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Investigation of Thermoresponsive Nano-Confined Polymer Brushes by AFM-Based Force Spectroscopy

✍ Scribed by Sadia Radji; Halima Alem; Sophie Demoustier-Champagne; Alain M. Jonas; Stéphane Cuenot

Publisher: John Wiley and Sons
Year: 2012
Tongue: English
Weight: 520 KB
Volume: 213
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.201100636

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✦ Synopsis

Abstract

PNIPAM polymer brushes are synthesized in nanopores of track‐etched membranes. The internal structure of these nano‐confined brushes is studied by AFM force spectroscopy experiments as a function of the synthesis conditions. The approach force vs. distance profiles are fitted using the Alexander‐de Gennes model to determine the grafting density, and the worm‐like chain model is used to estimate the chain length from the retract profiles. The grafting density for brushes synthesized within 80 nm pores is ten times lower than that obtained in 330 nm pores. For the same polymerization time, the chain lengths are much lower if the synthesis is carried out in small pores. The elastic properties of the brushes are also directly related to the confinement conditions.

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