Dissertation:
Micrometer and Sub-Micrometer Structure Formation of Phase Separating Polymer Films

No Thumbnail Available
Date
2000
Editors
Walheim, Stefan
relationships.isEditorOf
Contact
Journal ISSN
Electronic ISSN
ISBN
Bibliographical data
Publisher
Series
DOI (citable link)
ArXiv-ID
International patent number
Link to the license
Project
EU project number
Open Access publication
Collections
Restricted until
Title in another language
Mikrometer- und Submikrometer-Strukturierung phasenseparierender Polymerfilme
Research Projects
Organizational Units
Journal Issue
Publication type
Dissertation
Publication status
Abstract
Dissolving two incompatible polymers in a common solvent and spin-coating the solution leads to phase separation during the evaporation of the solvent. Spinodal decomposition is the underlying process. In the thin film geometry, surface directed spinodal decomposition and also wetting properties of the different phases play an important role during the structure formation process. Thus, the phase morphology can be organized normal or parallel to the film surface depending on the surface energy of the substrate. We make use of the substrate sensitivity of the demixing process. By using chemically heterogeneous pre-structured substrates made by micro-contact printing an arbitrary substrate pattern can be used to induce a lateral composition variation in the polymer film. Thus, by controlling the phase morphology, one can create surfaces with new properties, e.g. lithography masks, optical devices, or biological sensors. For instance this novel structuring technique can be applied to ion conducting organic-inorganic hybrid materials and polymer-metal precursors for high Tc superconductors. More complex morphologies are found after spin-casting ternary polymer blends. If one of the polymer-polymer interaction parameters exceeds the sum of the other two, the morphologies can be considered as two-dimensional emulsions. Simulation results performed by Nauman et al. closely resemble the morphologies observed in our study.
Laterally isotropic phase separated polymer films can feature new physical properties. For example if one of the two polymers of a phase morphology with a lateral length scale below 200 nm is removed, the resulting nano-porous film can be used as a high-performance anti-reflection coating. The refractive index of these films can be adjusted in a range from 1.6 down to 1.05 by varying the polymer composition of the solution. This allows the build up of multi-layer AR-coatings with a broad spectral transmission.
Summary in another language
Diese Arbeit beschreibt die Strukturbildung im Mikrometer- und Sub-Mikrometer-Bereich in duennen Polymerfilmen. Werden zwei inkompatible Polymere in einem gemeinsamen Loesungsmittel geloest und mit einer Lackschleuder (spin-coater) ein duenner Film aus dieser Loesung hergestellt, so fuehrt dies zur Phasenseparation der beiden Polymerkomponenten waehrend des Verdampfens des Loesungsmittels. In der eingeschraenkten Geometrie eines duennen Films spielt oberflaecheninduzierte spinodale Entmischung, aber auch das Benetzungsverhalten der einzelnen Polymerphasen eine wichtige Rolle fuer den Strukturbildungsprozess. Durch die Verwendung von heterogen vorstrukturierten Substraten, hergestellt durch Mikrokontaktstempeln (µCP), koennen beliebige Muster in eine laterale Kompositionsvariation im Polymerfilm uebertragen werden. Dabei wird das mit µCP erzeugte Muster, das aus einer etwa 2 nm dicken molekularen Monolage besteht, in einen etwa 100 nm dicken Polymerfilm uebertragen, der sich innerhalb weniger Sekunden waehrend des spin-coating-Prozesses bildet. Durch diese kontrollierte Phasenseparation koennen Oberflaechen mit neuen Eigenschaften entstehen, deren Anwendung in der Lithographie, der Optik oder im Bereich der Biosensorik zu suchen sind. Zum Beispiel kann diese neue Methode angewendet werden, um ionenleitende organisch -anorganische Hybridmaterialien und Precursor von keramischen hoch-Tc Supraleitern zu strukturieren.
Aber auch lateral isotrope Phasenseparation kann zu Filmen mit neuen physikalischen Eigenschaften fuehren. Wird beispielsweise eine Polymerkomponente aus einem Film mit einer Morphologie auf der Laengenskala unterhalb 200 nm heraus geloest, erhaelt man einen nanoporoesen Film, der als hochwertige Antireflexschicht dienen kann. Dabei kann der Brechungsindex dieser Filme durch Wahl der Polymerzusammensetzung im Bereich von 1,6 -1,05 frei eingestellt werden. Dies ermoeglicht den Aufbau von Multischichtsystemen mit unerreicht breitbandiger Transmission.
