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Superhydrophobic and self-cleaning bio-fiber surfaces via ATRP and subsequent postfunctionalization
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
2009 (engelsk)Inngår i: ACS applied materials & interfaces, ISSN 1944-8244, Vol. 1, nr 4, s. 816-823Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Superhydrophobic and self-cleaning cellulose surfaces have been obtained via surface-confined grafting of glycidyl methacrylate using atom transfer radical polymerization combined with postmodification reactions. Both linear and branched graft-on-graft architectures were used for the postmodification reactions to obtain highly hydrophobic bio-fiber surfaces by functionalization of the grafts with either poly(dimethylsiloxane), perfluorinated chains, or alkyl chains, respectively, Postfunctionalization using alkyl chains yielded results similar to those of surfaces modified by perfluorination, in terms of superhydrophobicity, self-cleaning properties, and the stability of these properties over time. in addition, highly oleophobic surfaces have been obtained when modification with perfluorinated chains was performed.

sted, utgiver, år, opplag, sider
2009. Vol. 1, nr 4, s. 816-823
Emneord [en]
biomaterial; biopolymer; epoxide; glycidyl methacrylate; methacrylic acid derivative; article; chemistry; crystallization; materials testing; methodology; surface property; Biocompatible Materials; Biopolymers; Crystallization; Epoxy Compounds; Materials Testing; Methacrylates; Surface Properties
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-6956DOI: 10.1021/am800235eISI: 000267536100012PubMedID: 20356007Scopus ID: 2-s2.0-73249117937OAI: oai:DiVA.org:kth-6956DiVA, id: diva2:11813
Merknad
QC 20100805. Uppdaterad från Submitted till Published 20100805.Tilgjengelig fra: 2007-04-10 Laget: 2007-04-10 Sist oppdatert: 2012-03-20bibliografisk kontrollert
Inngår i avhandling
1. Tailoring Surface Properties of Bio-Fibers via Atom Transfer Radical Polymerization
Åpne denne publikasjonen i ny fane eller vindu >>Tailoring Surface Properties of Bio-Fibers via Atom Transfer Radical Polymerization
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The potential use of renewable, bio-based polymers in high-technological applications has attracted great interest due to increased environmental concern. Cellulose is the most abundant biopolymer resource in the world, and it has great potential to be modified to suit new application areas. The development of controlled polymerization techniques, such as atom transfer radical polymerization (ATRP), has made it possible to graft well-defined polymers from cellulose surfaces. In this study, graft-modification of cellulose substrates by ATRP was explored as a tool for tailoring surface properties and for the fabrication of functional cellulose surfaces.

Various native and regenerated cellulose substrates were successfully graft-modified to investigate the effect of surface morphology on the grafting reactions. It was found that significantly denser polymer brushes were grafted from the native than from the regenerated cellulose substrates, most likely due to differences in surface area.

A method for detaching the grafted polymer from the substrate was developed, based on the selective cleavage of silyl ether bonds with tetrabutylammonium fluoride. The results from the performed kinetic study suggest that the surface-initiated polymerization of methyl methacrylate from cellulose proceeds faster than the concurrent solution polymerization at low monomer conversions, but slows down to match the kinetics of the solution polymerization at higher conversions.

Superhydrophobic and self-cleaning bio-fiber surfaces were obtained by grafting of glycidyl methacrylate using a branched graft-on-graft architecture, followed by post-functionalization to obtain fluorinated polymer brushes. AFM analysis showed that the surface had a micro-nano-binary structure. It was also found that superhydrophobic surfaces could be achieved by post-functionalization with an alkyl chain, with no use of fluorine.

Thermo-responsive cellulose surfaces have been prepared by graft-modification with the stimuli responsive polymer poly(N-isopropylacrylamide) (PNIPAAm). Brushes of poly(4-vinylpyridine) (P4VP) rendered a pH-responsive cellulose surface. Dual-responsive cellulose surfaces were achieved by grafting block-copolymers of PNIPAAm and P4VP.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2007. s. 56
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2007:16
Emneord
cellulose, bio-fiber, atom transfer radical polymerization, surface modification, grafting, polymer brushes, functional surfaces, superhydrophobic, stimuli-responsive
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4325 (URN)978-91-7178-616-6 (ISBN)
Disputas
2007-04-20, D3, Lindstedtsvägen 5, Stockholm, 10:00
Opponent
Veileder
Merknad
QC 20100804Tilgjengelig fra: 2007-04-10 Laget: 2007-04-10 Sist oppdatert: 2010-08-05bibliografisk kontrollert

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