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Thermal properties of Poly(trimethylene terephthalate co-1,4-cyclohexylene dimethylene terephthalate) Copolyesters  
Thermal properties of Poly(trimethylene terephthalate co-1,4-cyclohexylene dimethylene terephthalate) Copolyesters
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关键词: Poly(trimethylene  terephthalate  co-1  4-cyclohexylene  dimethylene  terephthalate)  Copolyesters  
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所属学科: 性能表征
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简介:
Poly(trimethyleneterephthalate)(PTT)homopolymerandaseriesofPoly(trimethyleneterephthalateco-1,4-cyclohexylenedimethyleneterephthalate)Copolyesters(PTCT)havingintrinsicviscositiesof0.55~0.88dl/gweresynthesizedbymeltpolycondensationandcopolycondensationinthepresenceofmetalliccatalysts,withvaryingfeedratiosof1,3-propanediol(PDO)and1,4-cyclohexanedimethanol(CHDM).Practically,theCHDMcomonomercontentsinthecopolyesterswerehigherthanthoseinthefeeds.Theeffectofcyclohexanedimethylenestructureonthethermalpropertiesofthecopolyesterswereinvestigatedusingdifferentialscanningcalorimetry(DSC)andthermalgravimetricanalysis(TGA).TheexperimentalresultindicatedthatthecopolyestershavebetterthermalstabilitythanPTT.Theglasstransitiontemperatures(Tg)andmeltingtemperature(Tm)ofthecopolyestersweredifferentlyincreasedwithanincreaseintheCTcontent.However,nomeltingtemperaturewasobservedinthecopolyesterwiththeCTmolarfractionatabout35%-49%.
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