Synthesis and characterization of nanoporous polycaprolactone membranes via thermally- and nonsolvent-induced phase separations for biomedical device application

Yen, Chun-Wan; He, Hongyan; Lee, L. James; Ho, W.S. Winston

doi:10.1016/j.memsci.2009.07.024

Cited by 42 publications

(17 citation statements)

References 41 publications

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“…On both composites, the pores appear as single isolated openings. A similar observation and inference were reported by Yen et al [11] on the synthesis of PCL membranes via thermal treatment and nano-solvent-induced separation.…”

Section: X-ray Fluorescence (Xrf)supporting

confidence: 88%

Adsorption Behaviour of Ethylene Vinyl Acetate and Polycaprolactone-Bentonite Composites for Pb2+ Uptake

Dlamini¹,

Mishra²,

Mamba³

2011

J Inorg Organomet Polym

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The results presented in this work show that the hydrophobic thermoplastics, namely ethylene vinyl acetate (EVA) and polycaprolactone (PCL), could be good matrices for the synthesis of polymer/bentonite composites via the melt-blending method for the removal of heavy metals from water. The hydrophobic nature of the polymers was countered by using dry Na 2 SO 4 to form large free-volume pores. These pores, formed after the removal of the Na 2 SO 4 by washing, improved the contact ratio between bentonite particles and Pb 2? ions. The composites were able to achieve up to 78% Pb 2? removal at an initial concentration of 200 mg/L in 10 h with a clay loading of 3% (w/w). The results confirmed that the PCL/bentonite composite was more effective and efficient in the adsorption of Pb 2? than the EVA/bentonite composite. The experimental data for both composites followed Langmuir and Freundlich models. The uptake of Pb 2? was found to be a result of a chemical interaction between the heavy metal, silanol (Si-OH) and aluminol (Al-OH) groups. The adsorption of Pb 2? onto the composites was found to follow pseudo-first-order kinetics and the results supported a monomolecular reaction mechanism.

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Section: X-ray Fluorescence (Xrf)supporting

confidence: 88%

Adsorption Behaviour of Ethylene Vinyl Acetate and Polycaprolactone-Bentonite Composites for Pb2+ Uptake

Dlamini¹,

Mishra²,

Mamba³

2011

J Inorg Organomet Polym

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“…Coagulant temperature affects the kinetics of phase inversion significantly [40]. Generally, a higher coagulation bath temperature results in a more porous membrane since the solvent and non-solvent exchange rate is higher.…”

Section: Effect Of Water Coagulation Bath Temperaturementioning

confidence: 99%

Synthesis and characterization of nanoporous polyethersulfone membrane as support for composite membrane in CO2 separation: From lab to pilot scale

Zhao

Vakharia

et al. 2016

Journal of Membrane Science

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Nanoporous polyethersulfone (PES) membranes were prepared from PES/N-methyl-2pyrrolidone (NMP)/2-methoxyethanol (2-ME) casting solutions with water as coagulant by both vapor-and non-solvent-induced phase inversion steps successively under various preparation parameters. 2-ME was incorporated into the casting solution as a pore-forming additive because of its high affinity with water, leading to more open membrane morphology. A detailed study of the effects of different parameters, including polymer concentration, 2-ME/NMP ratio, relative humidity, water vapor exposure time, and water coagulation bath temperature, was conducted in lab-scale experiments to determine the operation guidelines for pilot-scale fabrication. 14-inch wide PES membranes were fabricated successfully by using a continuous casting machine. Parametric studies in pilot-scale fabrication were also carried out. Surface morphologies of PES membranes were characterized by scanning electron microscopy (SEM). The morphological differences between both scales by the same preparation conditions were compared. Based on the guidelines established from lab-scale experiments, the casting solution composition and coagulation bath temperature were optimized in a pilot-scale continuous casting machine to fabricate the 14-inch wide PES membrane with a desired morphology suitable for use as the substrate of composite membranes in CO 2 separation. The studied fabrication process also showed the potential for the commercial production of the PES membrane in a larger scale by the vapor-and non-solvent-induced phase inversion technique.

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“…The final morphology of the membranes obtained will vary greatly, depending on the properties of the materials and the process conditions. Phase inversion technique has been one of the most important controlling procedures to obtain porous structures, including different approaches: (1) thermally induced phase separation: precipitation by cooling, (2) vapor induced phase separation: precipitation by absorption of non‐solvent (water) from the vapor phase, (3) non‐solvent induced phase separation: immersion precipitation in a non‐solvent (typically water), and (4) evaporation induced phase separation: dry casting‐solvent evaporation . The phase inversion mechanism plays a crucial role in the membranes morphology.…”

Section: Introductionmentioning

confidence: 99%

Morphological control of porous membranes based on aromatic polyether/water soluble polymers

Karamessini

Lainioti

Deimede

et al. 2016

J of Applied Polymer Sci

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This work describes the development of porous membranes based on blends of an aromatic polyether bearing main and side chain pyridine units (AP) with hydrophilic ionic polymers, like poly(sodium 4-styrenesulfonate) (PSSNa) and its acid form (PSSH), or non-ionic like polyvinylpyrrolidone and polyethylene glycol. Porous membranes were obtained after the removal of the water soluble polymers from the respective blend. The effect of various parameters such as water soluble polymer used (pore former), blend composition, casting solvent, and solvent evaporation level on porous structure formation was studied thoroughly. Specifically, SEM examination for the aforementioned systems indicated various porous morphologies depending on experimental conditions as well as thermodynamic and kinetic parameters occurring during their formation. The thermal properties of the membranes were influenced by the kind of the pore former, as revealed by thermogravimetric analysis. Special attention was paid to the systems AP/ PSSNa and AP/PSSH to evaluate their miscibility via dynamic mechanical analysis and ATR-FTIR spectroscopy. AP/PSSNa membranes have been preliminary used to test the water permeability for water purification. The tests revealed high water flux values at increased PSSNa concentrations.

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Synthesis and characterization of nanoporous polycaprolactone membranes via thermally- and nonsolvent-induced phase separations for biomedical device application

Cited by 42 publications

References 41 publications

Adsorption Behaviour of Ethylene Vinyl Acetate and Polycaprolactone-Bentonite Composites for Pb2+ Uptake

Adsorption Behaviour of Ethylene Vinyl Acetate and Polycaprolactone-Bentonite Composites for Pb2+ Uptake

Synthesis and characterization of nanoporous polyethersulfone membrane as support for composite membrane in CO2 separation: From lab to pilot scale

Morphological control of porous membranes based on aromatic polyether/water soluble polymers

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