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

PDF Url : ADA183448

Report Date : 01 Jul 1987

Pagination or Media Count : 17

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-(H2SiNMe)x-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