TG研究纤维的热分解动力学

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1、ThermalDecompositionofNaturalFibers:GlobalKineticModelingwithNonisothermalThermogravimetricAnalysis112FeiYao,QinglinWu,DingguoZhou1SchoolofRenewableNaturalResources,LouisianaStateUniversityAgriculturalCenter,BatonRouge,Louisiana708032CollegeofWoodScienceandTechnology,NanjingForestryUniversity,Nanjin

2、g210037,Jiangsu,ChinaReceived24January2009;accepted19March2009DOI10.1002/app.30439Publishedonline15June2009inWileyInterScience(www.interscience.wiley.com).ABSTRACT:Themodelingofthermaldecompositionactivationenergyrangeof160–170kJ/mol;parameternnprocessoftennaturalfiberscommonlyusedinpolymerinRO(n>1)¼

3、(1
a)of3–4;andlnAbetween35and
1compositeindustrywasperformedbyassumingaglobal42lns.Someconditionlimitationsoftheobtainedmodeloccurringwithintheentiredegradationrangewithmodelwerealsodiscussed.Themodelhaspracticalsig-considerationoffiberasonepseudocomponent.Ma´leknificanceinpredictingfiberweightlosswhen

4、thefiberismethodwithactivationenergyvaluespreviouslyusedincombinationwithengineeringthermoplastics.obtainedwasappliedtothemodelingprocess.CarefulVC2009WileyPeriodicals,Inc.JApplPolymSci114:834–calculationandevaluationindicatedthat,withinanac-842,2009ceptableerrorlimitof5%,RO(n>1)modelcanbeusedtodescr

5、ibethedegradationprocessofmostselectedKeywords:thermogravimetricanalysis(TGA);fiberswell.Theotherkineticparametersusedincludecomposites;kinetics(polym.);modeling;fibersINTRODUCTIONresultofbeinglignincellulosicmaterial.ThecommonthermaldecompositioncurvesoffibersNaturalfiberfillersfromagriculturalresiduesa

6、ndshowedadistinctDTGpeak(cellulose)andhigh-forestproductsprocessingaresubjectedtothermaltemperature‘‘tails’’(lignin).Also,thelow-tempera-degradationduringpolymercompositeprocessing.ture‘‘shoulder’’canbeseeninsomefiberdecompo-Itis,therefore,ofpracticalsignificancetounder-sitioncurves.Thecharacteristics

7、ofallselectedstandandmodelthedecompositionprocessofthenaturalfibersshowedthatmainthermaldecomposi-fibers.Numerouskineticschemesandmodelstionfraction(around60%)happenedinatempera-regardingtothefiberdegrad