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首页> 外文期刊>Journal of Applied Polymer Science >Thermal Degradation of Kevlar Fiber by High-Resolution Thermogravimetry
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Thermal Degradation of Kevlar Fiber by High-Resolution Thermogravimetry

机译：高分辨率热重分析法对芳纶纤维的热降解

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摘要

A novel high-resolution thermogravimetry (TG) technique in a variable heating rate mode that maximizes resolution and minimizes the time required for TG experiments has been performed for evaluating the thermal degradation and its kinet-ics of Kevlar fiber in the temperature range approx 25-900degC .The degradation of Kevlar in nitrogen or air occurs in one step.The decomposition rate and char yield at 900degC are higher in air than in nitrogen,but the degradation temperature is higher in nitrogen than in air.The initial degradation temperature and maximal degradation rate for Kevlar are 520degC and 8.2%min in air and 530degC and 3.5%min in nitrogen.The different techniques for calculating the kinetic parameters are compared.The respec-tive activation energy,order,and natural logarithm of preexponential factor of the degradation of Kevlar are achieved at average values of 133 kJ/mol (or 154 kJ/mol),0.7(or 1.1),and 16 min~-1 (or 20 min~-1) in air (or nitrogen).The technique based on the principle that the maximum weight loss rate is observed at the minimum heating rate gives thermal degradation results that were in excellent agreement with values deter-mined by traditional TG experiments.
机译：已进行了一种新颖的高分辨率热重分析（TG）技术，该技术以可变的加热速率模式实现了最大的分离度并最大程度地减少了TG实验所需的时间，以评估凯夫拉尔纤维在大约25-70°C的温度范围内的热降解及其动力学。 900degC.Kevlar在氮气或空气中的降解是一步发生的.900degC时空气中的分解速率和炭产率高于氮气，但氮气中的分解温度高于空气。初始降解温度和最大降解空气中凯夫拉尔的速率为520°C和8.2％min，氮气中为530°C和3.5％min。比较了动力学参数的不同计算方法。在空气（或氮气）中，芳纶的平均值分别为133 kJ / mol（或154 kJ / mol），0.7（或1.1）和16 min〜-1（或20 min〜-1）。的在最小加热速率下观察到最大失重率的原理给出的热降解结果与传统TG实验确定的值非常吻合。

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