Evaluation of Branched Glycidyl Azide Polymer Purified by Solvent Extraction

Autor:	Elie Ahad, Dany Rheaume, Van Tam Bui, Robert D. Whitehead
Rok vydání:	1997
Předmět:	Dimethyl sulfoxide General Chemical Engineering General Chemistry Isocyanate Industrial and Manufacturing Engineering Solvent chemistry.chemical_compound chemistry Polymer chemistry Proton NMR Azide Glass transition Curing (chemistry) Dichloromethane
Zdroj:	Industrial & Engineering Chemistry Research. 36:2219-2224
ISSN:	1520-5045 0888-5885
DOI:	10.1021/ie9604177
Popis:	Dimethyl sulfoxide (DMSO), a polar liquid of low volatility, was used as solvent in the synthesis of branched glycidyl azide polymer (GAP) which is a potential energetic binder for rocket propellants. Branched GAP product was purified by an extraction method using dichloromethane to create an organic phase and a mixture of methanol-brine (50:50 in weight) as the extracting solution. The extraction was carried out in four steps, leaving only less than 1% DMSO in the purified branched GAP. The DMSO concentration remaining in the organic phase was deduced from the {sup 1}H NMR spectra taken after each extraction step. Finally, the physical performance of branched GAP was evaluated through the tensile properties, the glass transition temperature, and the thermal degradation of the energetic polyurethanes obtained after curing branched GAP with different isocyanate compounds. The effect of residual DMSO in branched GAP on the tensile properties of polyurethanes was also investigated.
Databáze:	OpenAIRE
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