The Influence of Peg Molecular Weight on Morphologies and Properties of PVDF Asymmetric Membranes

Zuo, Dunwen; Xu, Yuan; Xu, Weilin; Zou, Hantao

doi:10.1142/s0256767908003072

Cited by 80 publications

(36 citation statements)

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“…The differences were the intensity of the peak in the same wavenumbers. This is proven that there is no interaction between PEG and PVDF/CA membrane because PEG and DMAc moved out of the membrane matrix and formed pores, which this happened in phase inversion process [12].…”

Section: Figure 1 the Cross-linked Layer Morphology Characterised Bmentioning

confidence: 96%

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Preparation of polyvinylidene fluoride/cellulose acetate blend membrane with polyethylene glycol additive for apple juice clarification

Fitri¹,

Widiastuti²

2017

AIP Conference Proceedings

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Abstract. Polyvinylidene Fluoride (PVDF)/Cellulose Acetate (CA) blend membrane with polyethylene (PEG) addition of casting solution were synthesised to determine its morphology. This purpose of this research is to investigate the effect of PEG addition to membrane performance and its application to the clarification of apple juice. The membranes were prepared from polymer blends of CA and PVDF, dimethyl acetamide (DMAc) as solvent, and PEG as additive. Phase inversion was used to prepare membranes by mixing the polymer blends, solvent and additive to be reacted at temperature 60 °C for 24 hours. The variation of PEG weight percentage were 0, 1 wt%, 3 wt%, and 5 wt%. The addition of PEG increased porosity and fluxes, but decreased membrane rejection. Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM), and Fourier Transform Infrared (FTIR) were applied to evaluate the morphology of membranes, which investigated increasing of pore size, pore distribution, and surface roughness. Apple juice clarification by membrane with 1% PEG was obtained 95,1% clearer than the pure sample.

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Section: Figure 1 the Cross-linked Layer Morphology Characterised Bmentioning

confidence: 96%

“…It showed that PEG influenced pore size. Zuo et al (2008) found that PVDF membrane obtained bigger pore size along with the addition of PEG. However, the effect of PEG addition to PVDF/CA membrane has never been investigated before.…”

Section: Introductionmentioning

confidence: 95%

Preparation of polyvinylidene fluoride/cellulose acetate blend membrane with polyethylene glycol additive for apple juice clarification

Fitri¹,

Widiastuti²

2017

AIP Conference Proceedings

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“…Fluctuations of PLLA-PEG6000/AC are only slightly lower than that of PLLA-PEG10000/AC. Zuo et al (2008) found that in PEG-PVDF membrane system, as PEG molecular weight increased from 200 to 20000, the macrovoids were developed initially and then were suppressed at transition point of PEG molecular weight of 6000. However, this trend was not observed in our PLLA-PEG/AC membrane system.…”

Section: Performance Test Effect Of Peg Molecular Weight On Permeatiomentioning

confidence: 99%

“…During the phase inversion process, PEG hydrophilic blocks were uniformly dispersed throughout the membrane, where it facilitates the diffusion of water molecules to the casted film in the coagulation bath, which consequently becomes a point for pore formation. When PEG molecular weight was increased from 4000 to 10000, the pore size and pore number on membrane upper surface was increased (Zuo et al 2008). More pores on membrane surface and the better interconnectivity inside membrane would contribute to enhancing pure water flux and reducing solute rejection (Kim & Lee 1998).…”

Section: Performance Test Effect Of Peg Molecular Weight On Permeatiomentioning

confidence: 99%

“…However, a further increment in the molecular weight of PEG resulted in reduction of pure water flux (PWF) and increasing solute rejection. Combined with the precipitation rates of different membrane-forming systems, the membrane formation mechanism describing PEG mobility was discussed extensively based on the length changes of PEG molecular chains and the affinity between PEG and casting solution (Zuo et al 2008). Thus, for a better understanding of the role played by these components, the preparation of membrane comprised of PLLA-PEG copolymer with activated carbon filler and membrane performance based on the change of the length of PEG molecular chains will be discussed in this report.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Molecular Weight on the Surface and Permeation of Poly(L-lactic acid)-Poly(ethylene glycol) Membrane with Activated Carbon Filler

Sidik

Othaman²,

Anuar³

2018

JSM

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Effects of Polyvinylpyrrolidone on Structure and Performance of Composite Scaffold of Chitosan Superfine Powder and Polyurethane

Zuo¹,

Yan-Wang²,

Xu³

et al. 2011

Adv Polym Technol

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Novel asymmetric composite scaffolds of chitosan superfine powder (CSP) and biomedical polyurethane (BPU) were prepared by an immersion-precipitation phase inversion method. Effects of polyvinylpyrrolidone (PVP) as a pore-forming agent on the structure and performance of the CSP/BPU composite scaffolds were investigated. The morphology and structure of the composite scaffolds were verified via scanning electron microscopy, X-ray diffraction, and porosity measurement. The performance of composite scaffolds was characterized by determination of the swelling ratio, measurement of the water vapor transmission rate (WVTR), mechanical test, and degradation experiment. The result showed that all CSP/BPU scaffolds were asymmetric with a skin layer near the top surface and a porous supporting solid matrix. The porosity and average pore size of CSP/BPU scaffolds exhibited a maximum value at 5 wt% PVP. The crystallinity and the lamellar thickness (L) of composite

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The Influence of Peg Molecular Weight on Morphologies and Properties of PVDF Asymmetric Membranes

Cited by 80 publications

References 0 publications

Preparation of polyvinylidene fluoride/cellulose acetate blend membrane with polyethylene glycol additive for apple juice clarification

Preparation of polyvinylidene fluoride/cellulose acetate blend membrane with polyethylene glycol additive for apple juice clarification

The Effect of Molecular Weight on the Surface and Permeation of Poly(L-lactic acid)-Poly(ethylene glycol) Membrane with Activated Carbon Filler

Effects of Polyvinylpyrrolidone on Structure and Performance of Composite Scaffold of Chitosan Superfine Powder and Polyurethane

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