Please use this identifier to cite or link to this item: doi:10.22028/D291-24530
Title: 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
Author(s): Kaddami, Hamid
Becker-Willinger, Carsten
Schmidt, Helmut K.
Language: English
Year of Publication: 2006
OPUS Source: e-Polymers. - 2006, 10 [Elektronische Ressource]
SWD key words: Organisch-anorganischer Hybridwerkstoff
In situ
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: 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 to this record: urn:nbn:de:bsz:291-scidok-31068
Date of registration: 30-Apr-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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