Accession Number : ADA234285


Title :   Supercritical Fluid Processing of Propellant Polymers


Descriptive Note : Final rept. Sep 1989-Sep 1990


Corporate Author : PHASEX CORP LAWRENCE MA


Personal Author(s) : Watkins, James J ; Krukonis, Val J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a234285.pdf


Report Date : Jan 1991


Pagination or Media Count : 62


Abstract : Polymeric pre-propellant binders are known to be heterogeneous materials exhibiting significant variation with respect to molecular weight, structure, functionally, and related performance properties. The objective of this program was to demonstrate the feasibility of fractionating propellant binders with supercritical fluid (SCF) solvents. Hydroxy-terminated polybutadiene (HTPB) (R-45M, Atochem North America) was fractionated with supercritical propane yielding ten fractions with number average molecular weights ranging from 780 to 11760 and polydispersities of approximately 1.2. The increase in hydroxyl equivalent weight with nonlinear, with functionality increasing rapidly in the higher molecular weight fractions. Non-functional cyclic and other low molecular weight components were effectively extracted from glycidyl azide polymer (GAP) using supercritical carbon dioxide as evidenced by HPLC analysis.


Descriptors :   *POLYMERS , HYDROXY TERMINATED POLYBUTADIENE , PROCESSING , HIGH TEMPERATURE , MOLECULAR WEIGHT , GASES , PROPELLANTS , HETEROGENEITY , SOLVENTS , FLUIDS , SUPERCRITICAL FLOW , GLYCIDYL ETHER , CARBON DIOXIDE , BINDERS , POLYBUTADIENE , HYDROXYL RADICALS , PROPANE , NORTH AMERICA , AZIDES , FRACTIONATION , PHASE TRANSFORMATIONS , MATERIALS


Subject Categories : Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE