Catalysts and Process Design for Living Aqueous Polymerization to Ultra High Molecular Weight Polyethylene Nanocrystals

Schnitte, Manuel

Catalysts and Process Design for Living Aqueous Polymerization to Ultra High Molecular Weight Polyethylene Nanocrystals

Dateien

Schnitte_2-1uc6lswlmuvr02.pdfGröße: 20.48 MBDownloads: 291

Datum

2021

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Chemie

Publikationstyp

Dissertation

Publikationsstatus

Published

Zusammenfassung

Assembly of anisotropic shape nanoparticles holds potential to form superstructures and materials with yet unmet properties. However, routes to anisotropic polymer particle dispersions of high solids content are lacking. Polyethylene, an important synthetic material, can be obtained in the unusual form of nanoscale platelet-like single crystals by aqueous catalytic polymerization with Ni(II) salicylaldiminato catalysts. Generation of such nanocrystals with uniform shapes and sizes is highly desirable, considering formation of materials with well-defined properties by their assembly. Indeed, this would require a strictly living chain growth and, simultaneously, a living particle growth in absence of any termination reactions.
This work reports the concept of such a living catalytic polymerization of ethylene in aqueous surfactant solution, resulting in particles grown by a single active site and composed of a single ultra high molecular weight polyethylene (UHMWPE) chain. These findings are a relevant step towards polymer materials based on nanoparticle assembly.

Fachgebiet (DDC)

540 Chemie

Zitieren

ISO 690

SCHNITTE, Manuel, 2021. Catalysts and Process Design for Living Aqueous Polymerization to Ultra High Molecular Weight Polyethylene Nanocrystals [Dissertation]. Konstanz: University of Konstanz

BibTex

@phdthesis{Schnitte2021Catal-53179,
  year={2021},
  title={Catalysts and Process Design for Living Aqueous Polymerization to Ultra High Molecular Weight Polyethylene Nanocrystals},
  author={Schnitte, Manuel},
  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/123456789/53179">
    <dcterms:abstract xml:lang="eng">Assembly of anisotropic shape nanoparticles holds potential to form superstructures and materials with yet unmet properties. However, routes to anisotropic polymer particle dispersions of high solids content are lacking. Polyethylene, an important synthetic material, can be obtained in the unusual form of nanoscale platelet-like single crystals by aqueous catalytic polymerization with Ni(II) salicylaldiminato catalysts. Generation of such nanocrystals with uniform shapes and sizes is highly desirable, considering formation of materials with well-defined properties by their assembly. Indeed, this would require a strictly living chain growth and, simultaneously, a living particle growth in absence of any termination reactions.&lt;br /&gt;This work reports the concept of such a living catalytic polymerization of ethylene in aqueous surfactant solution, resulting in particles grown by a single active site and composed of a single ultra high molecular weight polyethylene (UHMWPE) chain. These findings are a relevant step towards polymer materials based on nanoparticle assembly.</dcterms:abstract>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/53179/3/Schnitte_2-1uc6lswlmuvr02.pdf"/>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2021-03-18T06:50:16Z</dc:date>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/53179/3/Schnitte_2-1uc6lswlmuvr02.pdf"/>
    <dc:contributor>Schnitte, Manuel</dc:contributor>
    <dc:language>eng</dc:language>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dcterms:issued>2021</dcterms:issued>
    <dcterms:rights rdf:resource="https://rightsstatements.org/page/InC/1.0/"/>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2021-03-18T06:50:16Z</dcterms:available>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <dc:rights>terms-of-use</dc:rights>
    <dc:creator>Schnitte, Manuel</dc:creator>
    <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/53179"/>
    <dcterms:title>Catalysts and Process Design for Living Aqueous Polymerization to Ultra High Molecular Weight Polyethylene Nanocrystals</dcterms:title>
  </rdf:Description>
</rdf:RDF>

Prüfungsdatum der Dissertation

March 12, 2021

Hochschulschriftenvermerk

Konstanz, Univ., Diss., 2021

Universitätsbibliographie

Nein