Energetic Binder Production
Abstract
PBEP has been fractionated by solvent gradient elution from a Chromosorb W-packed column. Molecular weight distribution of the polymer has been determined and the fractions evaluated through exhaustive analyses and small scale cure studies. PBEP has been also separated into two fractions by extraction with carbon tetrachloride. The properties of the fractions have been compared and the more promising higher molecular weight fraction extensively evaluated. Fractionating of the polymer at an earlier stage in the synthesis has been investigated. Polyepichlorohydrin (PECH) has been separated into two fractions and the higher molecular weight fraction evaluated by conversion to PBEP. The carbon treatment of PBEP has produced promising improvements in the thermal stability of the polymer and in reducing the deactivating effect of the latter on the cure catalyst. Small scale curing studies have compared the reaction of tolylene diisocyanate (TDI) with PBEP and other ingredients in the cure system. Deactivation of the cure catalyst by PBEP has been demonstrated and promising leads towards prevention have been investigated. Large scale batch preparations of polyepichlorohydrin (PECH) and dehydrochlorinated PECH (DEPECH) have been carried out. A two-stage continuous reactor system for difluoramination of DEPECH has been constructed and operated for the production of experimental quantities of PBEP for evaluation by propellant contractors. A brief investigation of the process variables has been carried out to determine near optimum conditions for the continuous system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1968
- Accession Number
- AD0394194
Entities
People
- E. E. Ryder
- Laura Hunter