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Type: Journal article
Title: Polymer brush gradients grafted from plasma-polymerized surfaces
Author: Coad, B.
Bilgic, T.
Klok, H.
Citation: Langmuir: the ACS journal of surfaces and colloids, 2014; 30(28):8357-8365
Publisher: American Chemical Society
Issue Date: 2014
ISSN: 0743-7463
Statement of
Bryan R. Coad, Tugba Bilgic, and Harm-Anton Klok
Abstract: A new method for generating a surface density gradient of polymer chains is presented. A substrate-independent polymer deposition technique was used to coat materials with a chemical gradient based on plasma copolymerization of 1,7-octadiene and allylamine. This provided a uniform chemical gradient to which initiators for atom transfer radical polymerization (ATRP) were immobilized. After surface-initiated atom transfer radical polymerization (SI-ATRP), poly(2-hydroxyethyl methacrylate) (PHEMA) chains were grafted from the surface and the measured thickness profiles provided direct evidence for how surface crowding provides an entropic driving force resulting in chain extension away from the surface. Film thicknesses were found to increase with the position along the gradient surface, reflecting the gradual transition from collapsed to more extended surface-tethered polymer chains as the grafting density increased. The method described is novel in that the approach provides covalent linkages from the polymer coating to the substrate and is not limited to a particular surface chemistry of the starting material.
Description: Published: June 26, 2014
Rights: © 2014 American Chemical Society
DOI: 10.1021/la501380m
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Appears in Collections:Agriculture, Food and Wine publications
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