Thermal degradation kinetics of poly (p-phenylene terephthalamide) fiber measured by thermogravimetry，2009先进纤维与聚合物材料国际学术会议（ICAFPM，10.21-10.24，上海）-中国聚合物网,论文下载

Thermal degradation kinetics of poly (p-phenylene terephthalamide) fiber measured by thermogravimetry

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PPTA thermal degradation kinetics parameter TG

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675K

所属学科：

分子表征

来源：

2009先进纤维与聚合物材料国际学术会议（ICAFPM，10.21-10.24，上海）

简介：

Thermogravimetryanalysis(TG)techniquehasbeenperformedforevaluatingthethermaldegradationandthekineticsparametersofPoly(p-phenyleneterephthalamide)(PPTA)fiberfrom25to900℃undernitrogenandairatmosphere.ThedecompositionrateandthecharacteristictemperaturesareachievedfromboththeTGandDTGcurves.ThethermaldegradationofKevlarfiberfollowsmorethanonemechanism.ThedifferentmethodshavebeenintroducedtodescribethedegradationkineticsofPPTAfiber.Therespectiveactivationenergy,reactionorderandthepreexponentialfactorofthedegradationofPPTAareachieved.TheresultsshowthattheactivationenergyandreactionorderofPPTAarehigherinnitrogenthaninair,whichmeansthatthethermostabilityofthefiberdependsnotonlyonitsnativecharacter,butalsoonthetestingatmosphere.Thethermostablepropertiesofthesefibersinnitrogencanbeusedtoreflecttheirnaturalcharacterwithouttheconcurrentthermooxidativeeffect.Thekineticparametersbasedondifferentanalyticalapproachtakenintheanalysesaresummarizedforcomparativepurposes.Thecorrelationcoefficient,largerthan0.996,wasobtainedthroughtheCoats-Redfernmethod.TheTGcurvesofPPTAfiberappeartobethebestfitfortheCoats-Redfernequation.Obviously,combiningdifferentmathematicalmethodsconducedtosolvethecomplexthermaldegradationofPPTAfiber.

作者：

LIU Junjie, YU Weidong

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2010-03-22 16:25:34

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