Analytical testing and characterization of three polysiloxane gums. [RG97, SE54, Y3976]

Conference · Mon Apr 28 04:00:00 EDT 1980

OSTI ID:5429491

Kolb, J R; Cady, W E; Jessop, E S; Hoffman, D M

Because of the termination of both silicone gums and cellular silicone products by Union Carbide Corporation, it has been necessary to evaluate commercial alternatives as well as potential developmental polymer replacements for W97. For this reason, LLNL, Bendix Corporation, and the Pantex plant have undertaken the development of characterization methodology for silicone gums as well as the concomitant chemical and physical analyses of the polysiloxanes RG97, SE54 and Y3976. The most viable test battery to arise from this study is the determination of anti M/sub w/, anti M/sub n/, and MWD by GPC, vinyl and phenyl contents of the gums by magnetic resonance or chromatographic techniques, and volatile content of the gums by thermogravimetric analysis. A comparison of the siloxane gums indicates that the random SE54 is a high phenyl content, high molecular weight, low volatile resin of high quality. RG97 is in contrast a relatively low molecular weight, high volatile content gum that is inferior to SE54. The developmental material Y3976, which is synthesized by a different procedure, is close in properties to the SE54 gum but is somewhat lower in phenyl content. 3 figures, 10 tables.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5429491
• Report Number(s): UCRL-84351; CONF-800628-1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
GUMS
MOLECULAR WEIGHT
POLYMERS
SILICONES
SILOXANES
VISCOSITY
VOLATILE MATTER