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UV-curable epoxy systems containing hyperbranched polymers: Kinetics investigation by photo-DSC  
UV-curable epoxy systems containing hyperbranched polymers: Kinetics investigation by photo-DSC
资料类型: PDF文件
关键词: Epoxy  resins  Photopolymerization  Photocalorimetry  
资料大小: 451K
所属学科: 结构表征
来源: 来源网络
简介:
TheeffectofthepresenceofahyperbranchedOH-functionalizedpolymer(HBP)onthekineticsofcationicphotopolymerizationofanepoxysystemwasinvestigatedemployingtwocomplementarytechniques,photo-DSCandreal-timeFT-IRspectroscopy.Lowerratesofcross-linkingreactionsandhigherconversiondegreeswereobtainedinphoto-DSCexperimentswithrespecttoreal-timeFT-IRspectroscopy.Alimitedamount(10%wt)ofHBPinfluencedtoacertainextentthecurekineticsoftheepoxyresinfollowedbyRT-IR;afinalconversionofepoxygroupsequalto100%wasachievedbyincreasingthecontentupto20%wtTheadditionof10%wtofHBPleavesthecurekineticsoftheCEresinstudiedbyp-DSCalmostunchanged.ByincreasingtheHBPcontent,aslightlylowerreactionrateisobservedatlowerreactiontimes.ThepresenceoftheHBPproducedacontinuousdecreaseoftheTgoftheUV-curedepoxyresinbutonlymodestreductionsinitsthermo-oxidativestability.
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