Tailoring the microstructure of polyimide-silica materials using the sol-gel process

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:427696

Schrotter, J C; Smaihi, M; Guizard, C ^[1]

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1. CNRS, Montpellier (France)

Polyimide-silica materials have been prepared via the sol-gel process by mixing tetramethoxysilane with a polyamic acid. Two polyamic acids have been used. The first is obtained with an equimolar mixture of oxydianiline (ODA) and pyromellitic dianhydride (PMDA) in dimethyacetamide. The second is prepared with a mixture of PMDA with aminopropyltrimethoxysilane (APrTMOS). The microstructure of the materials obtained with these two polyamic acids are drastically different. The presence of both amino and methoxy side-groups on the APrTMOS enables a chemical bonding between the organic and the inorganic networks resulting in the formation of homogeneous films. On the other side, no chemical bond is provided by the ODA-PMDA polyamic acid resulting in a biphasic microstructure where pure silica particles are embedded in a polyimide matrix. These two types of materials have been characterized in order to point out the key parameters of their microstructure. {sup 29}Si NMR, thermogravimetric analysis, scanning electron microscopy and infra-red spectroscopy have been used to study materials containing various proportions of TMOS and prepared with various hydrolysis ratios.

• OSTI ID: 427696
• Report Number(s): CONF-960401--; ISBN 1-55899-338-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL BONDS
CHEMICAL COMPOSITION
DEHYDROCYCLIZATION
EXPERIMENTAL DATA
HYDROLYSIS
IMIDES
INFRARED SPECTRA
MICROSTRUCTURE
NUCLEAR MAGNETIC RESONANCE
ORGANIC ACIDS
ORGANIC SILICON COMPOUNDS
PARTICLE SIZE
POLYMERS
SCANNING ELECTRON MICROSCOPY
SILANES
SILICA
SOL-GEL PROCESS
THERMAL GRAVIMETRIC ANALYSIS