Thermoresponsive Pentablock Copolymer on Silica : Temperature Effects on Adsorption, Surface Forces, and Friction

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Dobryden , I , Ruiz , M C , Zhang , X , Dedinaite , A , Wieland , D C F , Winnik , F M & Claesson , P M 2019 , ' Thermoresponsive Pentablock Copolymer on Silica : Temperature Effects on Adsorption, Surface Forces, and Friction ' , Langmuir , vol. 35 , no. 3 , pp. 653-661 . https://doi.org/10.1021/acs.langmuir.8b03729

Title: Thermoresponsive Pentablock Copolymer on Silica : Temperature Effects on Adsorption, Surface Forces, and Friction
Author: Dobryden, Illia; Ruiz, Maria Cortes; Zhang, Xuwei; Dedinaite, Andra; Wieland, D. C. Florian; Winnik, Francoise M.; Claesson, Per M.
Contributor: University of Helsinki, Department of Chemistry
Date: 2019-01-22
Language: eng
Number of pages: 9
Belongs to series: Langmuir
ISSN: 0743-7463
URI: http://hdl.handle.net/10138/301153
Abstract: The adsorption of hydrophilic or amphiphilic multiblock copolymers provides a powerful means to produce well-defined "smart" surfaces, especially if one or several blocks are sensitive to external stimuli. We focus here on an A-B-A-B-A copolymer, where A is a cationic poly((3acrylamido-propyl)-trimethylammonium chloride) (PAMPTMA) block containing 15 (end blocks) or 30 (middle block) repeat units and B is a neutral thermosensitive water-soluble poly(2-isopropyl-2-oxazoline) (PIPOZ) block with 50 repeat units. X-ray reflectivity and quartz crystal microbalance with dissipation monitoring were employed to study the adsorption of PAMPTMA(15)-PAMPTMA(30)-PIPOZ(50)-PAMPTMA(15) on silica surfaces. The latter technique was employed at different temperatures up to 50 degrees C. Surface forces and friction between the two silica surfaces across aqueous pentablock copolymer solutions at different temperatures were determined with the atomic force microscopy colloidal probe force and friction measurements. The cationic pentablock copolymer was found to have a high affinity to the negatively charged silica surface, leading to a thin (2 nm) and rigid adsorbed layer. A steric force was encountered at a separation of around 3 nm from hard wall contact. A capillary condensation of a polymer-rich phase was observed at the cloud point of the solution. The friction forces were evaluated using Amontons' rule modified with an adhesion term.
Subject: QUARTZ-CRYSTAL MICROBALANCE
CAPILLARY CONDENSATION
CHARGE-DENSITY
POLYMER
LAYERS
TERPOLYMER
CHITOSAN
LOOPS
116 Chemical sciences
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