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Kinetics Analysis of Non-Isothermal Degradation of Polybenzoxazine-Woodflour Composites  
Kinetics Analysis of Non-Isothermal Degradation of Polybenzoxazine-Woodflour Composites
資料類型: PDF文件
關(guān)鍵詞: polybenzoxazine  wood  composites  non-isothermal  degradation  kinetics  
資料大小: 104K
所屬學(xué)科: 分子表征
來源: 第六屆亞歐研討會(huì)上處理和性能增強(qiáng)聚合物會(huì)議文集(2013.6.2-6 武漢)
簡(jiǎn)介:
Thisstudyevaluatesdegradationkineticparameters,i.e.ctivationenergy(Ea),pre-exponentialfactor(A)anddegradationmechanism(f(x》ofpolybenzoxazine(PBZ)woodviadistributedactivationenergymodel(DAEM),Coats-Redfernmethodaswellasintegralmasterplotmethod.HighlyfilledPBZat75wt%ofwoodflourpreparedasreportedinourpreviousworkcl]wasemployedforthekineticstudyofitsthermaldegradationbehavior.Theweightlossofsamplesasfunctiontemperatureusingnon-isothermalthermogravimetricanalyzer(TGA)modelTGA/SDTA85lefrom300Ct09000Catthreedifferentheatingratesof5,10,and200C.min-lunderaconstantflowofnitrogenat100mlmin-lwasobtainedandanalyzed.ThePBZwoodcompositeexhibitedfourstagesofthermaldegradationprocesseswhileonlythreestageswereobservedforthethermaldegradationprocessesofthePBZmatrixandthewoodflourfiller.ThevaluesofthePBZwoodcompositeEaandAwere146-199kJ.mol-land1.86X10lo一4.88X10lomin-l,respectively.Furthermore,thedegradationreactionmechanismexaminedbyintegralmasterplotmethodofalldegradationstagesofthecompositewasfoundtoberandomnucleationandsubsequentgrowth(Fi).AmultistagethermaldegradationofthePBZwoodcompositewasobserved.Theactivationenergyofeachdegradationstagewascalculatedbydistributedactivationenergymodel.Fromtheaboveanalysis,thenon-isothermaldegradationkineticofthecompositewasbestdescribedbykineticequationsofnth-orderi.e.Fnmechanism.
作者: C. Jubsilp , N. Arttawang, S. Mo-od , S. Rimdusit
上傳時(shí)間: 2013-06-28 16:13:03
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消耗積分: 2  
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