IMPROVED PROCESS FOR THE SYNTHESIS OF SECOND GENERATION BRANCHED GAP

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Authors
  1. Ahad, E.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
Second generation branched Glycidyl Azide Polymer (GAP) is preapred according to a novel single-step degradation process developed at DREV by reacting a high molecular weight (MW approximates E6) commercial rubbery polyepichlorohydrin (PECH) with sodium azide and a basic cleaving agent in the presence of a polyol for a few hours at elevated tempertaure in a polar organic solvent. However, in this process, the cleaving agent and/or the polyol are optional. For reactions involving a cleaving agent, the hydroxyl functionality of the GAP product is between 2 and 10 and the MW may be controlled and predetermined in the MW range 1000-40,000 by varying the concentration of the cleaving agent in the reaction mixture. For reactions without a cleaving agent, the MW of the product is between 40,000 and 200,000 and the functionality is equal to, or above 10. The effect of some reaction parameters on the properties (MW, viscosity, hydroxyl content and functionality) of the branched GAP product was studied. The sysnthesis parameters investigated are the reaction time and temperature, the type and concentration of the cleaving agent, polyol and solvent as well as the sequence of addition of the reactants. TRUNCATED
Keywords
GAP (glycidyl azide polymer) propellants
Report Number
DREV-9414 —
Date of publication
01 Nov 1994
Number of Pages
60
DSTKIM No
95-03595
CANDIS No
151727
Format(s):
Document Image stored on Optical Disk;Hardcopy

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