科研之友
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摘要
High performance fibers, such as polymer material, have extensive applications in aerospace and high temperature environment. When these fibers were used in such high temperature, these would be subjected to degradation. Thermogravimetry analysis technique has been performed for evaluating the thermal degradation and the kinetics parameters of high performance fibers from 50 to 800 C under air atmosphere. The decomposition rate and the characteristic temperatures of fibers are achieved from both the TG and DTG curves. The kinetics of the thermal degradation has also been analyzed according to the Freeman-Carroll method and the activation energies of the fibers were estimated. The respective activation energy and reaction order of the degradation of four kinds of high performance fibers are achieved. It indicated that the initial degradation temperature of the PBO is the highest but its activation energy is not the highest in air. The initial degradation temperature of Nomex fiber is the lowest, but the end decomposition temperature of Nomex is highest.
