Accession Number:

ADA021260

Title:

Formulations of meta-Carborane-Siloxanes.

Descriptive Note:

Technical rept.,

Corporate Author:

UNION CARBIDE CORP TARRYTOWN N Y CORPORATE RESEARCH LAB

Personal Author(s):

• Peters,E. N.
• Stewart,D. D.
• Bohan,J. J.
• Kwiatkowski,G. T.
• Beard,C. D.

Report Date:

1975-12-04

Pagination or Media Count:

28.0

Abstract:

D2-meta-carborane-siloxane polymers have been developed for ultrahigh temperature elastomer applications. In particular, these materials have outstanding thermal stability in addition to fire and chemical resistance. Basic studies relating to resin-filler interactions, polymer structure, peroxide and extending fillers on thermal stability have been carried out. The optimization studies have afforded valuable information leading to both improvements in long term aging stability and fabrication characteristics. The use of hydrophobic silica as a reinforcing agent instead of a fumed silica resulted in substantial improvements in retention of properties after aging. Furthermore the use of high molecular weight stock and lower peroxide levels for curing has led to a system with outstanding retention of properties after heat aging in air at 315C. These unique high performance capabilities are being confirmed in sealant, gasket, O-ring, and coating applications.

Descriptors:

• *SYNTHESIS(CHEMISTRY)
• *ELASTOMERS
• *THERMAL STABILITY
• *SILOXANES
• MECHANICAL PROPERTIES
• OPTIMIZATION
• PERFORMANCE TESTS
• PHYSICAL PROPERTIES
• HIGH TEMPERATURE
• COATINGS
• CROSSLINKING(CHEMISTRY)
• SEALING COMPOUNDS
• REINFORCING MATERIALS
• GASKETS
• FILLERS
• CARBORANES
• VULCANIZATES

Subject Categories:

• Elastomers and Rubber

Distribution Statement:

APPROVED FOR PUBLIC RELEASE