Please use this identifier to cite or link to this item: doi:10.22028/D291-24537
Title: Synthesis and characterization of polyimide-silica hybrids : effect of matrix polarity on the mechanical and thermal properties
Author(s): Rehman, Habib U.
Schmidt, Helmut K.
Ahmad, Z.
Language: English
Year of Publication: 2006
OPUS Source: Journal of macromolecular science / A . - 43. 2006, 4/5, S. 703-717
SWD key words: Polyimide
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: Polyimide-silica hybrid materials have been prepared through the sol-gel process by mixing various proportions oftetraethoxysilane (TEOS) with polyamic acids (PAAs). Two types of PPAs were employed. The first was obtained by reacting an equimolar mixture of oxydianiline (ODA) andpyromellitic dianhydride (PMDA) in dimethylactamide (DMAc) as solvent. The second was prepared using a mixture of ODA and 2,2-Bis(3-amino-4-hydroxyphenyl)hexafluoropropane (6F-OHDA) in molar ratio 9:1, respectively and reacting with a stoichiometric amount of PMDA in DMAc. Polyamic acids were converted to polyimides and a sol-gel reaction proceeded simultaneously by heating the hybrid films to 300°C. The hydroxyl groups from 6F-OHDA allows the secondary bonding between the polyimide and growing silica phase and thus retard the gross phase separation. Only the 10mol% addition of 6F-OHDA in the polyimide chain resulted in a drastically different microstructure for the resulting hybrids. SEM, stress-strain analysis, temperature variation of storage and loss modulus, and thermal stability were used to characterize the hybrid materials. Properties of both types of hybrids have been compared and related to the two different types of structures of polyimides used in the preparation of the hybrids.
Link to this record: urn:nbn:de:bsz:291-scidok-31111
Date of registration: 3-May-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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