Accession Number : AD0509258

Title :   PBEP Improvement.

Descriptive Note : Final technical rept. 1 Oct 68-31 Dec 69,

Corporate Author : SHELL DEVELOPMENT CO EMERYVILLE CALIF

Personal Author(s) : Hunter,L. ; Petty,W. L. ; Ryder,E. E. , Jr

Report Date : JUN 1970

Pagination or Media Count : 89

Abstract : Further improvements of the chemical and physical properties of PBEP through modification of existing reaction parameters and various post-treatments were investigated. Characterization and evaluation of PBEP prepared from fractionated polyepichlorohydrin showed that this procedure was less effective than fractionation of PBEP itself, due to degradation during the difluoramination step in the synthesis. Employment of additives and alteration of reaction conditions did not afford PBEP of further improved properties. Improvements in thermal stability and curing characteristics were shown in a study in which PBEP was treated variously with carbon, ion exchange resins, alumina, organic bases and molecular sieves. Molecular sieves were shown to have a substantial effect on increasing the rate of the PBEP-tolylene diisocyanate cure reaction and in reducing catalyst requirement levels. Cure catalyst (dibutyltin diacetate) deactivation was investigated and methods were found to eliminate or circumvent the problem. The catalytic activity of dibutyltin difluoride, a possible product of the deactivation reaction, was studied. The compatibility of various samples of PBEP with aluminum hydride was investigated using modified Taliani units. Little difference between PBEP samples was found and no incompatibility of PBEP with aluminum hydride was indicated. A number of experimental PBEP samples were prepared in sufficient quantity for evaluation in aluminum hydride formulations by the Lockheed Propulsion Company. A partially dehydrofluorinated PBEP was prepared and briefly evaluated as a potentially highly thermally stable energetic binder. (Author)

Descriptors :   (*SOLID ROCKET PROPELLANT BINDERS, CHEMICAL REACTIONS), OPTIMIZATION, SYNTHESIS(CHEMISTRY) (U) FLUOROAMINES, ALKANES, ADDITIVES, THERMAL STABILITY, AGING(MATERIALS), CURING AGENTS, CATALYSTS, ALUMINUM COMPOUNDS, HYDRIDES, NITRILES, ALCOHOLS, HYDROLYSIS, ALUMINA, CARBONATES, HYDROXIDES, CALCIUM COMPOUNDS, SODIUM COMPOUNDS, HYDRAZINE, ION EXCHANGE RESINS

Subject Categories : Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE