Mechanistic study of hydrothermal synthesis of aromatic polyimides

Unterlass, Miriam M.; Kopetzki, Daniel; Antonietti, Markus; Weber, Jens

Mechanistic study of hydrothermal synthesis of aromatic polyimides

Dateien

Unterlass_2-h0erzjn9hdvl1.pdfGröße: 1.59 MBDownloads: 1

Datum

2011

Autor:innen

Unterlass, Miriam M.

Kopetzki, Daniel

Antonietti, Markus

Weber, Jens

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Polymer Chemistry. Royal Society of Chemistry (RSC). 2011, 2(8), pp. 1744-1753. ISSN 1759-9954. eISSN 1759-9962. Available under: doi: 10.1039/c1py00109d

Zusammenfassung

A mechanistic study regarding the synthesis of aromatic polyimides (PIs) under hydrothermal conditions is presented. We demonstrate evidence that the first step of the reaction is the formation of a nylon type salt, which can be isolated. Upon heating the salt in the presence of water at 180 °C, polyimides are formed from the salts. Additionally performed DFT calculations substantiate the experimental findings and give evidence that the formation of imides is energetically favorable in hot water. The intermediate salts as well as the resulting PIs are characterized by diverse analytical techniques (SEC, FT-IR, WAXS, SEM). By selective fractionation, it is possible to obtain polyimides of moderate to high molecular weights that form tough films. The polymerization mechanism is discussed, and it is shown that different loci of reaction are possible, namely interfacial polycondensation, heterophase polymerization and topochemical transformations, which seem to occur in parallel. Finally, poloxamers can be used as additives for the fine-tuning of the polymer morphology.

Fachgebiet (DDC)

540 Chemie

Zitieren

ISO 690

UNTERLASS, Miriam M., Daniel KOPETZKI, Markus ANTONIETTI, Jens WEBER, 2011. Mechanistic study of hydrothermal synthesis of aromatic polyimides. In: Polymer Chemistry. Royal Society of Chemistry (RSC). 2011, 2(8), pp. 1744-1753. ISSN 1759-9954. eISSN 1759-9962. Available under: doi: 10.1039/c1py00109d

BibTex

@article{Unterlass2011Mecha-54834,
  year={2011},
  doi={10.1039/c1py00109d},
  title={Mechanistic study of hydrothermal synthesis of aromatic polyimides},
  number={8},
  volume={2},
  issn={1759-9954},
  journal={Polymer Chemistry},
  pages={1744--1753},
  author={Unterlass, Miriam M. and Kopetzki, Daniel and Antonietti, Markus and Weber, Jens}
}

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/123456789/54834">
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <dc:contributor>Unterlass, Miriam M.</dc:contributor>
    <dc:contributor>Kopetzki, Daniel</dc:contributor>
    <dc:contributor>Weber, Jens</dc:contributor>
    <dc:language>eng</dc:language>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dcterms:rights rdf:resource="https://rightsstatements.org/page/InC/1.0/"/>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <dc:creator>Kopetzki, Daniel</dc:creator>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/54834/1/Unterlass_2-h0erzjn9hdvl1.pdf"/>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2021-09-08T12:55:39Z</dc:date>
    <dc:rights>terms-of-use</dc:rights>
    <dc:creator>Weber, Jens</dc:creator>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2021-09-08T12:55:39Z</dcterms:available>
    <dcterms:title>Mechanistic study of hydrothermal synthesis of aromatic polyimides</dcterms:title>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/54834/1/Unterlass_2-h0erzjn9hdvl1.pdf"/>
    <dcterms:abstract xml:lang="eng">A mechanistic study regarding the synthesis of aromatic polyimides (PIs) under hydrothermal conditions is presented. We demonstrate evidence that the first step of the reaction is the formation of a nylon type salt, which can be isolated. Upon heating the salt in the presence of water at 180 °C, polyimides are formed from the salts. Additionally performed DFT calculations substantiate the experimental findings and give evidence that the formation of imides is energetically favorable in hot water. The intermediate salts as well as the resulting PIs are characterized by diverse analytical techniques (SEC, FT-IR, WAXS, SEM). By selective fractionation, it is possible to obtain polyimides of moderate to high molecular weights that form tough films. The polymerization mechanism is discussed, and it is shown that different loci of reaction are possible, namely interfacial polycondensation, heterophase polymerization and topochemical transformations, which seem to occur in parallel. Finally, poloxamers can be used as additives for the fine-tuning of the polymer morphology.</dcterms:abstract>
    <dcterms:issued>2011</dcterms:issued>
    <dc:creator>Antonietti, Markus</dc:creator>
    <dc:creator>Unterlass, Miriam M.</dc:creator>
    <dc:contributor>Antonietti, Markus</dc:contributor>
    <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/54834"/>
  </rdf:Description>
</rdf:RDF>

Universitätsbibliographie

Nein

Begutachtet

Ja