Antibacterial behavior of halloysite nanotubes decorated with copper nanoparticles in a novel mixed matrix membrane for water purification

2015 ◽  
Vol 1 (6) ◽  
pp. 874-881 ◽  
Author(s):  
Linlin Duan ◽  
Qianqian Zhao ◽  
Jindun Liu ◽  
Yatao Zhang
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Copper Nanoparticles ◽  
Water Purification ◽  
Halloysite Nanotubes ◽  
Mixed Matrix Membrane ◽  
Atom Transfer ◽  
Mixed Matrix ◽  
Molecular Weights

Poly(4-vinylpyridine) (P4VP) with various molecular weights was grafted onto halloysite nanotubes (HNTs) via reverse atom transfer radical polymerization (RATRP).

scholarly journals Enhanced separation and antifouling performance of reverse osmosis membrane incorporated with carbon nanotubes functionalized by atom transfer radical polymerization

RSC Advances ◽  
2017 ◽  
Vol 7 (74) ◽  
pp. 46969-46979 ◽  
Author(s):  
Man Zhao ◽  
Shancan Fu ◽  
Huifeng Zhang ◽  
Hai Huang ◽  
Yangyang Wei ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Reverse Osmosis ◽  
Atom Transfer ◽  
Reverse Osmosis Membrane ◽  
Elemental Mapping ◽  
Mixed Matrix ◽  
Functionalized Mwcnts

TEM and HAADF-STEM-EDS merged elemental mapping images of functionalized MWCNTs, and antifouling mechanism of mixed-matrix RO membranes.

Synthesis of Imidazole End-Capped Poly(n-butyl methacrylate)s via Atom Transfer Radical Polymerization with a new functional initiator containing imidazolium group

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Aihua Zhu ◽  
Zhi Wang ◽  
Meiran Xie ◽  
Yiqun Zhang
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Butyl Methacrylate ◽  
Polymerization Temperature ◽  
Atom Transfer ◽  
Molecular Weights ◽  
System A ◽  
Rate Of Polymerization ◽  
Different Temperatures ◽  
Optimal Reaction Temperature

AbstractThe synthesis of imidazole end-capped poly(n-butyl methacrylate)s via atom transfer radical polymerization (ATRP) is reported. n-Butyl methacrylate (n- BMA) was polymerized in isopropyl alcohol (IPA) at different temperatures via ATRP using a new N-heterocyclic functional initiator (1-α-bromoisobutylimidazole, BrBI) in the presence of CuBr/2,2’-bipyridine (bpy) as the catalyst. With this new initiating system, a successful ATRP of n-BMA was carried out, and imidazole endcapped polymers with predetermined molecular weights and low polydispersities (1.1<PDI<1.3) were obtained at low polymerization temperature (below 80 °C). Furthermore, the dependence of both the rate of polymerization and PDI on temperature gave the optimal reaction temperature (50 °C). However, at elevated temperature (especially above 80 °C), some different phenomena appeared in the polymerization: the conversion of monomer remains constant after reaching a maximum value (20%-30%), and the higher the temperature, the lower the conversion obtained.

High-throughput experimentation applied to atom transfer radical polymerization: Automated optimization of the copper catalysts removal from polymers

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Huiqi Zhang ◽  
Caroline H. Abeln ◽  
Martin W. M. Fijten ◽  
Ulrich S. Schubert
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
High Throughput ◽  
Copper Catalysts ◽  
Atom Transfer ◽  
Throughput Optimization ◽  
Polymer Science ◽  
Molecular Weights ◽  
High Throughput Experimentation ◽  
Automated Optimization

AbstractCombinatorial chemistry and high-throughput experimentation have drawn great attention in recent years because of their significant advantages in increasing the research productivity. One of the emerging fields is their application in polymer science. Herein we describe the high-throughput optimization of purification conditions for polymers prepared via atom transfer radical polymerization using an automated synthesizer. The effects of the column materials, column lengths and eluent volumes on the purification efficiency as well as the molecular weights of the obtained purified polymers were systematically investigated for the first time. The optimum purification conditions for the removal of copper catalysts are provided. As a result an online high-throughput purification workflow using SPE cartridges is now available for the utilization in automated parallel synthesizers for ATRP screening experiment.

