scholarly journals Constructing Functional Ionic Membrane Surface by Electrochemically Mediated Atom Transfer Radical Polymerization

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Fen Ran ◽  
Dan Li ◽  
Jiayu Wu
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Electric Potential ◽  
Active Sites ◽  
Blood Compatibility ◽  
Membrane Surface ◽  
Monomer Concentration ◽  
Sodium Acrylate ◽  
Atom Transfer ◽  
Polymerization Time

The sodium polyacrylate (PAANa) contained polyethersulfone membrane that was fabricated by preparation of PES-NH2via nonsolvent phase separation method, the introduction of bromine groups as active sites by graftingα-Bromoisobutyryl bromide, and surface-initiated electrochemically atom transfer radical polymerization (SI-eATRP) of sodium acrylate (AANa) on the surface of PES membrane. The polymerization could be controlled by reaction condition, such as monomer concentration, electric potential, polymerization time, and modifier concentration. The membrane surface was uniform when the monomer concentration was 0.9 mol/L, the electric potential was −0.12 V, the polymerization time was 8 h, and the modifier concentration was 2 wt.%. The membrane showed excellent hydrophilicity and blood compatibility. The water contact angle decreased from 84° to 68° and activated partial thromboplastin increased from 51 s to 84 s after modification of the membranes.

scholarly journals Membrane Biofouling Control by Surface Modification of Quaternary Ammonium Compound Using Atom-Transfer Radical-Polymerization Method with Silica Nanoparticle as Interlayer

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 417
Author(s):  
Lehui Ren ◽  
Meng Ping ◽  
Xingran Zhang
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Quaternary Ammonium ◽  
Polyvinylidene Fluoride ◽  
High Performance ◽  
Membrane Surface ◽  
Silica Nanoparticle ◽  
Ammonium Compound ◽  
Atom Transfer ◽  
Nanoparticle Layer

A facile approach to fabricate antibiofouling membrane was developed by grafting quaternary ammonium compounds (QACs) onto polyvinylidene fluoride (PVDF) membrane via surface-initiated activators regenerated by electron transfer atom-transfer radical-polymerization (ARGET ATRP) method. During the modification process, a hydrophilic silica nanoparticle layer was also immobilized onto the membrane surface as an interlayer through silicification reaction for QAC grafting, which imparted the membrane with favorable surface properties (e.g., hydrophilic and negatively charged surface). The QAC-modified membrane (MQ) showed significantly improved hydrophilicity and permeability mainly due to the introduction of silica nanoparticles and exposure of hydrophilic quaternary ammonium groups instead of long alkyl chains. Furthermore, the coverage of QAC onto membrane surface enabled MQ membrane to have clear antibacterial effect, with an inhibition rate ~99.9% of Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive), respectively. According to the batch filtration test, MQ had better antibiofouling performance compared to the control membrane, which was ascribed to enhanced hydrophilicity and antibacterial activity. Furthermore, the MQ membrane also exhibited impressive stability of QAC upon suffering repeated fouling–cleaning tests. The modification protocols provide a new robust way to fabricate high-performance antibiofouling QAC-based membranes for wastewater treatment.

Hydrophilic Modification of PES Hollow Fiber Membrane via Surface-Initiated Atom Transfer Radical Polymerization

2010 ◽  
Vol 150-151 ◽  
pp. 565-570 ◽  
Author(s):  
Yong Bo Shen ◽  
Ya Tao Zhang ◽  
Jian Hua Qiu ◽  
Yan Wu Zhang ◽  
Hao Qin Zhang
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Hollow Fiber ◽  
Polymer Brushes ◽  
Hollow Fiber Membrane ◽  
Membrane Surface ◽  
Pure Water ◽  
Average Molecular Weight ◽  
Atom Transfer ◽  
Fiber Membrane

Hydrophilic poly((poly(ethylene glycol) methyl ether methacrylate) (P(PEGMA)) brushes were grafted from chloromethylated polyethersulfone (CMPES) hollow fiber membrane surface by surface-initiated atom transfer radical polymerization(SI-ATRP) to improve the membrane’s hydrophilic property. The CMPES hollow fiber membrane was prepared by phase inversion process. The benzyl chloride groups on the CMPES membrane surface could afford effective macroinitiators for grafting the well-defined polymer brushes. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy confirmed the grafting of P (PEGMA) chains. Field emission scanning electron microscopy (FESEM) was used to characterize the surface morphology of the CMPES membrane and modified membrane. The grafting yield of P (PEGMA) was determined by weight gain measurement. The results showed that the number-average molecular weight (Mn) of P (PEGMA) increased with the polymerization time. It was found that the grafting of P (PEGMA) brought higher pure water flux, improved water uptake ratio and better anti-protein absorption ability to CMPES membrane after modification.

