Abstract
In order to improve the mechanical properties of composite PBT (BAMO-THF, bis-azidomethyl oxetane and tetrahydrofuran copolyether ) propellants, the effect of content ratio of complex curing reagents, polyisocyanate NlOO and 2,4-diisocyanatotoluene (TDI), on PBT matrix was investigated. Theoretical calculation indicated that with the content of TDI increasing, network chain densities decrease from 8. 15× 10-5mmol/cm3to 3. 29 × 10-5mmol/cm3 and number-average molecular weights increase from 5 639 to 14 089. Uniaxial elongation measurements showed that the stresses of the matrixes exist a peak value of 0. 061MPa though the strains increase gradually from 99% to 273% with the increase in TDI content. Rheological measurements indicated that the matrix simultaneously possesses a higher stress and strain due to the formation of bimodal networks, as TDI and N100 are added in mass ratio of 1. 608: 0. 491.
Original language | English |
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Pages (from-to) | 31-34 |
Number of pages | 4 |
Journal | Huozhayao Xuebao/Chinese Journal of Explosives and Propellants |
Volume | 32 |
Issue number | 6 |
Publication status | Published - 2009 |
Keywords
- BAMO-THF copolyether
- Bimodal networks
- Curing reagent
- Mechanical properties
- Physical chemistry