Tribology of surface-grafted polymer brushes

Mocny, Piotr; Klok, Harm‐Anton

doi:10.1039/c5me00010f

Cited by 57 publications

(54 citation statements)

References 86 publications

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“…[1] Thee xtended chain conformation is an important contributor to for example,t he nonbiofouling [2] and lubrication properties [3] of hydrophilic polymer brushes prepared by SIP. [1] Thee xtended chain conformation is an important contributor to for example,t he nonbiofouling [2] and lubrication properties [3] of hydrophilic polymer brushes prepared by SIP.…”

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confidence: 99%

Swelling‐Induced Chain Stretching Enhances Hydrolytic Degrafting of Hydrophobic Polymer Brushes in Organic Media

Wang

Klok

2019

Angew Chem Int Ed

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Hydrophilic polymer brushes grown via surfaceinitiated polymerization from silicon oxide surfaces can detach or degraft in aqueous media. Degrafting of these chain endtethered polymers is believed to involve hydrolysis of bonds at the polymer-substrate interface.Degrafting so far has not been reported for hydrophobic polymer brushes in non-aqueous media. This study has investigated the degrafting and swelling properties of poly(tert-butyl methacrylate) (PtBMA) brushes in different water-miscible,organic solvents,viz. DMF,acetone and THF.Inthe presence of asufficient quantity of water in the organic solvent, degrafting was also observed for PtBMA brushes.M ore importantly,h owever,t he rate of degrafting depended on the nature of the organic solvent and the apparent initial rate constant of the degrafting reaction was found to correlate with the swelling ratio of the polymer brush in the different solvents.T his correlation is first, direct evidence in support of the hypothesis that degrafting is facilitated by atension that acts on the bond(s) that tether the polymer chains to the surface and whichi sa mplified upon swelling of the polymer brush.Scheme 1. Preparation of PtBMA brushes via SI-ATRP.

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Swelling‐Induced Chain Stretching Enhances Hydrolytic Degrafting of Hydrophobic Polymer Brushes in Organic Media

Wang

Klok

2019

Angew Chem Int Ed

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“…Thus, decreasing friction is not only of great technological relevance, but also critical for ensuring the smooth and painless movement of joints in the human body. In this context, surface‐grafted polyelectrolyte brushes are a very attractive class of aqueous boundary lubricants . Much of the current interest and activities in this area are based on pioneering work by Klein and co‐workers.…”

Section: Polyelectrolyte‐brush‐based Boundary Lubricantsmentioning

confidence: 99%

“…Friction occurs when two surfaces that are in contact slide against each other.A pplications include gearwheels (both in large industrial equipmenta nd in small wrist watches) and the movement of the hip and knee joints.T hus, decreasingf riction is not only of great technological relevance, but also critical for ensuring the smooth and painless movement of joints in the human body.I nt his context, surface-grafted polyelectrolyte brushesa re av ery attractive class of aqueous boundary lubricants. [59] Much of the current interesta nd activities in this area are based on pioneering work by Klein and co-workers.I nt heir 2009 paper,t hesea uthorsr eported that zwitterionic PMPC brushesw ere able to provide extremelye fficient lubrication in aqueous media. [11b] For these brushes, friction coefficients of m % 0.001 were measureda tp ressures of up to 7.5 MPa, which were comparable to those in the synovial joints of humans.…”

Section: Polyelectrolyte-brush-based Boundary Lubricantsmentioning

confidence: 99%

Structure and Functionality of Polyelectrolyte Brushes: A Surface Force Perspective

Billing

Ruths

et al. 2018

Chemistry An Asian Journal

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The unique functionality of polyelectrolyte brushes depends on several types of specific interactions, including solvent structure effects, hydrophobic forces, electrostatic interactions, and specific ion interactions. Subtle variations in the solution environment can lead to conformational and surface structural changes of the polyelectrolyte brushes, which are mainly discussed from a surface-interaction perspective in this Focus Review. A brief overview is given of recent theoretical and experimental progress in the structure of polyelectrolyte brushes in various environments. Two important techniques for surface-force measurements are described, the surface forces apparatus (SFA) and atomic force microscopy (AFM), and some recent results on polyelectrolyte brushes are shown. Lastly, this Focus Review highlights the use of these surface-grafted polyelectrolyte brushes in the creation of functional surfaces for various applications, including nonfouling surfaces, boundary lubricants, and stimuli-responsive surfaces.

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“…Surface-initiated polymerization (SIP) reactions provide access to chain end-tethered polymer assemblies ("polymer brushes") in which neighboring polymer chains are anchored at intermolecular distances that enforce as tretched chain conformation. [1] Thee xtended chain conformation is an important contributor to for example,t he nonbiofouling [2] and lubrication properties [3] of hydrophilic polymer brushes prepared by SIP.…”

mentioning

confidence: 99%

Swelling‐Induced Chain Stretching Enhances Hydrolytic Degrafting of Hydrophobic Polymer Brushes in Organic Media

Wang

Klok

2019

Angewandte Chemie

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Hydrophilic polymer brushes grown via surfaceinitiated polymerization from silicon oxide surfaces can detach or degraft in aqueous media. Degrafting of these chain endtethered polymers is believed to involve hydrolysis of bonds at the polymer-substrate interface.Degrafting so far has not been reported for hydrophobic polymer brushes in non-aqueous media. This study has investigated the degrafting and swelling properties of poly(tert-butyl methacrylate) (PtBMA) brushes in different water-miscible,organic solvents,viz. DMF,acetone and THF.Inthe presence of asufficient quantity of water in the organic solvent, degrafting was also observed for PtBMA brushes.M ore importantly,h owever,t he rate of degrafting depended on the nature of the organic solvent and the apparent initial rate constant of the degrafting reaction was found to correlate with the swelling ratio of the polymer brush in the different solvents.T his correlation is first, direct evidence in support of the hypothesis that degrafting is facilitated by atension that acts on the bond(s) that tether the polymer chains to the surface and whichi sa mplified upon swelling of the polymer brush. Scheme 1. Preparation of PtBMA brushes via SI-ATRP.

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Tribology of surface-grafted polymer brushes

Abstract: The tribological properties, lubrication mechanism, characterization methods and potential applications of surface-attached polymer-based boundary lubricants are reviewed.

Cited by 57 publications

References 86 publications

Swelling‐Induced Chain Stretching Enhances Hydrolytic Degrafting of Hydrophobic Polymer Brushes in Organic Media

Swelling‐Induced Chain Stretching Enhances Hydrolytic Degrafting of Hydrophobic Polymer Brushes in Organic Media

Structure and Functionality of Polyelectrolyte Brushes: A Surface Force Perspective

Swelling‐Induced Chain Stretching Enhances Hydrolytic Degrafting of Hydrophobic Polymer Brushes in Organic Media

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