Construction of catechol-containing semi-fluorinated asymmetric polymer brush via successive RAFT polymerization and ATRP

2017 ◽  
Vol 8 (48) ◽  
pp. 7499-7506 ◽  
Author(s):  
Binbin Xu ◽  
Xiaowen Sun ◽  
Chaoqun Wu ◽  
Jianhua Hu ◽  
Xiaoyu Huang
Keyword(s):  
Raft Polymerization ◽  
Polymer Brush ◽  
Heterogeneous Polymer

This article reports the synthesis of a semi-fluorinated compositional heterogeneous polymer brush for anti-fouling surface.

scholarly journals P4VP Modified Zwitterionic Polymer for the Preparation of Antifouling Functionalized Surfaces

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 706 ◽  
Author(s):  
Chaoqun Wu ◽  
Yudan Zhou ◽  
Haitao Wang ◽  
Jianhua Hu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Cell Attachment ◽  
Raft Polymerization ◽  
Polymer Brush ◽  
Contact Angles ◽  
Polymerization Process ◽  
Water Contact ◽  
Zwitterionic Polymers ◽  
Ito Glass ◽  
Zwitterionic Polymer

Zwitterionic polymers are suitable for replacing poly(ethylene glycol) (PEG) polymers because of their better antifouling properties, but zwitterionic polymers have poor mechanical properties, strong water absorption, and their homopolymers should not be used directly. To solve these problems, a reversible-addition fragmentation chain transfer (RAFT) polymerization process was used to prepare copolymers comprised of zwitterionic side chains that were attached to an ITO glass substrate using spin-casting. The presence of 4-vinylpyridine (4VP) and zwitterion chains on these polymer-coated ITO surfaces was confirmed using 1H NMR, FTIR, and GPC analyses, with successful surface functionalization confirmed using water contact angle, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) studies. Changes in water contact angles and C/O ratios (XPS) analysis demonstrated that the functionalization of these polymers with β-propiolactone resulted in hydrophilic mixed 4VP/zwitterionic polymers. Protein adsorption and cell attachment assays were used to optimize the ratio of the zwitterionic component to maximize the antifouling properties of the polymer brush surface. This work demonstrated that the antifouling surface coatings could be readily prepared using a “P4VP-modified” method, that is, the functionality of P4VP to modify the prepared zwitterionic polymer. We believe these materials are likely to be useful for the preparation of biomaterials for biosensing and diagnostic applications.

Micro-patterned polymer brushes by a combination of photolithography and interface-mediated RAFT polymerization for DNA hybridization

2015 ◽  
Vol 6 (38) ◽  
pp. 6812-6818 ◽  
Author(s):  
Dilek Cimen ◽  
Tuncer Caykara
Keyword(s):  
Dna Hybridization ◽  
Polymer Brushes ◽  
Raft Polymerization ◽  
Polymer Brush

A novel micro-patterned poly(AHMA) brush was prepared by a combination of photolithography and interface mediated RAFT polymerization for DNA hybridization. By this method, highly resolved micro-patterned polymer brush structures down to ∼2.0 μm lines were obtained.

Gold nanoparticle-conjugated heterogeneous polymer brush-wrapped cellulose nanocrystals prepared by combining different controllable polymerization techniques for theranostic applications

2016 ◽  
Vol 7 (18) ◽  
pp. 3107-3116 ◽  
Author(s):  
Hao Hu ◽  
Xiu-Ju Hou ◽  
Xiao-Chen Wang ◽  
Jing-Jun Nie ◽  
Qing Cai ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Cellulose Nanocrystals ◽  
Polymer Brushes ◽  
Polymer Brush ◽  
Au Nanoparticle ◽  
Heterogeneous Polymer ◽  
Theranostic Applications

Spindly cellulose nanocrystals were coated with Au nanoparticle-conjugated heterogeneous polymer brushes prepared via different controllable polymerization.

Synthesis of poly(N-(2-hydroxypropyl) methacrylamide) brushes by interface-mediated RAFT polymerization

RSC Advances ◽  
2016 ◽  
Vol 6 (51) ◽  
pp. 45259-45264 ◽  
Author(s):  
Ertan Yildirim ◽  
Dilek Cimen ◽  
Adem Zengin ◽  
Tuncer Caykara
Keyword(s):  
Raft Polymerization ◽  
Polymer Brush ◽  
Moderate Density ◽  
Hydroxypropyl Methacrylamide

A novel poly(N-(2-hydroxypropyl) methacrylamide) [poly(HPMA)] brush with a moderate density polymer brush (0.52 chains per nm2) was synthesized by an interface-mediated RAFT polymerization.