Antifouling PVDF membrane grafted with zwitterionic poly(lysine methacrylamide) brushes

RSC Advances ◽  
2016 ◽  
Vol 6 (66) ◽  
pp. 61434-61442 ◽  
Author(s):  
Dapeng Liu ◽  
Jing Zhu ◽  
Ming Qiu ◽  
Chunju He
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Membrane Surface ◽  
Covalent Binding ◽  
Atom Transfer ◽  
Pvdf Membrane

Antifouling PVDF membranes were fabricated through the covalent binding of lysine methacrylamide (LysAA) brushes on the membrane surface via mussel-inspired surface-initiated atom transfer radical polymerization (SI-ATRP).

Wood Pulp Fibers Grafted with Polyacrylamide through Atom Transfer Radical Polymerization

2011 ◽  
Vol 396-398 ◽  
pp. 1458-1461 ◽  
Author(s):  
Xiu Mei Zhang ◽  
Jian Feng Ji ◽  
Yan Jun Tang ◽  
Yu Zhao
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Monomer Concentration ◽  
Wood Pulp ◽  
Hydroxyl Groups ◽  
Atom Transfer ◽  
Wood Fibers ◽  
Pulp Fibers ◽  
Grafting Reaction ◽  
Ft Ir

Bleached wood pulp fibers grafted with polyacrylamide (PAM) was synthesized through surface-initiated atom transfer radical polymerization (SI-ATRP) to be applied in papermaking. The ATRP macroinitiator was prepared by esterification of hydroxyl groups of wood fibers with α-bromoisobutyryl bromide (α-BIBB). The bromine atoms on the surface of the macroinitiator were characterized and calculated by FT-IR, EDXS and TGA techniques. The ATRP grafting reaction conditions of fiber-PMA were discussed and determined. To optimize the polymerization in the CuBr/PMDETA catalytic system, several influencing factors on grafting yield were investigated, including solvent, reaction temperature, monomer concentration and sacrificial initiator. The PAM grafted fibers were characterized by FT-IR and TGA analyses.

scholarly journals Reusable Surface-Modified Bacterial Cellulose Based on Atom Transfer Radical Polymerization Technology with Excellent Catalytic Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1443 ◽  
Author(s):  
Xin Li ◽  
Quan Feng ◽  
Dawei Li ◽  
Narh Christopher ◽  
Huizhen Ke ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Atom Transfer Radical Polymerization ◽  
Bacterial Cellulose ◽  
Radical Polymerization ◽  
Membrane Surface ◽  
Catalytic Performance ◽  
Reusable Catalyst ◽  
High Catalytic Activity ◽  
Atom Transfer ◽  
Surface Modified

The high catalytic activity of membrane-binding gold nanoparticles (AuNPs) makes its application in oxidation or reduction an attractive challenge. Herein, surface-functionalized bacterial cellulose (BC-poly(HEMA)) was successfully prepared with 2-hydroxyethyl methacrylate (HEMA) as monomers via the atom transfer radical polymerization (ATRP) method. BC-poly(HEMA) was further utilized as not only reducing agent but also carrier for uniform distribution of the AuNPs in the diameter of about 8 nm on the membrane surface during the synthesis stage. The synthesized AuNPs/BC-poly(HEMA) exhibited excellent catalytic activity and reusability for reducing 4-nitrophenol (4-NP) from NaBH4. The results proved that the catalytic performance of AuNPs/BC-poly(HEMA) was affected by the surrounding temperature and pH, and AuNPs/BC-poly(HEMA) maintained the extremely high catalytic activity of AuNPs/BC-poly(HEMA) even after 10 reuses. In addition, no 4-NP was detected in the degradation solution after being stored for 45 days. The reusable catalyst prepared by this work shows a potential industrial application prospect.

Hydrophilicity and anti-fouling performance of polyethersulfone membrane modified by grafting block glycosyl copolymers via surface initiated electrochemically mediated atom transfer radical polymerization

2018 ◽  
Vol 42 (4) ◽  
pp. 2692-2701 ◽  
Author(s):  
Dan Li ◽  
Jiayu Wu ◽  
Shiyuan Yang ◽  
Weijie Zhang ◽  
Xiaoqin Niu ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Membrane Surface ◽  
Atom Transfer ◽  
Polyethersulfone Membrane ◽  
Copolymer Brushes

In this study, we synthesize a modified polyethersulfone membrane to construct block copolymer brushes on the membrane surface.

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