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Self-assembly of poly(9,9 '-dihexylfluorene) to form highly ordered isoporous films via blending
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
Department of Physics, Norwegian University of Science and Technology (NTNU).
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2006 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 22, no 9, 3959-3961 p.Article in journal (Refereed) Published
Abstract [en]

Highly ordered hexagonal arrays of isoporous films prepared from poly(9,9'-dihexylfluorene) and polystyrene-grafted silica nanoparticles (Si-graft-PS) are presented. These close-packed arrays were formed in areas of many square millimeters. The pore size varied from 3.6 to 8.5 mu m, depending on the concentration of Si-graft-PS and the processing conditions. Solid-state photoluminescence resulted in a significant red shift of up to 30 nm in these films compared to that in conventional processing techniques. These differences are attributed to enhanced aggregation of the polymers caused by polymer-solvent interactions. These highly ordered polymer films may find use in microelectronic and biological and/or chemical sensor applications.

Place, publisher, year, edition, pages
2006. Vol. 22, no 9, 3959-3961 p.
Keyword [en]
Biosensors, Blending, Chemical sensors, Grafting (chemical), Nanostructured materials, Photoluminescence, Polystyrenes, Self assembly, Silica, Polymer films, Polymer-solvent interactions
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-8373DOI: 10.1021/la053025qISI: 000236989300003Scopus ID: 2-s2.0-33646442760OAI: oai:DiVA.org:kth-8373DiVA: diva2:13677
Note
QC 20100901Available from: 2008-05-08 Created: 2008-05-08 Last updated: 2017-12-14Bibliographically approved
In thesis
1. From Responsive Interfaces to Honeycomb Membranes by Controlled Radical Polymerisation
Open this publication in new window or tab >>From Responsive Interfaces to Honeycomb Membranes by Controlled Radical Polymerisation
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
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.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 67 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:37
Keyword
Isoporous membranes, Silica nanoparticles, ATRP, Functional surfaces, cellulose
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-4733 (URN)978-91-7178-982-2 (ISBN)
Public defence
2008-05-29, F3, Lindstedtväg 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100901Available from: 2008-05-08 Created: 2008-05-08 Last updated: 2010-09-01Bibliographically approved

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