Prediction of resin textural properties by vinyl/divinyl copolymerization modeling

Aguiar, Leandro G.; Moura, Juliana O.V.; Theodoro, T. R.; Neto, T.G. Soares; Lopes, Vinícius M.P.; Dias, J. R.

doi:10.1016/j.polymer.2017.09.042

Cited by 8 publications

(15 citation statements)

References 35 publications

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“…BPO has a lower rate of decomposition (free radical formation) than AIBN . Polymeric chains initiated with BPO entrap larger heptane droplets because of their ability to interact with the solvent, leading to reduced porosity …”

Section: Resultsmentioning

confidence: 99%

“…Figure shows a comparison of experimental data from Table (blue bars) with model results (orange bars) for monomer conversion to gel, particle surface area, and swollen volume obtained in runs 1 to 6.…”

Section: Resultsmentioning

confidence: 99%

“…The reactivity ratio of vinyl to divinyl monomers was considered constant for all crosslinkers. Kinetic data and other model parameters were obtained from the elementary gel structure model …”

Section: Methodsmentioning

confidence: 99%

“…A mathematical model based on the elementary gel structure concept has been recently developed to describe the copolymerization of vinyl with divinyl monomers . In addition to estimating common copolymerization variables, the referred model can predict surface area and gel swelling degree . In the current study, model parameters were modified to represent systems with different crosslinkers.…”

Section: Introductionmentioning

confidence: 99%

“…In the current study, model parameters were modified to represent systems with different crosslinkers. Recent literature presents the prediction of the textural properties of STY copolymerized with DVB and EGDMA . Here, the model is applied for the first time to a STY‐TEGDMA copolymer system and the results are compared to those of STY‐DVB and STY‐EGDMA copolymers.…”

Section: Introductionmentioning

confidence: 99%

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Prediction and comparison of textural properties of magnetic copolymer supports for enzyme immobilization

Rosa

Silva

Aguiar

et al. 2020

J of Applied Polymer Sci

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Magnetic polymers supports have proven to be valuable materials for enzyme immobilization, as they allow recovering the catalyst by magnetic separation, precluding the need for costly and time‐consuming separation steps. In this study, magnetic copolymer supports were synthesized using styrene (STY) and different crosslinking agents (divinylbenzene, ethylene glycol dimethacrylate, or triethylene glycol dimethacrylate) and initiators (azobisisobutyronitrile or benzoyl peroxide) and used to immobilize Candida antarctica lipase B (CALB). The aim was to obtain biocatalysts with high enzymatic activity and satisfactory morphological properties for use in biotransformation reactions. Two morphological properties known to influence the immobilization yield were taken into consideration, specific surface area, and swelling index. Experimental data were compared to the predictions of a model based on molar balance, method of moments, numerical fractionation, and elementary gel structures. The high correlation (R2 = 0.9974) between experimental and predicted values demonstrated the suitability of the model for estimating the textural properties of enzyme supports. CALB was successfully immobilized, showing high hydrolytic activity (500–700 U g−1) and good thermal stability at 50°C. CALB/STY‐EGDMA‐M was 14 times more stable than free CALB. The results confirm the efficiency of the immobilization method and the suitability of the copolymers for enzyme immobilization.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction and comparison of textural properties of magnetic copolymer supports for enzyme immobilization

Rosa

Silva

Aguiar

et al. 2020

J of Applied Polymer Sci

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Evaluation of Crosslinked Sulfonated Polymers Derived from Different Resins for Removal of Ammonium Ions

Torquato

Moraes

et al. 2022

Macromolecular Symposia

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Ammoniacal nitrogen is an environmental pollutant present in various effluents, such as landfill leachate. It is possible to use ion‐exchange resins in systems for tertiary treatment of effluents containing NH4+ ions and as support for NH3 recovery after treatment of these effluents by employing air stripping. This article presents an exploratory study of sorption of NH4+ ions by sulfonic resins prepared from styrene‐divinylbenzene (Sty‐DVB) copolymers with varied morphological structures: hypercrosslinked resin, a macroporous copolymer prepared by conventional aqueous suspension polymerization, and a polyHIPE copolymer. These three resins are sulfonated by employing concentrated sulfuric acid. The sulfonic resin derived from hypercrosslinked resin has the highest cation exchange capacity (5.06 meq g−1) and is selected for batch studies and column tests. The best result (removal rate of 87%) is achieved with 20 g of resin, time of 20 min, and concentration of 100 ppm. Kinetic behavior and sorption processes are best described by the pseudo‐second‐order, Weber–Morris intraparticle diffusion, and Langmuir models. The saturation point occurs when 900 mL of the NH4+ solution at 2500 ppm (15 mL min−1) is percolated through the column. The working capacity of this resin is 14.06 g cm−3. The resin can be reused during five cycles with removal efficiency between 71% and 82%.

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Use of Ion-Exchange Resins in Alkylation Reactions

Lachter

Rodrigues

Mendonça

et al. 2019

Applications of Ion Exchange Materials in Chemical and Food Industries

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Prediction of resin textural properties by vinyl/divinyl copolymerization modeling

Cited by 8 publications

References 35 publications

Prediction and comparison of textural properties of magnetic copolymer supports for enzyme immobilization

Prediction and comparison of textural properties of magnetic copolymer supports for enzyme immobilization

Evaluation of Crosslinked Sulfonated Polymers Derived from Different Resins for Removal of Ammonium Ions

Use of Ion-Exchange Resins in Alkylation Reactions

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