Accession Number : AD0685635

Title :   HYPOTHESIS OF SILOXANE DEGRADATION OF HIGH TEMPERATURE AND THE EFFECT OF CERIUM-BASED INHIBITOR,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Britt,A. D. ; Moniz,W. B.

Report Date : 13 MAR 1969

Pagination or Media Count : 14

Abstract : The cerium-based inhibitor for extending gelation times of commercial silicones is considered from the standpoint of the relatively fixed proportions of reactants necessary for optimum stabilization. A connection is made between these fixed proportions and the hydride/silanol content of the commercial silicone itself. The release of H2O by the high-temperature condensation of silanol groups does not lead to the simple evolution of H2O vapor but rather to a rapid catalytic attack by H2O on the siloxane chain. The beneficial effects of the cerium inhibitor can be rationalized in terms of eliminating the source of high-temperature H2O evolution. (Author)

Descriptors :   (*SILOXANES, *THERMAL STABILITY), (*CERIUM COMPOUNDS, ADDITIVES), (*HYDRAULIC FLUIDS, SILOXANES), POLYMERS, DEGRADATION, PENTANONES, COMPLEX COMPOUNDS, WATER, CONDENSATION REACTIONS, HYDROLYSIS

Subject Categories : Polymer Chemistry
      Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE