Cited by 11 publications

(10 citation statements)

References 8 publications

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“…Therefore, any difference in the density “ d ” of the packed spherical beads of porous methyl methacrylate–divinylbenzene should be related to pore volume “ V m ” of the beads. This deduction is supported by the plot of the densities verses pore volumes from this study and from literature22 as illustrated in Figure 6. The best fit equation to the data is the following second degree polynomial: where “ V e ” is the estimated pore volume.…”

Section: Resultssupporting

confidence: 78%

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Synthesis and simple method of estimating macroporosity of methyl methacrylate–divinylbenzene copolymer beads

Malik

Ali

2008

J of Applied Polymer Sci

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Macroporous methyl methacrylate-divinylbenzene copolymer beads having diameter $ 300 lm were synthesized by free radical suspension copolymerization. The macroporosity was generated by diluting the monomers with inert organic liquid diluents. The macroporosity was varied in the range of $ 0.1 to $ 1.0 mL/g by varying a number of porosity controlling factors, such as the diluents, solvent to nonsolvent mixing ratios when employing a mixture of the two diluents, degree of dilution, and crosslinkage. Increase in pore volume from 0.1 to 0.45 mL/g resulted in a sharp increase in mesopores having diameters in the range of 3-20 nm whereas the macropores remained negligible when compared with mesopores. Increase in pore volume from 0.45 to 1 mL/g resulted in a sharp increase in macropores, whereas mesopores having diameters in the range of 3-20 nm remained almost constant. The mesopores having diameters in the range of 20-50 nm showed an increase with the increase in pore volume throughout the whole range of pore volume studied. Macroporosity characteristics, i.e., pore volume (V m ), surface area (SA), and pore size distributions were evaluated by mercury penetration method. Statistical analysis of the data obtained in the present study shows that the macroporosity characteristics can be estimated with a reasonable accuracy from the pore volumes, which in turn are determined from the densities of the copolymers. These results are explained on the basis of pore formation mechanism.

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Section: Resultssupporting

confidence: 78%

“… Plot of densities versus pore volumes: Crosses are the experimental values from this study, thick line is the best‐fit equation eq. (7) based on the crosses and triangles are the experimental values obtained from Ref 22…”

Section: Resultsmentioning

confidence: 99%

Synthesis and simple method of estimating macroporosity of methyl methacrylate–divinylbenzene copolymer beads

Malik

Ali

2008

J of Applied Polymer Sci

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“…This technique provided an indication of polymer porosity as a function of different degrees of opacity, such as: transparency, diaphanous and opaque [22] . According to the literature, opaque beads have a structural heterogeneity, which not allows the passage of light through the polymer structure, unlike transparent beads [22,23] . This fact is associated to greater refraction of the light passing through the beads.…”

Section: Resultsmentioning

confidence: 99%

“…This fact is associated to greater refraction of the light passing through the beads. All the polymers reported in this manuscript presented opaque beads with spherical morphology [22,23] . The solubility parameter (δ) influences the porous nature of polymer.…”

Section: Resultsmentioning

confidence: 99%

Sorption of 2-chlorophenol from aqueous solutions by functionalized cross-linked polymers

Fráguas¹,

Aguiar²,

Jandrey³

2013

Polímeros

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This manuscript describes the synthesis of three polymers based on styrene (STY), divinylbenzene (DVB) and two different vinyl monomers: methyl methacrylate (MMA) and acrylonitrile (AN). The STY-DVB, STY-DVB-MMA and STY-DVB-AN polymers were synthesized employing the aqueous suspension technique. Reaction yields were 73%, 81% and 75%, respectively. They were morphological and chemically characterized using different techniques. The extraction capacity of the polymers was evaluated using 2-chlorophenol. The polymer extraction capacities were evaluated varying contact time the (1 h, 3 h and 5 h), temperature (30 °C, 35 °C and 40 °C), and pH (3, 5.6 and 8). The STY-DVB-AN polymer was the most efficient; it removed around 95% of the analyte using a contact time 50 h.

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“…Therefore, when the solubility parameters of polymer and solvent are near each other, the two substances will mix spontaneously. When the modulus of this difference is greater than 1.5, the polymer and solvent phases separate, causing the formation of pores. Combining diluents in different proportions allows obtaining a diversified porous structure, adequate to the desired usage.…”

Section: Introductionmentioning

confidence: 99%

Polymer microspheres: Influence of composition and porosity on filtrate reduction from aqueous fluids

Rodrigues

Nunes

Ribeiro

et al. 2016

J of Applied Polymer Sci

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During the drilling and completion of oil wells, the drilling fluid flowing down the annulus can invade the rock formation, possibly causing irreversible damage to the reservoir. One of the main functions of these fluids is to form a film with low permeability on the borehole wall to prevent invasion of filtrate in the rock formation. Polymeric additives are increasingly used to control these infiltrations. Recent studies have shown the potential of using microspheres made of poly(methyl methacrylate-co-vinyl acetate) (PMMA-co-PVAc) with dimensions compatible with the size of the formation pores. In this study, PMMA and PMMAco-PVAc polymers were synthesized by suspension polymerization, producing in the presence or absence of porogenic agents. The particles porosities influence the glass transition temperature, surface roughness and apparent density. The results also demonstrate that less rigid spheres with pores in their structure form a more efficient barrier against filtration to the rock formation. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44484.

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Influência das condições reacionais nas características de copolímeros de metacrilato de metila e divinilbenzeno obtidos por polimerização em suspensão

Cited by 11 publications

References 8 publications

Synthesis and simple method of estimating macroporosity of methyl methacrylate–divinylbenzene copolymer beads

Synthesis and simple method of estimating macroporosity of methyl methacrylate–divinylbenzene copolymer beads

Sorption of 2-chlorophenol from aqueous solutions by functionalized cross-linked polymers

Polymer microspheres: Influence of composition and porosity on filtrate reduction from aqueous fluids

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