Comparison study of the effect of PVP and PANI nanofibers additives on membrane formation mechanism, structure and performance

Zhao, Song; Wang, Zhi; Wei, Xin; Tian, Xinxia; Wang, Jixiao; Yang, Shangbao; Wang, Shichang

doi:10.1016/j.memsci.2011.09.029

Cited by 99 publications

(55 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar observation was found by Gcina et al 26 for the PSf membrane using ligning as an additive and NMP as a solvent. Generaly, water soluble polymers have been considered as pore-formers during membrane formation 45 . It is assumed that most of water soluble polymers can be leached out of the casting film and the sites where the polymer exists become micropores in the prepared membrane 14 .…”

Section: Membrane Morphologymentioning

confidence: 99%

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

et al. 2017

View full text Add to dashboard Cite

Polymer solutions of polysulfone (PSf) and methylcellulose (MC) in 1-methyl-2-pyrrolidone (NMP) were used to prepare ultrafiltration membranes by the phase inversion technique via immersion precipitation. The effect of MC additive on the structure and performances of the membranes was studied. The obtained membranes were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), infrared spectroscopy (FTIR-ATR), equilibrium water content (EWC), water contact angle, porosity and ultrafiltration experiments of polyethylene glycol solutions. It was found that all the PSf/MC membranes had higher porosity, more hydrophilic surface and more vertically finger like pores than PSf membrane. With an increase in MC content in the casting solution from 0.5% to 1.5%, the hydraulic permeability increases from 17.17 to 118.46 L.m -2 .h -1 .bar -1 , while the rejection decreases from 91.82% to 64.45% with PEG 35000. DSC scan and FTIR analysis confirmed that methylcellulose was trapped in the membranes matrix.

show abstract

Section: Membrane Morphologymentioning

confidence: 99%

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The solution was mechanically stirred at 50 °C for at least 8 h to guarantee complete dissolution of the polymer. The casting solution was left still for 24 h to allow the complete release of bubbles (Zhao et al 2011). The membranes were prepared through an immersed phase-inversion process.…”

Section: Membrane Preparationmentioning

confidence: 99%

Preparation and Characterization of Polysulfone/Sulfonated Polysulfone/Cellulose Nanofibers Ternary Blend Membranes

Zhong¹,

Ding²,

Li³

et al. 2015

BioResources

View full text Add to dashboard Cite

Ternary blend membranes were prepared with polysulfone (PSf), sulfonated polysulfone (SPSf), and cellulose nanofibers (CNF) by a LoebSourirajan (L-S) phase inversion process. The cross-section and bottom surface morphology of the membranes were analyzed by scanning electron microscopy (SEM), and the performance of the membranes was evaluated in terms of pure water flux, bovine serum albumin (BSA) rejection, contact angle, tensile strength, and breaking elongation. The morphology of the cellulose nanofibers (CNF) was detected by transmission electron microscopy (TEM). Results showed that within a certain range, the addition of SPSf improved compatibility between PSf and CNF, and the addition of CNF could improve the hydrophilicity of the membranes. The maximum value of pure water flux reached 137.6 L/m 2 h, and the minimum value of BSA rejection reached 95.8% when CNF content was 0.3 wt% in casting solution. Also, a certain addition of CNF could enhance the mechanical properties of the membranes.

show abstract

“…Many researchers have attempted to explain the membrane-forming mechanism from the changes of kinetic and thermodynamic properties of casting solution during the phase inversion process when a suitable additive is introduced into the casting solution [4][5][6][7]. The incorporation of a small amount of hydrophilic polymers such as polyethylene glycol (PEG) or polyvinyl pyrrolidone (PVP) always have the trend to form macrovoids while the macrovoids would be suppressed at high content of additives [8,9]. Pagidi [10] added polymeric additives such as polyvinylpyrrolidone (PVP), polyetherimide (PEI), PEG and polyethersulfone (PES) in order to achieve both higher permeation flux and fouling resistance of polysulfone (Psf) membrane.…”

Section: Introductionmentioning

confidence: 99%

Effects of Additives on the Morphology and Performance of PPTA/PVDF in Situ Blend UF Membrane

Shi

Zhang

et al. 2014

Polymers

View full text Add to dashboard Cite

Poly(p-phenylene terephtalamide) (PPTA), a high-performance polymer with high modulus and good hydrophilicity, is often used as a reinforced material. However, due to its high crystallity, micro-phase separation often occurs in the blends. In this paper, PPTA/poly(vinylidene fluoride) (PVDF) compatible blend solution was synthesized by in situ polycondensation. Blend ultra-filtration membrane was prepared through the immersion phase inversion process. In order to obtain desired pore structure, the effects of different additives including hydrophilic polymer (polyethylene glycol (PEG)), inorganic salt (lithium chloride (LiCl)) and the surfactant (Tween-80) on the morphology and performance of PPTA/PVDF blend membranes were studied. The membrane formation process was investigated through ternary phase diagram (thermodynamics) and viscosities (kinetics) analysis. It was found that, with the increasing of LiCl content, a porous membrane structure with long finger-like pores was formed due to the accelerated demixing process which resulted in the increase of porosity and pore diameter as well as the enhancement of water flux and the decline of PEG rejection. When Tween content increased to over 3 wt%, dynamic viscosity became the main factor resulting in a decreased phase separation rate. The transfer of PEG and LiCl molecules onto membrane surface increased the surface hydrophilicity. The effect of Tween content on membrane hydrophilicity was also correlated with the compatibility of blend components.

show abstract

Comparison study of the effect of PVP and PANI nanofibers additives on membrane formation mechanism, structure and performance

Cited by 99 publications

References 41 publications

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

Preparation and Characterization of Polysulfone/Sulfonated Polysulfone/Cellulose Nanofibers Ternary Blend Membranes

Effects of Additives on the Morphology and Performance of PPTA/PVDF in Situ Blend UF Membrane

Contact Info

Product

Resources

About