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基于热重分析和热裂解气相色谱-质谱联用法的液晶聚合物热裂解成分检测.docx

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基于热重分析和热裂解气相色谱-质谱联用法的液晶聚合物热裂解成分检测 Title:IdentificationofLiquidCrystalPolymerDecompositionComponentsusingThermogravimetricAnalysisandPyrolysisGasChromatography-MassSpectrometryHyphenation Abstract: Liquidcrystalpolymers(LCPs)areaclassofhigh-performancematerialswidelyusedinvariousapplications,includingelectronicdisplays,opticaldevices,andaerospaceindustries.UnderstandingthethermaldecompositionbehaviorandidentificationofdecompositionproductsarecrucialforthesafeandefficientutilizationofLCPs.Inthisstudy,acombinationofthermogravimetricanalysis(TGA)andpyrolysisgaschromatography-massspectrometry(Py-GC-MS)wasemployedtoinvestigatethethermaldecompositioncomponentsofLCPs. Introduction: Liquidcrystalpolymers(LCPs)exhibituniquepropertiessuchaslowshrinkage,highthermalstability,andexcellentmechanicalstrength,makingthemattractivematerialsformanyapplications.However,duringprocessingorundercertainoperatingconditions,LCPscandecompose,leadingtopotentialdegradationofperformanceandevensafetyhazards.Therefore,itisnecessarytounderstandthedecompositionbehaviorofLCPsandidentifythedecompositionproducts. Methods: Inthisstudy,commerciallyavailableLCPsampleswereanalyzedusingathermogravimetricanalyzer(TGA)coupledwithapyrolysisgaschromatography-massspectrometry(Py-GC-MS)system.TGAwasusedtoinvestigatetheweightlossanddecompositiontemperaturerangesoftheLCPsamplesundercontrolledheatingconditions.Py-GC-MS,whichcombinessamplepyrolysisandgaschromatography-massspectrometry,wasappliedtoanalyzethecompositionofthedecompositionproducts. Results: TheTGAcurvesoftheLCPsamplesexhibitedmulti-stepdecompositionprofiles,indicatingthatthedecompositionprocessoccurredinmultiplestages.Theinitialweightlosswasattributedtotheevaporationofvolatilecomponents,followedbythemaindecompositionstep,andfinallytheresidualashformation.Thetemperatureregionscorrespondingtoeachstagewereidentified. Py-GC-MSanalysisoftheLCPdecompositionproductsrevealedacomplexmixtureofvolatilecompounds.Thechromatographicseparationenabledtheidentificationofi