Acta Chimica Sinica ›› 2020, Vol. 78 ›› Issue (4): 337-343.DOI: 10.6023/A19120419 Previous Articles     Next Articles



武艳a, 庞爱民b, 胡磊c, 何根升a, 张莹莹a, 张利雄c, 李明海a, 马振叶a   

  1. a 南京师范大学化学与材料科学学院 南京 210097;
    b 湖北航天化学技术研究所 航天化学动力技术重点实验室 襄阳 441003;
    c 南京工业大学材料化学工程国家重点实验室 南京 210009
  • 投稿日期:2019-12-09 发布日期:2020-03-12
  • 通讯作者: 李明海, 马振叶;
  • 基金资助:

Preparation of α-Fe2O3/(IPDI-HTPB) Composite Nanoparticles and Their Catalytic Performance

Wu Yana, Pang Aiminb, Hu Leic, He Genshenga, Zhang Yingyinga, Zhang Lixiongc, Li Minghaia, Ma Zhenyea   

  1. a College of Chemical and Material Science, Nanjing Normal University, Nanjing 210097;
    b Science and Technology on Aerospace Chemical Power Laboratory, Institute of Aerospace Chemotechnology, Xiangyang 441003;
    c State Key Laboratory of Material-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009
  • Received:2019-12-09 Published:2020-03-12
  • Supported by:
    Project supported by the Science and Technology on Aerospace Chemical Power Laboratory (No. STACPL120181B02-2).

In ammonium perchlorate (AP) based composite propellants, α-Fe2O3 nanoparticles and hydroxyl terminated polybutadiene (HTPB) are commonly used as catalyst and binder respectively. Their properties and dispersion significantly affect the combustion performance of the composite propellants. However, α-Fe2O3 nanoparticles are hard to disperse uniformly in the binder HTPB owing to the high viscosity, which will decrease their catalytic activity. Directly composite processing of α-Fe2O3 nanoparticles with other main components of composite propellants may be an effective strategy to prevent from aggregation without introducing other components to the solid propellant at the same time. In this paper, the α-Fe2O3/ (IPDI-HTPB) composite nanoparticles were prepared by choosing curing agent isophorone diisocyanate (IPDI) as grafting bridge. The typical procedure was as follows: (1) The first step was to synthesize IPDI-HTPB. In order to adjudged the reaction terminal point of IPDI and HTPB, the reaction kinetics of HTPB and IPDI were first researched and the proper reaction conditions were chosen as follows:molar ratio of HTPB and IPDI is 1:1, reaction temperature is under 80℃ and reaction time is 2 h. (2) The second step was to synthesize α-Fe2O3/(IPDI-HTPB) composite nanoparticles. Firstly, the stoichiometric α-Fe2O3 nanoparticles were dispersed in toluene under ultrasound for 10 min. Secondly, the mixture were added in the above IPDI-HTPB solution and the reaction kept for 4 h. Thirdly, the α-Fe2O3/(IPDI-HTPB) composite nanoparticles were centrifuged and washed with toluene and ether for several times. Finally, α-Fe2O3/(IPDI-HTPB) composite nanoparticles were dried in the oven at 80℃ for 12 h. (3) The structure of α-Fe2O3/(IPDI-HTPB) composite nanoparticles were characterized by X-ray diffractometer (XRD), transmittance electron microscopy (TEM), Fourier transform infrared spectrometer (FTIR) and thermogravimetric analysis (TGA). It was observed that HTPB could be chemically coated on the surface of the α-Fe2O3 nanoparticles by the grafting activity of IPDI. The depth of the IPDI-HTPB was nearly 5 nm. The α-Fe2O3/(IPDI-HTPB) composite nanoparticles showed hydrophobicity after the composite process. Compare with the pure α-Fe2O3 nanoparticles, α-Fe2O3 nanoparticles in α-Fe2O3/IPDI-HTPB composite nanoparticles showed better catalytic activity on the thermal decomposition of AP.

Key words: α-Fe2O3 nanoparticles, hydroxyl terminated polybutadiene (HTPB), composite nanoparticles, catalytic activity