Influence of bismuth complex catalysts on the cure reaction of hydroxyl-terminated polyether-based polymer bonded explosives

Yapeng Ou, Qingjie Jiao*, Shi Yan, Yanli Zhu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The kinetics of catalyzed urethane-forming reactions of hydroxyl-terminated polyether (HTPE) with toluene di-isocyanate (TDI) in the presence of bismuth complex catalysts was investigated by non-isothermal differential scanning calorimetry (DSC). Fourier transform infrared spectroscopy (FTIR) was employed to monitor the chemical interactions of relevant groups. The kinetic parameters, including the apparent activation energy (Ea) and reaction rate constants (k) at typical temperatures calculated by the Kissinger and Crane methods, were used to evaluate the catalytic activities of triphenylbismuth (TPB) and tris(3-ethoxyphenyl)bismuthine (TEPB). The variations of Ea were studied to obtain an insight into the consistency of catalytic mechanism for the bismuth complex catalysts. The viscosity build-up of HTPE-based polymer bonded explosive (PBX) slurry was then measured to verify the catalytic activity and the pot-life during an actual manufacturing process, which fitted with the kinetics of the catalyzed cure reaction. The cure process was evaluated by the hardness of the PBX grains maintained at a temperature below typical manufacturing conditions. The results showed that TEPB is an effective catalyst, reducing the Ea of the cure reaction and the manufacturing temperature and time with an acceptable pot-life. The mechanical, thermal characteristics and compatibility of the HTPE-based PBXs were also investigated. The results suggest that TEPB is compatible with HTPE-based PBXs and contributes to improving the mechanical properties and thermal safety.

Original languageEnglish
Pages (from-to)131-149
Number of pages19
JournalCentral European Journal of Energetic Materials
Volume15
Issue number1
DOIs
Publication statusPublished - 2018

Keywords

  • Bismuth complex catalyst
  • HTPE
  • Manufacture time reduction
  • Mechanical and thermal characteristics
  • Pot-life

Fingerprint

Dive into the research topics of 'Influence of bismuth complex catalysts on the cure reaction of hydroxyl-terminated polyether-based polymer bonded explosives'. Together they form a unique fingerprint.

Cite this