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Intelligent Dual-Responsive Cellulose Surfaces via Surface-Initiated ATRP
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
Vise andre og tillknytning
2008 (engelsk)Inngår i: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 9, nr 8, s. 2139-2145Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Novel thermo-responsive cellulose (filter paper) surfaces of N-isopropylacrylamide (NIPAAm) and pH-responsive cellulose surfaces of 4-vinylpyridine (4VP) have been achieved via surface-initiated ATRP. Dual-responsive (pH and temperature) cellulose surfaces were also obtained through the synthesis of block-copolymer brushes of PNIPAAm and P4VP. With changes in pH and temperature, these "intelligent" surfaces showed a reversible response to both individual triggers, as indicated by the changes in wettability from highly hydrophilic to highly hydrophobic observed by water contact angle measurements. Adjusting the composition of the grafted block-copolymer brushes allowed for further tuning of the wettability of these "intelligent" cellulose surfaces.

sted, utgiver, år, opplag, sider
2008. Vol. 9, nr 8, s. 2139-2145
Emneord [en]
Acrylic monomers; Amides; Angle measurement; Atom transfer radical polymerization; Brushes; Cellulose; Contact angle; Copolymerization; Nanostructured materials; Plastic products; Polymers; 4-vinylpyridine; Block co polymers; Cellulose surfaces; Filter papers; N-Isopropylacrylamide; pH-responsive; PNIPAAm; Surface-initiated ATRP; Water contact angle; Acrylamides; Acrylic Resins; Biocompatible Materials; Cellulose; Copper; Filtration; Hydrogen-Ion Concentration; Hydrolysis; Polymers; Pyridines; Spectrophotometry, Infrared; Spectroscopy, Fourier Transform Infrared; Surface Properties; Temperature; Wettability
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-8371DOI: 10.1021/bm800193nISI: 000258400200008PubMedID: 18636775Scopus ID: 2-s2.0-52649118631OAI: oai:DiVA.org:kth-8371DiVA, id: diva2:13675
Merknad
QC 20100805. Uppdaterad från In press till Published 20100805.Tilgjengelig fra: 2008-05-08 Laget: 2008-05-08 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. From Responsive Interfaces to Honeycomb Membranes by Controlled Radical Polymerisation
Åpne denne publikasjonen i ny fane eller vindu >>From Responsive Interfaces to Honeycomb Membranes by Controlled Radical Polymerisation
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

In this study, surface modification of both organic and inorganic substrates (in terms of cellulose and silica nanoparticles, respectively) has been explored using surface-initiated atom transfer radical polymerisation (ATRP).

The desire to modify bio-based materials to fit into new application areas and the need for bio-based materials with improved material properties is steadily increasing due to environmental concern.

Superhydrophobic and self-cleaning cellulose surfaces were fabricated by combining ATRP with post-functionalisation. Glycidyl methacrylate was grafted from filter paper, and the epoxide groups were used as reactive handles to create a branched “graft-on-graft” architecture. Post-functionalisation of this architecture with perfluorinated chains or alkyl chains resulted in the formation of superhydrophobic surfaces.

Grafting of N-isopropylacrylamide (NIPAAm) from filter paper yielded cellulose surfaces capable of switching the wettability, from hydrophilic to hydrophobic, in response to changes in temperature. The wettability of cellulose surfaces grafted with poly(4-vinylpyridine) (P4VP) could be adjusted from hydrophilic to hydrophobic by changing pH. Furthermore, cellulose surfaces responding to changes in both pH and temperature were obtained via grafting of block copolymers of PNIPAAm and P4VP.

The use of inorganic nano-particles in composites has attracted considerable academic and industrial interest due to their excellent mechanical and thermal properties. Styrene was grafted from the surface of silica nanoparticles using ATRP. The resulting organic-inorganic hybrid materials did not aggregate to the same extent as the un-modified silica particles.

The polystyrene-modified silica particles were used for the fabrication of honeycomb membranes. It was evident that the pore sizes and the number of porous layers could be tuned by varying the conditions used for film casting. To broaden the range of polymers available for film casting into honeycomb membranes, a block copolymer of polystyrene and poly(methyl methacrylate) was grafted from silica nanoparticles. Polymer-blends of polystyrene-modified particles and poly(9,9´-dihexylfluorene) (PDHF) were also used as an alternative to incorporate functionality into honeycomb membranes.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2008. s. 67
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2008:37
Emneord
Isoporous membranes, Silica nanoparticles, ATRP, Functional surfaces, cellulose
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4733 (URN)978-91-7178-982-2 (ISBN)
Disputas
2008-05-29, F3, Lindstedtväg 26, Stockholm, 10:00
Opponent
Veileder
Merknad
QC 20100901Tilgjengelig fra: 2008-05-08 Laget: 2008-05-08 Sist oppdatert: 2010-09-01bibliografisk kontrollert

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