Subject (DDC)
530 Physics
Keywords
Antireflexschicht , Phasenseparation , Precursor fuer Hochtemperatursupraleiter , Ionenleiter organisch-anorganiches Hybridmaterial , Polymerlösung , spin-coating , micro-contact printing , nanoporous material , anti-reflection coating , pattern recognition
Published in
Conference
Review
undefined / . - undefined, undefined. - (undefined; undefined)
Cite This
ISO 690WALHEIM, Stefan, 2000. Micrometer and Sub-Micrometer Structure Formation of Phase Separating Polymer Films [Dissertation]. Konstanz: University of Konstanz
BibTex
@phdthesis{Walheim2000Micro-8880,
  year={2000},
  title={Micrometer and Sub-Micrometer Structure Formation of Phase Separating Polymer Films},
  author={Walheim, Stefan},
  address={Konstanz},
  school={Universität Konstanz}
}
RDF
<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/8880">
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/8880"/>
    <dc:language>eng</dc:language>
    <dcterms:rights rdf:resource="https://rightsstatements.org/page/InC/1.0/"/>
    <dcterms:alternative>Mikrometer- und Submikrometer-Strukturierung phasenseparierender Polymerfilme</dcterms:alternative>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:51:18Z</dcterms:available>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/8880/1/SWalheimDiss.pdf"/>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dc:creator>Walheim, Stefan</dc:creator>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dc:contributor>Walheim, Stefan</dc:contributor>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:51:18Z</dc:date>
    <dcterms:title>Micrometer and Sub-Micrometer Structure Formation of Phase Separating Polymer Films</dcterms:title>
    <dc:rights>terms-of-use</dc:rights>
    <dcterms:issued>2000</dcterms:issued>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/8880/1/SWalheimDiss.pdf"/>
    <dcterms:abstract xml:lang="eng">Dissolving two incompatible polymers in a common solvent and spin-coating the solution leads to phase separation during the evaporation of the solvent. Spinodal decomposition is the underlying process. In the thin film geometry, surface directed spinodal decomposition and also wetting properties of the different phases play an important role during the structure formation process. Thus, the phase morphology can be organized normal or parallel to the film surface depending on the surface energy of the substrate. We make use of the substrate sensitivity of the demixing process. By using chemically heterogeneous pre-structured substrates made by micro-contact printing an arbitrary substrate pattern can be used to induce a lateral composition variation in the polymer film. Thus, by controlling the phase morphology, one can create surfaces with new properties, e.g. lithography masks, optical devices, or biological sensors. For instance this novel structuring technique can be applied to ion conducting organic-inorganic hybrid materials and polymer-metal precursors for high Tc superconductors. More complex  morphologies are found after spin-casting ternary polymer blends. If one of the polymer-polymer interaction parameters exceeds the sum of the other two, the morphologies can be considered as two-dimensional emulsions. Simulation results performed by Nauman et al. closely resemble the morphologies observed in our study.&lt;br /&gt;Laterally isotropic phase separated polymer films can feature new physical properties. For example if one of the two polymers of a phase morphology with a lateral length scale below 200 nm is removed, the resulting nano-porous film can be used as a high-performance anti-reflection coating. The refractive index of these films can be adjusted in a range from 1.6 down to 1.05 by varying the polymer composition of the solution. This allows the build up of multi-layer AR-coatings with a broad spectral transmission.</dcterms:abstract>
    <dc:format>application/pdf</dc:format>
  </rdf:Description>
</rdf:RDF>
Internal note
xmlui.Submission.submit.DescribeStep.inputForms.label.kops_note_fromSubmitter
Contact
URL of original publication
Test date of URL
Examination date of dissertation
May 31, 2000
Method of financing
Comment on publication
Alliance license
Corresponding Authors der Uni Konstanz vorhanden
International Co-Authors
Bibliography of Konstanz
Refereed
Link to research data
Description of supplementary data