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Thermoresponsive Pentablock Copolymer on Silica: Temperature Effects on Adsorption, Surface Forces, and Friction
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
CUNY City Coll, Dept Chem Engn, Grove Sch Engn, New York, NY 10031 USA..
Univ Montreal, Dept Chem, CP 6128 Succursale Ctr Ville, Montreal, PQ H3C 3J7, Canada..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. RISE Res Inst Sweden, Div Biosci & Mat, SE-11486 Stockholm, Sweden..ORCID iD: 0000-0002-2288-819X
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2019 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 35, no 3, p. 653-661Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 35, no 3, p. 653-661
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-244115DOI: 10.1021/acs.langmuir.8b03729ISI: 000456749400007PubMedID: 30605339OAI: oai:DiVA.org:kth-244115DiVA, id: diva2:1289751
Conference
AESSON PM, 1987, JOURNAL OF COLLOID AND INTERFACE SCIENCE, V117, P366 jas OJ, 2002, LANGMUIR, V18, P1604 ltermo A, 1996, JOURNAL OF COLLOID AND INTERFACE SCIENCE, V183, P506 trov P, 1997, LANGMUIR, V13, P3331 ein J, 2000, JOURNAL OF PHYSICS-CONDENSED MATTER4th Liquid Matter Conference, JUL 03-07, 1999, GRANADA, SPAIN, V12, PA19 unkett MA, 2003, LANGMUIR, V19, P4673 nquy Xavier, 2014, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, V136, P6199 ttersson Torbjorn, 2008, JOURNAL OF COLLOID AND INTERFACE SCIENCE, V324, P246 ndin Maria, 2008, LANGMUIR, V24, P3814
Funder
Swedish Research Council, 2015-05080
Note

QC 20190219

Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-02-19Bibliographically approved

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Dobryden, IlliaDédinaité, AndraClaesson, Per M.

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