One-pot polymer brush synthesis via simultaneous isocyanate coupling chemistry and “grafting from” RAFT polymerization

2014 ◽  
Vol 5 (8) ◽  
pp. 2816-2823 ◽  
Author(s):  
S. P. Le-Masurier ◽  
G. Gody ◽  
S. Perrier ◽  
A. M. Granville
Keyword(s):  
Chain Transfer ◽  
Raft Polymerization ◽  
Polymer Brush ◽  
One Pot ◽  
Reversible Addition ◽  
Raft Agent ◽  
Grafting From

One-pot ‘grafting from’ of polystyrene on polydopamine particles was investigated using a newly developed carbonyl-azide reversible addition–fragmentation chain transfer (RAFT) agent.

scholarly journals Towards a Polymer-Brush-Based Friction Modifier for Oil

2021 ◽  
Vol 69 (4) ◽  
Author(s):  
Tobias A. Gmür ◽  
Joydeb Mandal ◽  
Juliette Cayer-Barrioz ◽  
Nicholas D. Spencer
Keyword(s):  
Block Copolymers ◽  
Raft Polymerization ◽  
Film Formation ◽  
Polymer Brush ◽  
Friction Reduction ◽  
Friction Modifier ◽  
Molecular Weights ◽  
Sliding Surfaces ◽  
Reversible Addition ◽  
Anchoring Groups

AbstractTo meet the need for oil-compatible friction modifier additives that can significantly reduce energy consumption in the boundary-lubrication regime, a macromolecular design approach has been taken. The aim was to produce a lubricious polymer film on the sliding surfaces. A series of readily functionalizable block copolymers carrying an oleophilic poly(dodecyl methacrylate) block and a functionalizable poly(pentafluorophenyl methacrylate) block of various lengths was synthesized by means of reversible addition-fragmentation chain-transfer (RAFT) polymerization. The poly(pentafluorophenyl methacrylate) block was used to attach surface-active nitrocatechol anchoring groups to the polymer. The friction-reduction properties of these polymers were assessed with 0.5 wt% solutions in hexadecane by means of rolling-sliding macroscopic tribological tests. Block copolymers with roughly equal block lengths and moderate molecular weights were significantly more effective at friction reduction than all other architectures investigated. They also displayed lower friction coefficients than glycerol monooleate—a commercially used additive. The film-formation ability of these polymers was examined using a quartz-crystal microbalance with dissipation (QCM-D), by monitoring their adsorption onto an iron oxide-coated QCM crystal. The polymer with highest lubrication efficiency formed a thin film of ~ 17 nm thickness on the crystal, indicating the formation of a polymer brush. Interferometric rolling-sliding experiments with the same polymer showed a separating film thickness of ~ 20 nm, which is consistent with the QCM-D value, bearing in mind the compression of the adsorbed layers on the two sliding surfaces during tribological testing. Graphical Abstract

scholarly journals Towards a Polymer-Brush-Based Friction Modifier for Oil

2021 ◽  
Author(s):  
Tobias A. Gmür ◽  
Joydeb Mandal ◽  
Juliette Cayer-Barrioz ◽  
Nicholas D. Spencer
Keyword(s):  
Iron Oxide ◽  
Block Copolymers ◽  
Raft Polymerization ◽  
Film Formation ◽  
Polymer Brush ◽  
Friction Reduction ◽  
Friction Modifier ◽  
Molecular Weights ◽  
Reversible Addition ◽  
Anchoring Groups

Abstract In the search for new, oil-compatible friction-modifier additives that can significantly reduce energy consumption by reducing the friction in the boundary-lubrication regime, a macromolecular-design approach has been taken. This involved the synthesis of a series of readily functionalizable block copolymers carrying an oleophilic poly(lauryl methacrylate) block and a functionalizable poly(pentafluorophenyl methacrylate) block of various lengths by means of reversible addition-fragmentation chain-transfer (RAFT) polymerization. The poly(pentafluorophenyl methacrylate) block was used to attach surface-active nitro-catechol anchoring groups to the polymer. The friction-reduction properties of these polymers were assessed using 0.5 wt.% solutions in hexadecane using rolling-sliding macroscopic tribological tests. Block copolymers with roughly equal block lengths and moderate molecular weights were significantly more effective at friction reduction than all other architectures investigated. They also displayed lower friction coefficients than glycerol monooleate, a commercially used additive. The film formation ability of these polymers was examined using a quartz-crystal microbalance with dissipation (QCM-D), by monitoring their adsorption onto an iron-oxide coated QCM crystal. The polymer with highest lubrication efficiency formed a thin film of ∼17 nm thickness on the iron-oxide coated QCM crystal, consistent with the formation of a polymer brush. Interferometric rolling-sliding experiments with the same polymer showed a separating film thickness of ∼20 nm, which is consistent with the QCM-D value, bearing in mind the compression of the adsorbed layers on the two sliding surfaces during tribological testing.

Polymer brush with pendent glucosylurea groups constructed on a glass substrate by RAFT polymerization

2012 ◽  
Vol 48 (11) ◽  
pp. 1875-1882 ◽  
Author(s):  
Hiromi Kitano ◽  
Yan Liu ◽  
Ken-ichi Tokuwa ◽  
Lifu Li ◽  
Shintaroh Iwanaga ◽  
...  
Keyword(s):  
Glass Substrate ◽  
Raft Polymerization ◽  
Polymer Brush
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