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Preparation and properties of inverse nanoparticle-polymer composites / Ron Hoffmann-Sebold.
- Format:
- Book
- Author/Creator:
- Hoffmann-Sebold, Ron, author.
- Language:
- English
- Subjects (All):
- Chemistry.
- Physical Description:
- 1 online resource (247 pages)
- Edition:
- 1st ed.
- Place of Publication:
- Göttingen, Germany : Cuvillier Verlag, [2023]
- Summary:
- Die Dissertation legt die Überwindung der Nachteile von niedrig gefüllten Nanopartikel-Polymer-Kompositen durch die anfängliche Herstellung eines stabilen, perkolierenden anorganischen Nanopartikelgerüsts dar. Dessen sehr hohe Porosität wird entweder aus der Gasphase mittels Flammensprühpyrolyse (FSP) oder alternativ über nasschemische Präparation mittels Sol-Gel-Verfahren erreicht. Im Anschluss werden die perkolierenden Strukturen mittels kapillargetriebener Infiltration mit einem Monomer gefüllt, welches daraufhin photochemisch polymerisiert wird. Das erhaltene System wird inverses Nanopartikel-Polymer-Komposit genannt. Dünne Schichten daraus können beispielweise für haftvermittelnde, elektrische sowie optoelektronische Funktionsmaterialien eingesetzt werden. Die ursprüngliche Partikelnetzwerk- und Porenstruktur bleibt während der Präparation erhalten und durch die Infiltration sowie anschließende Monomer-Polymerisation konnte die elektrische Leitfähigkeit von Halbleiternanopartikeln deutlich gesteigert werden. Für den Reaktionsmechanismus innerhalb der mesoskaligen Porenstruktur wurde ein analytisches Kinetikmodell der freien radikalischen Photopolymerisation unter Einschluss entwickelt und mit diffuser Reflexions-FTIR-Spektroskopie (DRIFTS) bestätigt.This dissertation presents how the drawbacks of low-filled nanoparticle-polymer composites can be overcome by initially preparing a stable percolating inorganic nanoparticle framework, in which very high porosity is achieved, either from the gas phase by flame spray pyrolysis (FSP) or, alternatively, via wet chemical preparation using a sol-gel process. Subsequently, the percolating structures are filled with a monomer by capillary-driven infiltration, which is then photochemically polymerized. The obtained system is called inverse nanoparticle-polymer composite. Thin-film layers from the composite can be applied, for example, as adhesion-promoting, electrical or optoelectronic functional materials. The original particle network and pore structure is preserved during the preparation, and the electrical conductivity of semiconducting nanoparticles could be significantly increased by infiltration, as well as subsequent monomer polymerization. An analytical model of the reaction kinetics was developed for free radical photopolymerization under spatial confinement within the mesoscale pore structure and confirmed by diffuse reflectance FTIR spectroscopy (DRIFTS).
- Contents:
- Intro
- 1 Introduction
- 1.1 Motivation
- 1.2 Scientific Question
- 2 Theoretical Background
- 2.1 Porosity and Percolation
- 2.2 Silane Coupling Agents for Composites
- 2.3 Free Radical Polymerization of Acrylates
- 2.4 Cationic Polymerization of Epoxides
- 2.5 Infrared and Raman Spectroscopy of Thin Films
- 3 Results and Discussion
- 3.1 Preparation of Highly Porous Nanoparticle Layers
- 3.2 Imbibition of Liquids and Polymerization in Mesoporous Scaffolds
- 3.3 Inversely Prepared Conducting Nanoparticle-Composites
- 4 Conclusions and Perspective
- 4.1 Conclusions
- 4.2 Further Prospects
- 5 References
- 6 Underlying Publications
- 6.1 Publication 1
- 6.2 Publication 2
- 6.3 Publication 3
- 7 Appendix.
- Notes:
- Description based on print version record.
- Includes bibliographical references.
- Other Format:
- Print version: Hoffmann-Sebold, Ron Preparation and Properties of Inverse Nanoparticle-Polymer Composites
- ISBN:
- 9783736967427
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