Physicochemical Properties of Surface‐Initiated Polymer Films in the Modification and Processing of Materials

Jennings, G. Kane; Brantley, Eric L.

doi:10.1002/adma.200400810

Cited by 99 publications

(89 citation statements)

References 96 publications

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“…These are exciting developments in the field as it frees up the polymer brushes from being bound to a particular substrate making them more usable and versatile. While there are a number of review articles that have covered the various synthetic approaches for polymer brushes through polymer grafting or surface-initiated polymerization (SIP) [4,[10][11][12], in this article we will focus on the latest advances in synthetic approaches to specifically fabricate polymer brushes independent of the substrate type and their characterization. Finally we will highlight how these advances have impacted the creation of patterned polymer brushes and their subsequent chemical modification to control tissue integration and cellular adhesion.…”

Section: Introductionmentioning

confidence: 99%

From Self-Assembled Monolayers to Coatings: Advances in the Synthesis and Nanobio Applications of Polymer Brushes

et al. 2015

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Abstract:In this review, we describe the latest advances in synthesis, characterization, and applications of polymer brushes. Synthetic advances towards well-defined polymer brushes, which meet criteria such as: (i) Efficient and fast grafting, (ii) Applicability on a wide range of substrates; and (iii) Precise control of surface initiator concentration and hence, chain density are discussed. On the characterization end advances in methods for the determination of relevant physical parameters such as surface initiator concentration and grafting density are discussed. The impact of these advances specifically in emerging fields of nano-and bio-technology where interfacial properties such as surface energies are controlled to create nanopatterned polymer brushes and their implications in mediating with biological systems is discussed.

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Section: Introductionmentioning

confidence: 99%

From Self-Assembled Monolayers to Coatings: Advances in the Synthesis and Nanobio Applications of Polymer Brushes

et al. 2015

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“…Such postpolymerization reaction routes commonly lead to the formation of random copolymers ͑RCPs͒, as reported earlier by several groups. 24,33,34 The amount of modifying agent that produces fHEMA units as well as the distribution of the two comonomers, HEMA and fHEMA, will depend on several system parameters, including ͑1͒ grafting density ͑ PHEMA ͒ and ͑2͒ molecular weight ͑M PHEMA ͒ of the parent PHEMA homopolymer brush, ͑3͒ the size of the fluorinating agent, and ͑4͒ the reactivity between the function group on the parent homopolymer brush ͑-OH in the ase of PHEMA͒ and the head group present in the modifying agent. Previous theoretical and experimental studies on polymer/nanoparticle hybrids prepared by diffusing nanoparticles inside swollen homopolymer brushes have provided clear evidence that the penetration depth of the particles depends on the interplay between the size of the particle and the grafting density and molecular weight of the brush.…”

Section: Resultsmentioning

confidence: 99%

“…[21][22][23][24][25] Three different acylchlorides were employed ͑all obtained from Sigma-Aldrich͒: heptafluorobutyryl chloride ͑C 3 F 7 COCl, F3͒, pentadecafluoro-octanoyl chloride ͑C 7 F 15 COCl, F7͒, and pentafluorobenzoyl chloride ͑C 6 F 5 COCl, PFA͒. Substrates with PHEMA brushes were exposed to 80 mM solutions of a given acylchloride with 100 mM pyridine in dichloromethane for 24 h at room temperature to modify PHEMA films with fluorinated side chains ͑see Fig.…”

Section: B Fluorination Of Phema Brushesmentioning

confidence: 99%

Formation of surface-grafted polymeric amphiphilic coatings comprising ethylene glycol and fluorinated groups and their response to protein adsorption

et al. 2009

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Amphiphilic polymer coatings were prepared by first generating surface-anchored polymer layers of poly(2-hydroxyethyl methacrylate) (PHEMA) on top of flat solid substrates followed by postpolymerization reaction on the hydroxyl terminus of HEMA’s pendent group using three classes of fluorinating agents, including organosilanes, acylchlorides, and trifluoroacetic anhydride (TFAA). The distribution of the fluorinated groups inside the polymer brushes was assessed by means of a suite of analytical probes, including contact angle, ellipsometry, infrared spectroscopy, atomic force microscopy, and near-edge x-ray absorption fine structure spectroscopy. While organosilane modifiers were found to reside primarily close to the tip of the brush, acylchlorides penetrated deep inside PHEMA thus forming random copolymers P(HEMA-co-fHEMA). The reaction of TFAA with the PHEMA brush led to the formation of amphiphilic diblocks, PHEMA-b-P(HEMA-co-fHEMA), whose bottom block comprised unmodified PHEMA and the top block was made of P(HEMA-co-fHEMA) rich in the fluorinated segments. This distribution of the fluorinated groups endowed PHEMA-b-P(HEMA-co-fHEMA) with responsive properties; while in hydrophobic environment P(HEMA-co-fHEMA) segregated to the surface, when in contact with a hydrophilic medium, PHEMA partitioned at the brush surface. The surface activity of the amphiphilic coatings was tested by studying the adsorption of fibrinogen (FIB). While some FIB adsorption occurred on most coatings, the ones made by TFAA modification of PHEMA remained relatively free of FIB.

