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Titel: Monitoring morphology and properties of hybrid organic-inorganic materials from in situ polymerization of tetraethoxysilane in polyimide polymer : 1. effect of the coupling agent on the microstructure and interfacial interaction
Verfasser: Kaddami, Hamid
Becker-Willinger, Carsten
Schmidt, Helmut K.
Sprache: Englisch
Erscheinungsjahr: 2006
Quelle: e-Polymers. - 2006, 10 [Elektronische Ressource]
SWD-Schlagwörter: Organisch-anorganischer Hybridwerkstoff
In situ
DDC-Sachgruppe: 620 Ingenieurwissenschaften und Maschinenbau
Dokumentart : Journalartikel
Kurzfassung: Transmission electron microscopy (TEM), small angle X-ray (SAXS) and dynamical mechanical thermal analysis (DMTA) were used to characterize the morphology and thermo-mechanical properties of hybrid organic inorganic materials. These materials were based on polyimide (PI) and tetraethoxysilane (TEOS). Polyimide polymer is prepared from 4,4'-oxydianiline (ODA) 2,2-Bis( 3-amino- 4-hydroxyphenyl) hexafluoro-propane (6F-OHDA) pyromellitic dianhydride ( PMDA) polyamic polymer. In one family of hybrid materials 3-isocyanatopropyltriethoxysilane (ICTS) is used as coupling agent in order to enhance the interfacial interaction between polyimide and silica. It was possible to modulate the morphology as well as the optical and thermo-mechanical properties of these hybrid materials depending on the formulation used. TEM and SAXS analysis indicated that silica domains on the nanoscale level are obtained when coupling agent is used in the formulation. Additionally the TEM and SAXS analysis indicated that miscibility of the organic and the inorganic phases on the molecular scale is obtained in the hybrid films when ICTS as coupling agent is added to the polyamic acid. These techniques show a fractal structure of the hybrid materials with coupling agent. This was confirmed with DMTA analysis which shows very high temperature relaxation ( more than 450 degrees C). From this result it could be derived that the addition of ICTS causes a morphological transformation from discrete particulate microstructure to fine interpenetrated or co-continuous phases. The intimate miscibility of the phases is accompanied at the same time by the amelioration of thermo-mechanical properties of the hybrid films.
Link zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-31068
SciDok-Publikation: 30-Apr-2010
Fakultät: SE - Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:SciDok - Elektronische Dokumente der UdS

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