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Keywords:

  • HTPB;
  • ferrocenyl silane;
  • hydrosilylation;
  • DSC;
  • TGA

Abstract

We synthesized a ferrocene-based burning rate catalyst, 2-(ferrocenylpropyl) dimethylsilane (FPDS). FPDS-grafted hydroxyl-terminated polybutadiene (FPDS-g-HTPB) was synthesized using hydrosilylation with a Pt catalyst. The structures of FPDS and FPDS-g-HTPB were investigated by Fourier transform infrared spectroscopy and nuclear magnetic resonance. HTPB-based polyurethanes were prepared from HTPB, 6-hexamethylenediisocyanate (HDI), and HDI-trimer. Polyurethane network was prepared with an (NCO)/(OH) ratio of 1.05 and an [isocyanate trimer]/[total NCO] ratio of 0.3 then subjected to accelerated aging at 80°C. The thermal behaviors of the polyurethane network were compared using differential scanning calorimetry and thermal gravity analysis. The glass transition temperatures (Tg) of HTPB and FPDS-g-HTPB were −76°C and −47°C, respectively. The value of Tg for the networked polyurethane was not influenced by HDI-trimer content but by FPDS content. The decomposition temperature of the neat HTPB-based polyurethane network was lower than that of the FPDS-g-HTPB-based polyurethane networks. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011