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“…Mixed polymer brushes with hydrophobic and hydrophilic blocks were used and fixed to a substrate. After exposure to different solvents, the organization of these chains can be highly affected as shown in Figure 9 [62,63].…”

Section: Solvent and Gasmentioning

confidence: 99%

Switchable and Reversible Superhydrophobic Surfaces: Part Two

Taleb¹,

Darmanin²,

Guittard³

2018

Interdisciplinary Expansions in Engineering and Design With the Power of Biomimicry

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In this book chapter, most of the methods used in the literature to prepare switchable and reversible superhydrophobic surfaces are described. Inspired by Nature, it is possible to induce the Cassie-Baxter-Wenzel transition using different external stimuli such as light, temperature, pH, ion exchange, voltage, magnetic field, mechanic stress, plasma, ultrasonication, solvent, gas or guest. Such properties are extremely important for various applications but especially for controllable oil/water separation membranes, oil-absorbing materials, and water harvesting systems.Keywords: superhydrophobic, reversible, switchable, bioinspiration, biomimetism Reversible superhydrophobic surfaces: Part twoThis section provides continuation of the description of the stimuli used in the literature to induce reversible changes in surface wettability. Ion exchangeSince 2004, the researchers have shown that the presence of charged species such as quaternary ammonium groups are sensitive to ion exchange and lead to different surface wettabilities. In 2004, Choi et al. prepared self-assembled monolayers (SAM) with imidazolium groups on smooth Au and Si/SiO 2 substrates [1][2][3]. They studied the effect of a series of anions as shown in Figure 1 and In order to elaborate reversible superhydrophobic properties by ion exchange, gold micro and nanostructured substrates were performed by electroless etching process by immersing silicon substrates in aqueous solution of HAuCl 4 and HF (Figure 2). The surface was then modified by SAM using a thiol terminated by a quaternary ammonium. Then, the surface wettability could be reversely changed from superhydrophilic to superhydrophobic after [20]. Here, the presence of TSPM (sol-gel precursor) was used not only to form a polymer network via intramolecular interactions but also to anchor substrates (Figure 3). The membranes could reversely change from superhydrophobic/highly oleophobic to superhydrophilic/superoleophobic after exchanging Cl − ions by heptadecafluorooctanesulfonic acid (C 8 F 17 SO 3 − or HPS − ) ions. Moreover, the membranes were also highly efficient filter medium for removing multiple contaminants such as SO 2 form waster gas streams. A nother strategy was to deposit polyelectrolyte multilayers poly(diallyldimethylammonium chloride (PDDA) and poly(sodium 4-styrenesulfonate) (PSS) on gold micro and nanostructured substrates [21]. The authors studied the influence of the exchanged ions and the highest properties were obtained by exchanging Cl − (θ w < 5°) ions by PFO − (θ w = 164°). The authors also deposited polyelectrolyte multilayers on micro and nanostructured aluminum substrates obtained by etching in HCl and immersion in boiling water [22,23]. Using PFO − ions, the substrates were superhydrophobic and superoleophobic. When the substrates were immersed in seawater, the PFO − ions were exchanged by hydrophilic Cl − or SO 4 2− making the substrates underwater superoleophobic. Magnetic fieldEnvironment protection against oil leakage during oil tankers sinking is ...

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Physicochemical Properties of Surface‐Initiated Polymer Films in the Modification and Processing of Materials

Cited by 99 publications

References 96 publications

From Self-Assembled Monolayers to Coatings: Advances in the Synthesis and Nanobio Applications of Polymer Brushes

From Self-Assembled Monolayers to Coatings: Advances in the Synthesis and Nanobio Applications of Polymer Brushes

Formation of surface-grafted polymeric amphiphilic coatings comprising ethylene glycol and fluorinated groups and their response to protein adsorption

Switchable and Reversible Superhydrophobic Surfaces: Part Two

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