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Second fiber was epoxidated by using epichlorohydriri as etherifying agent. Effects of reaction time and reaction temperature on degree of substitution and epoxy value of the modified fiber were studied. Tt was indicated that they increases with pro longing of reaction time or increment of reaction temperature under 70。C, The characteristic absorption peaks of epoxidated fibers were observed from TR spectrum, which showed a lot of hydroxy Is on the fiber surface were replaced by the methyl epoxy group of epichlorohydrin. The calculations based on XRT) photo showed the crystalliriity was reduced to 21 A0% with the increased gap between molecular chains of modified fiber. TGA analysis indicated that thermal stability of fibers decreased slightly after modification. Tt was concluded in this paper that the rate constant of epoxidation of second fiber was ordered by 0J 1，0,25，0.35 under reaction temperature of 60,70 and 80, respectively. Activation energy of fiber epoxidation was 48.14 kJ/moL. [ABSTRACT FROM AUTHOR]