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Radical initiator modified cerium oxide nanoparticles for polymer encapsulation via grafting from the surface
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. SP Technical Research Institute of Sweden.
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2014 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, no 106, 61863-61868 p.Article in journal (Refereed) Published
Abstract [en]

The present paper describes a versatile route to modify and stabilize ceria nanoparticles with a radical initiator, 4,4'-azobis(4-cyanovaleric acid) (ACVA), allowing a strong interface to be formed via grafting of polymers from the surface. This leads to the successful encapsulation of cerium oxide nanoparticles in a poly(methyl methacrylate) matrix. The interaction between the radical initiator and the surface of ceria is studied by FTIR spectroscopy where a consistent shift of the carboxylate band unequivocally demonstrates that the carboxylate groups of this acidic initiator complex the cerium ions on the ceria surface by means of strong and stable ionic bonding.

Place, publisher, year, edition, pages
2014. Vol. 4, no 106, 61863-61868 p.
Keyword [en]
Hybrid Latexes, Corrosion, Agents
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-158313DOI: 10.1039/c4ra09044fISI: 000345656600084Scopus ID: 2-s2.0-84912055127OAI: oai:DiVA.org:kth-158313DiVA: diva2:776162
Funder
EU, FP7, Seventh Framework Programme, 246434
Note

QC 20150107

Available from: 2015-01-07 Created: 2015-01-07 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Ceria Nanoparticle Hybrid Materials: Interfacial Design and Structure Control
Open this publication in new window or tab >>Ceria Nanoparticle Hybrid Materials: Interfacial Design and Structure Control
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This doctoral thesis addresses the challenge of bringing two very different materials into intimate chemical contact: inorganic metal oxide nanoparticles and acrylic polymers. In order to achieve this ambitious goal, the work has been divided into a series of more accessible tasks. Pedagogically designed, these tasks build upon one another to finally develop the knowledge and skills necessary to successfully formulate novel nanocomposites.

A fundamental study on the bulk and surface bonding of ceria was carried out to show that, due to the ceria content in small and highly charged ions, which are difficult to polarize, the preferred chemical interactions are ionic. Among the different capping agents, the carboxylate ligands —through the rich and localized electron density of their oxygen atoms— formed an ionic bond with cerium oxides. This provided stability to the ceria nanoparticles and opened up a vast robust and versatile library of carboxylates to us. This is exemplified by the development of synthetic routes for understanding and modifying ceria nanoparticles with carboxylic acids carrying reactive moieties, which were used to extend the stability of the nanoparticle dispersions. This allowed us to perform in situ polymerization, which resulted in homogeneous ceria–polymer hybrid nanocomposites. This interfacial design offers not only structure control but also strong bonding between the covalent polymer network and the ionic nanocrystals.

The focus of the present work, however, is not on characterization of the polymeric materials used but rather on how the embedded nanoparticles interact with the polymeric matrix with respect to chemical interfacial aspects. The following cases were studied: i) unreactive nanoceria dispersed in a polymer matrix; ii) dispersed nanoceria endowed with the ability to initiate polymerizations; and iii) dispersed nanoceria capable of copolymerizing with the propagating chains of the polymer.

These processes led to the development of novel hybrid nanocomposites that preserved the optical properties of ceria (e.g. UV absorption) while enhancing mechanical properties such as stiffness and glass transition temperature.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. xviii, 124 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:46
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-173367 (URN)978-91-7595-674-9 (ISBN)
Public defence
2015-09-18, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20150910

Available from: 2015-09-10 Created: 2015-09-10 Last updated: 2015-09-10Bibliographically approved

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Johansson, Mats

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