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非等温DSC研究Al/HTPB/TDI体系的固化反应动力学
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Curing Kinetics of HTPB/TDI/Al System by Non-isothermal DSC
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    采用非等温差示扫描量热法(DSC)研究了铝粉对端羟基聚丁二烯/甲苯二异氰酸酯体系(HTPB/TDI)固化反应动力学的影响。结果表明,HTPB/TDI体系的固化反应表观活化能约为51.826 kJ·mol-1,反应级数为0.926,指前因子为2.412×105 min-1; 加入铝粉后,体系的固化峰温降低,表观活化能、反应级数和指前因子分别提高至76.402 kJ·mol-1、0.944、2.53×108 min-1,机理函数仍遵循Avrami-Erofeev方程G(α)=[-ln(1-α)]n,只是方程中的指数n有所变化。铝粉对HTPB/TDI固化反应的影响表现为在反应程度18%前起加速作用,18%后起延缓作用。浅析了铝粉影响HTPB/TDI体系固化的原因。

    Abstract:

    Curing processes of HTPB/TDI and Al/HTPB/TDI composites were measured by non-isothermal differential heating calorimetry at different scanning rates. Results show that the values of apparent activation energy,reaction order and frequency factor of HTPB/TDI system are 51.826 kJ·mol-1,0.926,2.412×105 min-1,respectively. After adding aluminum powder,the peak temperature of the curing process is decreased. The values of apparent activation energy,reaction order and frequency factor are increased to be 76.402 kJ·mol-1,0.944,2.53×108 min-1,respectively. The curing reaction mechanism of HTPB/TDI meets Avrami-Erofeev Equation G(α)=[-ln(1-α)]n. The addition of aluminum powder into HTPB/TDI curing system only makes little change on index n. The curing reaction of HTPB/TDI can be accelerated by aluminum powder for the initial 18% of reaction extent and aluminum powder slows down the curing reaction for the latter 82% of reaction extent.

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刘晶如,罗运军.非等温DSC研究Al/HTPB/TDI体系的固化反应动力学[J].含能材料, 2009, 17(1):83-86.
LIU Jing-ru, LUO Yun-jun. Curing Kinetics of HTPB/TDI/Al System by Non-isothermal DSC[J]. Chinese Journal of Energetic Materials, 2009, 17(1):83-86.

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  • 收稿日期: 2008-08-26
  • 最后修改日期: 2008-10-20
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  • 在线发布日期: 2011-11-04
  • 出版日期: 2009-02-25