• Treffer 22 von 25
Zurück zur Trefferliste

Dielectric investigations of the high performance polymer PIM-1 and nanocomposites containing phenethylPOSS

  • Especially now, in times of the energy revolution, the need for energy efficient separation processes promote the advancement of new high performance materials for use as highly selective separation membranes. Most promising materials in this field, especially for gas separation, are polymers with intrinsic microporosity (PIMs) which were firstly introduced by Budd and McKeown. Currently widespread application of PIMs for membrane technology is still restrained by their strong tendency to physical aging involving a significant loss of their good gas separation properties. This phenomenom is directly related to the molecular mobility. Here for the first time, molecular dynamics and conductivity in PIM-1, the first synthesized PIM, were investigated by broadband dielectric spectroscopy (BDS). Although an α-relaxation was not observed for PIM-1, as a thermal glass transition temperature has not yet previously been reported below its decomposition temperature at 370°C, surprisingly aEspecially now, in times of the energy revolution, the need for energy efficient separation processes promote the advancement of new high performance materials for use as highly selective separation membranes. Most promising materials in this field, especially for gas separation, are polymers with intrinsic microporosity (PIMs) which were firstly introduced by Budd and McKeown. Currently widespread application of PIMs for membrane technology is still restrained by their strong tendency to physical aging involving a significant loss of their good gas separation properties. This phenomenom is directly related to the molecular mobility. Here for the first time, molecular dynamics and conductivity in PIM-1, the first synthesized PIM, were investigated by broadband dielectric spectroscopy (BDS). Although an α-relaxation was not observed for PIM-1, as a thermal glass transition temperature has not yet previously been reported below its decomposition temperature at 370°C, surprisingly a conductivity contribution was found which is attributed to intermolecular agglomerates formed by π−π-stacking. Besides the studies on pure PIM-1 a polyhedral oligomeric phenethyl-silsesquioxanes (PhenethylPOSS) was used as nanofiller (0 – 40 wt%) in order to evaluate its ability to improve gas transport properties and probably control physical aging. The molecular mobility of all materials was analyzed by BDS of solution-cast films.zeige mehrzeige weniger

Volltext Dateien herunterladen

  • BDS2016_N.Konnertz.pdf
    eng

Metadaten exportieren

Weitere Dienste

Teilen auf Twitter Suche bei Google Scholar Anzahl der Zugriffe auf dieses Dokument
Metadaten
Autor*innen:Nora Konnertz
Koautor*innen:Martin Böhning, Andreas Schönhals
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2016
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Broadband dielectric spectroscopy; PIM-1; POSS
Veranstaltung:9th International Conference on Broadband Dielectric Spectroscopy and its Applications
Veranstaltungsort:Pisa, Italy
Beginndatum der Veranstaltung:11.09.2016
Enddatum der Veranstaltung:16.09.2016
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:10.10.2016
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
Einverstanden
Diese Webseite verwendet technisch erforderliche Session-Cookies. Durch die weitere Nutzung der Webseite stimmen Sie diesem zu. Unsere Datenschutzerklärung finden Sie hier.