NDLI: Synthesis, characterization and rheology of tetrafunctional glycidyl azide polymer vis-à-vis difunctional GAP

Content Provider	Springer Nature Link
Author	Soman, R. R. Athar, Javaid Agawane, N. T. Shee, Sujit Gore, G. M. Sikder, A. K.
Copyright Year	2015
Abstract	Glycidyl azide polymer (GAP) with hydroxyl functionality of two is a potential energetic binder for explosive and propellant formulations. To improve its curing behavior and mechanical properties, the synthesis of multifunctional GAP has been attempted. In the present paper, a tetrafunctional GAP (t-GAP) was synthesized by epoxidation of linear difunctional polyepichlorohydrin (PECH-diol) having molecular weight ~1700 and then epoxy ring opening in the presence of water to obtain tetrafunctional PECH (t-PECH) followed by azidation with sodium azide in presence of aprotic solvent. Both t-PECH and t-GAP were characterized by FTIR, NMR, molecular weight, viscosity and hydroxyl value. The viscosity built up and curing reaction with different curator was monitored by rheometer. Viscosity of t-GAP was found to be higher as compared to difunctional GAP. The decomposition pattern of t-GAP, as determined by DSC, was similar to GAP-diol with exothermic decomposition at 254 °C. Clean and void-free curing of t-GAP was achieved using IPDI only as a curator and the curing profile was recorded on rheometer. The curing of t-GAP has been compared with GAP-diol which was cured with mixture of IPDI and triisocyanate (Desmedour N-100). It was observed that t-GAP gave clean and void-free curing with single isocyanate, where as difunctional GAP did not cure with single isocyanate without additive. The mechanical properties for both the cured samples were determined and compared. The t-GAP showed almost fourfold increase in tensile strength when compared with difunctional GAP cured with mixed isocyanate.
Starting Page	449
Ending Page	461
Page Count	13
File Format	PDF
ISSN	01700839
Journal	Polymer Bulletin
Volume Number	73
Issue Number	2
e-ISSN	14362449
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-08-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Glycidyl azide polymer (GAP) Tetrafunctional GAP Curing profile Energetic binder Explosives and propellants Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Characterization and Evaluation of Materials Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Condensed Matter Physics Polymers and Plastics

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