BRANCHED GLYCIDYL AZIDE COPOLYMERS

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Authors
  1. Bui, V.T.
  2. Rheaume, D.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN);Royal Military Coll of Canada, Kingston ONT (CAN) Dept of Chemistry and Chemical Engineering
Abstract
Second generation branched Glycidyl Azide Polymer (GAP) and branched Glycidyl Azide-Ethylene Oxide Copolymer (GEC) are synthesized at 120C according to the degradation process developed at DREV using polyepichlorohydrin (PECH) and polyepichlorohydrin-ethylene oxide copolymer (PEEC), respectively, as starting materials, under exactly the same experimental conditions. The main reaction parameters to be varied are: the type of polyol; either glycerol (GOL), trimethyol propane (TMP) or pentaerythritol (PE), as well as its proportion; the cleaving agent concentration; the reaction time and temperature. The average molecular weights (MW) of branched GAP and GEC are measured by the Gel Permeation Chromatography (GPC) and viscometry techniques. In general, GEC has MW values slightly higher than the corresponding branched GAP. Both products are then cured with isophorone diisocyanate (IPDI) at different values of the NCO/OH ratio. The obtained energetic polyurethanes are characterized using Scanning Electron Microscopy (SEM), Thermomechanical Analysis (TMA) and tensile tests. It is found that GEC yielded polyurethane products having higher elongations at break but lower tensile strengths than their branched GAP counterparts.
Keywords
GAP (glycidyl azide polymer) propellants;GEC (glycidyl azide-ethylene copolymer)
Report Number
DREV-CR-856 — Final Report
Date of publication
01 Oct 1995
Number of Pages
38
DSTKIM No
96-00416
CANDIS No
154752
Format(s):
Document Image stored on Optical Disk;Hardcopy

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