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

التفاصيل البيبلوغرافية
العنوان: Synthesis, characterization and rheology of tetrafunctional glycidyl azide polymer vis-à-vis difunctional GAP
المؤلفون: R. R. Soman, G.M. Gore, Arun K. Sikder, N. T. Agawane, Javaid Athar, Sujit Kumar Shee
المصدر: Polymer Bulletin. 73:449-461
بيانات النشر: Springer Science and Business Media LLC, 2015.
سنة النشر: 2015
مصطلحات موضوعية: Materials science, Polymers and Plastics, Rheometer, 02 engineering and technology, General Chemistry, Epoxy, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Isocyanate, 0104 chemical sciences, Solvent, chemistry.chemical_compound, chemistry, visual_art, Polymer chemistry, Hydroxyl value, Materials Chemistry, visual_art.visual_art_medium, Sodium azide, Fourier transform infrared spectroscopy, 0210 nano-technology, Curing (chemistry)
الوصف: 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.
تدمد: 1436-2449
0170-0839
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::6a4715481eed843ce81dc39ad138ed48
https://doi.org/10.1007/s00289-015-1500-7
حقوق: CLOSED
رقم الأكسشن: edsair.doi...........6a4715481eed843ce81dc39ad138ed48
قاعدة البيانات: OpenAIRE