Room-Temperature, Aqueous-Phase Fabrication of Poly(methacrylic acid) Brushes by UV-LED-Induced, Controlled Radical Polymerization with High Selectivity for Surface-Bound Species

Heeb, R.; Bielecki, Robert M.; Lee, Sang M.; Spencer, Nicholas D.

doi:10.1021/ma901607w

Cited by 80 publications

(77 citation statements)

References 53 publications

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“…PDMS samples were prepared with a Sylgard® 184 kit (Dow Corning, Midland, MI) according to a standard procedure [5,6]. The diameter/thickness of disk was 30/5 mm and the radius of pin was 3 mm.…”

Section: Methodsmentioning

confidence: 99%

Self-restoring polymer brushes under tribological stress and the biomedical applications

et al. 2016

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For biological and mechanical systems involving moving parts, surface slipperiness is often a critical attribute for their optimal functions. Surface grafting with hydrophilic polymers is a powerful means to render materials slippery in aqueous environment. In "inverted grafting-to approach", the hydrophilic polymer chains of amphiphilic diblock copolymers dispersed within a poly(dimethylsiloxane) (PDMS) network are selectively segregated upon exposure to aqueous solution. This allows formation of extremely stable brush-like polymer layers. Tribological application of inverted grafting-to approach was successfully demonstrated with PDMS-blockpoly(acrylic acid) (PDMS-b-PAA) dispersed within thin PDMS films on PDMS blocks by showing friction coefficients (µ) of ca 10 -2 to 10 -3 , depending on the load, pH and buffer salinity in the absence of other external re-supply of PAA chains. Further manipulations of the thin PDMS film incorporating PDMS-b-PAA to optimize the tribological properties are presented. Lastly, first trials to employ PAA-grafted PDMS surface to generate in-vitro mucosae model are also presented and discussed.

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Section: Methodsmentioning

confidence: 99%

Self-restoring polymer brushes under tribological stress and the biomedical applications

et al. 2016

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“…Spencer et al have used a photoinduced "grafting from" approach to grow polymethacrylic acid (PMAA) brushes on Si/SiO 2 surfaces, and investigated the lubrication properties of the PMAA brushes of different molecular weights and soft, hydrophilic ox-PDMS pins in macroscopic tribological experiments under lowcontact-pressure, aqueous conditions [36]. The results showed that the PMAA brushes could not be distinguished from the μ vs. sliding speed plots, and long-term stability of the short 15 nm PMAA brushes showed to be inferior to that of long brushes (240 nm dry thickness).…”

Section: Improved Aqueous Lubrication By Surface Grafted Polymer Brushesmentioning

confidence: 99%

Physicochemistry aspects on frictional interfaces

Zhou

Liu

2017

Friction

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Friction exists wherever relative motion occurs and is the main source of energy consumption. Lubrication plays a significant role in improving fuel efficiency, reducing emissions, and prolonging the service life of machines. Surface interactions between two moving solid surfaces or the flow of a fluid (and/or environment) on a solid surface are the primary causes of friction. Apart from the mechanical design of moving parts, surface physicochemistry is of crucial importance to lubrication. This review deals with the frontier research on controlling friction and lubrication, highlights the importance of physicochemistry aspects, and enumerates the state-of-the-art chemistry solutions to tribological issues. It aims at inspiring talented young scientists from different fields to make significant contributions to the area.

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“…21. [279][280][281] The mechanism in which solvated polymer brushes lubricate is thought to be as follows. 27 Tribological studies were conducted using a ball on disk NTR2 tribometer in a reciprocating motion over 120 with the speed change being controlled sinusoidally.…”

Section: Polymer Brushes On Silicon Wafers For Tribological Applicationsmentioning

confidence: 99%

Challenges and developments of self-assembled monolayers and polymer brushes as a green lubrication solution for tribological applications

et al. 2015

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ab Self-assembled monolayers (SAMs), after originally being investigated due to their functions in changing surface wettability, have been significantly developed over the years. Many types of SAMs have been developed on a variety of substrates. However their formation mechanism, rate and quality are found to be influenced by many factors. A range of SAMs including single-and multi-component are included in this review with focus on the nano and macro tribological properties. More recently, surface initiated polymer brushes, i.e. macromolecular assemblies attached to a substrate, have emerged to be an alternative and promising method for surface modification. The ability to tether these macromolecules to tribological contacts is key to their resistance to shear under loaded contacts. This review also covers atom transfer radical polymerisation (ATRP) and the role of this technique in developing new lubrication solutions. Particular care has been taken to include the development of lubrication solutions for silicon nitride due to the importance of this material as an engineering ceramic. This paper reviews the stateof-the-art development of SAMs and polymer brushes especially the potential opportunities and challenges in applying them in tribological contacts as a lubrication solution.

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Room-Temperature, Aqueous-Phase Fabrication of Poly(methacrylic acid) Brushes by UV-LED-Induced, Controlled Radical Polymerization with High Selectivity for Surface-Bound Species

Cited by 80 publications

References 53 publications

Self-restoring polymer brushes under tribological stress and the biomedical applications

Self-restoring polymer brushes under tribological stress and the biomedical applications

Physicochemistry aspects on frictional interfaces

Challenges and developments of self-assembled monolayers and polymer brushes as a green lubrication solution for tribological applications

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