Accession Number:

ADA183448

Title:

Polymerization Kinetics of Polysilazane by Transition Metal Catalyzed Dehydrocoupling Reaction.

Descriptive Note:

Technical rept.,

Corporate Author:

SRI INTERNATIONAL MENLO PARK CA

Personal Author(s):

• Chow,Andrea W.
• Hamlin,Richard D.
• Blum,Yigal
• Laine,Richard M.

Report Date:

1987-07-01

Pagination or Media Count:

17.0

Abstract:

We have examined the polymerization kinetics of transition metal dehydrocoupling of the Si-H and N-H bonds of oligomers of the type HNMe-H2SiNMex-H by size exclusion chromatography and correlated molecular weight changes with changes in shear viscosity. Analysis using simplified statistical theory that branching is a mechanism for polymerization and lends to gelation. Keywords Polysilazanes Preceramic polymers, Bond activation catalysis Silanes, Ammonia Polymerization kinetics, Silicon , Hydrogen.

Descriptors:

• *POLYMERIZATION
• *POLYMERS
• *SILANES
• AMMONIA
• CHROMATOGRAPHY
• HYDROGEN
• KINETICS
• SHEAR PROPERTIES
• VISCOSITY
• SILICON
• TRANSITION METALS
• ACTIVATION
• BONDING
• CATALYSIS
• GELATION
• MOLECULAR WEIGHT
• SIMPLIFICATION
• STATISTICS
• THEORY

Subject Categories:

• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE