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Beyond state of the art honeycomb membranes: High performance ordered arrays from multi-programmable linear-dendritic block copolymers
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating 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.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
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2015 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 25, no 30Article in journal (Refereed) Published
Abstract [en]

A new generation of honeycomb membranes is herein described from a novel library of multipurpose linear-dendritic block copolymers. These are accomplished by combining atom transfer radical polymerization together with dendrimer chemistry and click reactions. The resulted amorphous block copolymers, with T-g between 30 and 40 degrees C, display three important functions, i.e., pore generating aromatic groups, crosslinking azides, and multiple dendritic functional groups. All block copolymers enable the successful fabrication of honeycomb membranes through the facile breath figure method. The peripheral dendritic functionality is found to influence the porous morphologies from closed pored structure with pore size of 1.12 mu m(2) to open pore structure with pore size 10.26 mu m(2). Facile UV crosslinking of the azides yields membranes with highly durable structural integrity. Upon crosslinking, the pH and thermal stability are extended beyond the noncrosslinked membranes in which the porous integrity is maintained up to 400 degrees C and pH 1-14. Taking into account the straightforward and cost-efficient strategy to generate ordered, functional, and structurally stable honeycomb membranes on various solid substrates, it is apparent that these multipurpose block copolymers may unlock future applications including use as molds for soft lithography.

Place, publisher, year, edition, pages
2015. Vol. 25, no 30
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-166861DOI: 10.1002/adfm.201501643ISI: 000359381300010Scopus ID: 2-s2.0-84938973586OAI: oai:DiVA.org:kth-166861DiVA, id: diva2:812799
Note

Updated from manuscript to article.

QC 20150909

Available from: 2015-05-20 Created: 2015-05-20 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Advanced Functional Thin Films and Networks towards Biological Applications
Open this publication in new window or tab >>Advanced Functional Thin Films and Networks towards Biological Applications
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Functional polymeric scaffolds have been employed in biological applications as several utilities, from nano-sized drug delivery systems to concrete implants. The progression in biological fields essentially relies on finding an appropriate material to fulfil the critical requirements for various types of applications with great potential for tuning functionality and mechanical properties. Therefore, the generation of new materials in extensive libraries is desirable for researchers. In this thesis, two main varieties of functional scaffolds have been constructed; these include i) periodic structure isoporous membranes and ii) three dimension (3D) crosslinked networks with programmable functionalities and mechanical properties. In the first case, a library of linear dendritic (LD) block copolymers was synthesised from biocompatible 2,2-bis(methylol)propionic acid (bis-MPA) dendrons and 2- hydroxyethyl methacrylate (HEMA) derivatives. These materials were successfully employed for the fabrication of isoporous membranes via the facile Breath Figure (BF) method. The dendritic periphery end groups control the manipulation of film morphology, as well as introduction of desired functionalities, either pre- or post- film formation. The introduction of azide functional group along the polymer backbone allows crosslinking reaction, which enhances the stability of the isoporous films. The stability towards temperature was improved from around its glass transition temperature (Tg) to 400 °C after crosslinking; simultaneously the porosity is maintained after immersion in the whole range of pH (1-14). These materials show great potential use as high performance isoporous membranes in futuristic applications such as micro-reactors, sensors and cell patterning platforms. In the second case, the facile fabrication of functional networks employs off-stoichiometric crosslinking, which resulted in residual reactive functional groups after film formation and networks with different crosslinking density. This straightforward off-stoichiometric concept is applied with commercially available materials and well-controlled dendritic-linear-dendritic (DLD) hybrid polymers, generating functional networks with different properties from high stiffness film to soft hydrogels. The network post-modification can be performed topologically and throughout the scaffold. Several crosslinking chemistries were employed for construction of hydrogels from DLD hybrid polymers. The Copper(I) Catalysed Azide-Alkyne Cycloaddition (CuAAC) click reaction results in hydrogels with higher compressive modulus compared to other hydrogels constructed from thiol-ene, thiol-yne and amine-N-hydroxysuccinimide (NHS) esters coupling methods with similar building blocks. These functional crosslinked networks are suitable for numerous applications including fabrication of microfluidic devices, cell culture platforms and bone adhesives.

 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. p. 72
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:23
National Category
Polymer Chemistry
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-166600 (URN)978-91-7595-552-0 (ISBN)
Public defence
2015-06-05, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
VINNOVA
Note

QC 20150520

Available from: 2015-05-20 Created: 2015-05-12 Last updated: 2015-05-20Bibliographically approved

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