Hydrophilic modification of PTFE microfiltration flat membrane by crosslinking OCMCS-PEI to enhance anti-fouling property

Wang, Jieqi; Li, Chengcai; Wang, Feng; Yu, Bin; Luo, Yang; Zeng, H.; Zhu, Hailin

doi:10.1016/j.porgcoat.2019.06.035

Cited by 25 publications

(2 citation statements)

References 28 publications

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“…In recent years, the cross-linked co-deposition method has received much attention in the modification of PTFE microfiltration membranes due to its simplicity, low cost, and ease of industrialization. This method usually involves depositing and wrapping a hydrophilic layer onto the fibers and nodes of the PTFE microfiltration membrane by crosslinking one or more hydrophilic substances [12][13][14]. Polyvinyl alcohol is an environmentally friendly material with abundant hydroxyl groups in its molecular chain and good hydrophilic and biocompatible properties.…”

Section: Introductionmentioning

confidence: 99%

Cross-Linking Combined with Surfactant Bilayer Assembly Enhances the Hydrophilic and Antifouling Properties of PTFE Microfiltration Membranes

Cao

et al. 2021

Separations

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The inherent strong hydrophobicity of Polytetrafluoroetylene (PTFE) microfiltration membranes results in low separation efficiency and easy contamination. In order to enhance its hydrophilic and antifouling properties, we first modified the PTFE microfiltration membrane by using Polyethylene glycol laurate (PEGML) for first layer deposition and then used Polyvinyl alcohol (PVA)/citric acid (CA) cross-linked coatings for second layer deposition. The Scanning Electron Microscope (SEM) results showed that the fibers and nodes of the modified PTFE microfiltration membrane were coated with PVA/CA hydrophilic coating. FT-IR Spectromete and X-ray photoelectron spectrometer (XPS) analysis results confirmed that crosslinking of PVA and CA occurred and that PEGML and PVA/CA were successfully deposited onto the membrane surface. The modification conditions were optimized by hydrophilicity testing, and the best hydrophilicity of the modified membrane was achieved when the crosslinking content of PEGML was 2 g·L−1, PVA was 5 g·L−1, and CA was 2 g·L−1. PTFE microfiltration membranes modified by the optimal conditions achieved a water flux of 396.9 L·m−2·h−1 (three times that of the original membrane) at low operating pressures (0.05 MPa), and the contact angle decreased from 120° to 40°. Meanwhile, the modified PTFE microfiltration membrane has improved contamination resistance and good stability of the hydrophilic coating.

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Section: Introductionmentioning

confidence: 99%

Cross-Linking Combined with Surfactant Bilayer Assembly Enhances the Hydrophilic and Antifouling Properties of PTFE Microfiltration Membranes

Cao

et al. 2021

Separations

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“…Due to low PTFE surface energy, its surface properties such as hydrophilicity, adhesivity and printability tend not to meet the requirements for industrial applications (Sun et al 2018). In order to tackle these drawbacks, various enhancements have been made to modify its surface properties such as crosslinking (Wang et al 2019), laser ablation (Qin et al 2019) and (Yin et al 2018), atomic layer deposition (Krumpolec et al 2016), co-deposition (Li et al 2019) and (Song et al 2017), plasma treatment (Cheng et al 2019) and radiation induced grafting polymerization (López et al 2019;Park et al 2016a).…”

Section: Introductionmentioning

confidence: 99%

Modification of PTFE Flat Sheet Film via Radiation Induced Grafting Polymerization with Acrylic Acid

Ghani¹,

Hamzah²,

Mohamed³

2020

JSM

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Polytetrafluoroethylene (PTFE) flat sheet film was modified with acrylic acid (AAC) by radiation induced grafting polymerization (RIGP) method using electron beam. The adsorbed doses were varied from 10 to 50 kGy, time of grafting from 1 to 3 h and monomer concentration and temperature were kept constant at 30 wt. % and 40ºC. The degree of grafting (D g) and equilibrium degree of swelling (EDS) of the grafted films were then determined. The films were further characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), atomic force microscope (AFM), X-ray diffraction (XRD), and optical water contact angle. D g within the range of 17% to 210% were obtained for doses from 10 to 50 kGy within time of grafting from 1 to 3 h. The grafted film (PTFE-g-AAC) showed increased hydrophilicity leading to an increase in EDS. The successful grafting process was confirmed by FTIR results that showed characteristics peaks for carbonyl and hydroxyl group and a decrease in crystallinity for the PTFE-g-AACfilm. SEM images showed that PTFE-g-AAC films had less fibrillar compared to PTFE film and was consistent with the decrease in roughness for the PTFE-g-AAC film. This study indicated that modifying PTFE film by grafting AAC could significantly improve the hydrophilicity of PTFE film. The PTFE-g-AAC films has potential as a heavy metal adsorbent as it can remove at least 75% of Fe ion and 50 % of Pb ion from competitive media.

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Preparation and Characterization of a New Negatively Charged PTFE Fiber Membrane for Separating Oil-in-water Emulsions Containing Cationic Emulsifiers

Tang

Zheng

et al. 2021

Fibers Polym

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Hydrophilic modification of PTFE microfiltration flat membrane by crosslinking OCMCS-PEI to enhance anti-fouling property

Cited by 25 publications

References 28 publications

Cross-Linking Combined with Surfactant Bilayer Assembly Enhances the Hydrophilic and Antifouling Properties of PTFE Microfiltration Membranes

Cross-Linking Combined with Surfactant Bilayer Assembly Enhances the Hydrophilic and Antifouling Properties of PTFE Microfiltration Membranes

Modification of PTFE Flat Sheet Film via Radiation Induced Grafting Polymerization with Acrylic Acid

Preparation and Characterization of a New Negatively Charged PTFE Fiber Membrane for Separating Oil-in-water Emulsions Containing Cationic Emulsifiers

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