Influences of complex curing reagents on mechanical properties of PBT matrix

Jin Xian Zhai*, Rong Jie Yang, Hou Lang Liu, Zi Ping Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

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 languageEnglish
Pages (from-to)31-34
Number of pages4
JournalHuozhayao Xuebao/Chinese Journal of Explosives and Propellants
Volume32
Issue number6
Publication statusPublished - 2009

Keywords

  • BAMO-THF copolyether
  • Bimodal networks
  • Curing reagent
  • Mechanical properties
  • Physical chemistry

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