Modification of ultrafiltration membranes via interpenetrating polymer networks for removal of boron from aqueous solution

Palencia, Manuel; Vera, Myleidi; Rivas, Bernabé L.

doi:10.1016/j.memsci.2014.05.003

Cited by 38 publications

(21 citation statements)

References 27 publications

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“…In semi‐IPNs, the hydroxyl‐terminated PDMS changed from flexible linear structure to the three‐dimensional network structure, as a result the concentration of the crosslinks increased. With the increase of PDMS content, the concentration of the crosslinks increases, so the flowability of the casting solution decreases, and the viscosity of the casting solution increases accordingly . From Figure , the viscosity of PDMS/PVDF casting solutions with semi‐IPNs structure was much bigger than that of the casting solution without the semi‐IPNs structure (shown in section 3.1 in literature).…”

Section: Resultsmentioning

confidence: 85%

PDMS/PVDF microporous membrane with semi‐interpenetrating polymer networks for vacuum membrane distillation

Duan²,

et al. 2017

J of Applied Polymer Sci

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In this article, using the non‐solvent induced phase separation process, a new microporous membrane with the semi‐interpenetrating polymer network (semi‐IPN) structure was produced. For this membrane, polydimethylsiloxane (PDMS) polymer is crosslinking and poly(vinylidene fluoride) (PVDF) polymer is linear, by changing the mass ratio of PDMS/PVDF, the structure and the performance of the prepared membranes were studied. The membranes were also investigated by attenuated total reflection‐Fourier transform infrared (ATR‐FTIR), scanning electron microscopy–energy‐dispersive X‐ray spectroscopy, X‐ray diffraction, thermogravimetric analysis, and water contact angle, etc. ATR‐FTIR spectroscopy confirmed the formation of semi‐IPN; compared with the PDMS/PVDF polymer without semi‐IPNs structure, the viscosity of the semi‐IPNs structured casting solution increased, membrane mechanical property increased but its hydrophobicity decreased. Using the resulting membranes for the vacuum membrane distillation desalt of the NaCl solution (30 g/L), 99.9% salt rejection and reasonable flux were obtained. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45792.

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Section: Resultsmentioning

confidence: 85%

PDMS/PVDF microporous membrane with semi‐interpenetrating polymer networks for vacuum membrane distillation

Duan²,

et al. 2017

J of Applied Polymer Sci

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“…In semi‐IPNs, because of the existence of crosslinking agent, the linear pre‐crosslinking polymers can participate in the reactions of polymerization or crosslinking, which make it possible to create semi‐IPNs structure. With the increase in crosslinking agent, the concentration of cross‐links increases , so the liquidity of casting solution decreases, and the viscosity of the casting solution increases accordingly .…”

Section: Resultsmentioning

confidence: 99%

“…With the increase in TEOS content, the proportions of the sponge‐like pores increased. In addition, the semi‐IPN structure worked as a bridging point and improved the actuation strains of the membranes and also increased the elongation at break .…”

Section: Resultsmentioning

confidence: 99%

Structuring and characterization of a novel microporous PVDF membrane with semi‐interpenetrating polymer networks for vacuum membrane distillation

Sun

Zheng

Liu

et al. 2017

Polymer Engineering & Sci

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In this paper, by using the non-solvent induced phase separation (NIPS) process, a new microporous membrane with semi-interpenetrating polymer network (semi-IPN) was produced in which PDMS polymer is crosslinked and PVDF polymer is linear. For the fabrication of the membrane, tetraethylorthosilicate (TEOS) was used as the crosslinking agent and dibutyltin dilaurate (DBTDL) was used as the catalyst. By changing the mass ratio of PDMS/TEOS, the structure and the performance of the prepared membrane were studied. The membranes were also investigated by scanning electron microscopy (SEM-EDX), X-ray diffraction (XRD), attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, capillary flow porometer, thermogravimetric analysis (TGA), water contact angle (WCA), etc. Through the experiments we found that the semi-IPNs structure was more likely produce the sponge-like pores and was more favorable to the mechanical properties, pore structure and thermal stability of the membranes. Using the PDMS-PVDF membranes for the VMD desalt of the NaCl solution (30 g/L), 99.9% salt rejection and reasonable fluxes were obtained, which make us believe that it could be possible to use the semi-IPNs PDMS-PVDF membrane to treat real sea water for its desalt.

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“…Sin embargo, las membranas basadas en estos últimos han adquirido especial interés comercial, a causa de su gran versatilidad molecular, facilidad de síntesis, modificación y moldeado [2]. Recientemente, dada la necesidad de desarrollar procesos de separación más selectivos, eficientes y duraderos, diversas investigaciones se han centrado en la modificación de membranas poliméricas con grupos específicos, con el objetivo de obtener de esta forma novedosos materiales funcionales, donde la membrana no solamente actúa como una barrera que permite únicamente el paso de compuestos de un tamaño definido, sino que, también tiene la capacidad de interaccionar de forma no covalente con estos, pasando de esta forma de un componente pasivo en la separación a un componente activo [3][4]. No obstante, este no es el único objetivo, también se han modificado membranas para el control del fouling o ensuciamiento, en especial para aquellas membranas empleadas en aplicaciones médicas y para el tratamiento de aguas residuales, donde la prevención del biofouling adquiere particular interés, ya que las incrustaciones de microorganismos en las membranas generan la liberación de sustancias poliméricas extracelulares, las cuales pueden generar bloqueos del poro, y por ende la disminución del flujo, incremento del consumo energético y una marcada disminución del tiempo de vida útil de las membranas [5][6].…”

Section: Introductionunclassified

Generation of thiolated porous surfaces by interpenetrating polymeric networks: study of their surface properties.

Lerma¹,

s.a.s²,

Martínez³

et al. 2017

J. Sci. Technol. Appl.

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Generación de superficies porosas tioladas mediante redes poliméricas interpenetrantes: estudio de sus propiedades superficiales ResumenPalabras claves La generación de redes poliméricas interpenetrantes (RPIs) es un método de síntesis de polímeros, que surge como una estrategia eficiente para la modificación de membranas, a partir de la generación de estructuras poliméricas entrecruzadas o interpenetradas total o parcialmente, sin poseer uniones de tipo covalente entre sí. Permitiendo entonces, con una adecuada planificación, el desarrollo de membranas que combinen tanto las propiedades del polímero de soporte y como del agente modificante, y por consiguiente la obtención de materiales con propiedades definidas. Por lo anterior, la modificación superficial de membranas mediante RPIs, permite el desarrollo de superficies con grupos tioles como potenciales puntos de estabilización de nanoparticulas metálicas. Así, el objetivo de este trabajo fue desarrollar superficies porosas tioladas vía RPIs y el estudio de sus propiedades superficiales. Para esto, RPIs se desarrollaron usando 4-clorometil estireno en el interior de discos de polipropileno y fibra de vidrio. Después, se incorporaron grupos tioles sobre Sustitución nucleofílicaÁngulo de contacto Polimerización radicalaria Cisteamina Cisteína

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Modification of ultrafiltration membranes via interpenetrating polymer networks for removal of boron from aqueous solution

Cited by 38 publications

References 27 publications

PDMS/PVDF microporous membrane with semi‐interpenetrating polymer networks for vacuum membrane distillation

PDMS/PVDF microporous membrane with semi‐interpenetrating polymer networks for vacuum membrane distillation

Structuring and characterization of a novel microporous PVDF membrane with semi‐interpenetrating polymer networks for vacuum membrane distillation

Generation of thiolated porous surfaces by interpenetrating polymeric networks: study of their surface properties.

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