scholarly journals Poly (Ethylene Oxide)-Based Block Copolymer Electrolytes Formed via Ligand-Free Iron-Mediated Atom Transfer Radical Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 763 ◽  
Author(s):  
Sibo Li ◽  
Mengying Tian ◽  
Jirong Wang ◽  
Feipeng Du ◽  
Liang Li ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Atom Transfer ◽  
Poly Ethylene Glycol ◽  
Molecular Weights ◽  
Ligand Free ◽  
Coordination Effect ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The Br-terminated poly (ethylene oxide) (PEO-Br) is used as a green and efficient macroinitiator in bulk Fe-catalyzed atom transfer radical polymerization (ATRP) without the addition of any organic ligands. The polymerization rate is able to be mediated by PEO-Br with various molecular weights, and the decrease in redox potential of FeBr2 in cyclic voltammetry (CV) curves indicates that an increased coordination effect is deteriorated with the depressing reaction activity in the longer ethylene oxide (EO) chain in PEO-Br. In combination with the study of different catalysts and catalytic contents, the methyl metharylate (MMA) or poly (ethylene glycol) monomethacrylate (PEGMA) was successfully polymerized with PEO-Br as an initiator. This copolymer obtained from PEGMA polymerization can be further employed as a polymer matrix to form the polymer electrolyte (PE). The higher ionic conductivity of PE was obtained by using a high molecular weight of copolymer.

Atom transfer radical polymerization of styrene initiated by the novel initiator N-bromosuccinimide

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Wei Zhang ◽  
Xiulin Zhu ◽  
Jian Zhu
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Monomer Conversion ◽  
Chain Extension ◽  
Atom Transfer ◽  
The Novel ◽  
Molecular Weights ◽  
H Nmr ◽  
Initiation System ◽  
Low Efficiency

Abstract Heterogeneous atom transfer radical polymerization of styrene initiated by N-bromosuccinimide in bulk was successfully carried out with CuBr/2,2’-bipyridine as the catalyst. The kinetics follow first order in monomer and molecular weights (polydispersities Mw/Mn = 1.23 - 1.66) increase linearly with monomer conversion, indicating the ‘living’/controlled nature of the polymerization. However, the number-average molecular weights were usually higher than the theoretical ones. That demonstrates the relatively low efficiency of the initiator, the causes of which are discussed. The obtained polystyrenes functionalized with α-α-pyrrolidine- 2,5-dionyl and ω-Br as the end groups were characterized by 1H NMR spectroscopy. They can be used as macroinitiators for chain extension reaction. A polymerization mechanism for this novel initiation system is proposed.

scholarly journals Synthesis of polystyrene-block-poly(iso-butyl vinyl ether) by dinuclear half-metallocene catalyst and atom transfer radical polymerization

2015 ◽  
Vol 18 (3) ◽  
pp. 189-199
Author(s):  
Thanh Thi Le Nguyen ◽  
Nhon Thi Le Nguyen
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Vinyl Ether ◽  
Metallocene Catalyst ◽  
Gel Permeation Chromatography ◽  
Atom Transfer ◽  
Narrow Molecular Weight Distribution ◽  
Molecular Weights ◽  
Gel Permeation ◽  
Half Sandwich

The synthesis of polystyrene-block-poly(iso-butyl vinyl ether) by using the combination of metallocene catalyst and atom transfer radical polymerization (ATRP) has been tried. This synthetic method takes advantages of both metallocene catalyst to form stereoregular polymer with high activity and ATRP with the controlled molecular weights and low polydispersity. The recent dinuclear half-sandwich complexes of titanium with xylene bridge, [Ti(η5-cyclopentadienyl)Cl2L]2-ortho, meta-[CH2-C6H4-CH2] (L = Cl, L = O-2,6-iPr2C6H3 ) were successfully synthesized. These catalysts were characterized by 1H NMR, 13C NMR and elemental analysis. Copolymers have been characterized by using gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR). The collected copolymers have got narrow molecular weight distribution (≤1.8) and the improvement of stereoregularity (racemo dyads, r, are from 45 % to 56 %).

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