成核剂对PET的结晶改性研究

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1、上海交通大学硕士学位论文成核剂对PET的结晶改性研究姓名：罗双菊申请学位级别：硕士专业：材料学指导教师：孙康;江学良20060201上海交通大学硕士论文摘要综合考虑三种成核剂对PET结晶性能和力学性能的影响从实际应用角度我们认为这三种成核剂中离子聚合物Surlyn是PET的最佳成核剂并且随着Surlyn含量的增加先是促进了PET的结晶当Surlyn的含量达到35时PET的成核效果最好而当Surlyn含量进一步增加时PET的结晶反而被抑制而从力学性能方面考虑得到加入Surlyn为3时力学性能最好关键词PET成核剂DSC结晶动力学结晶结构II上海交通大学硕士论文摘要Thestudyofthe

2、EffectofNucleatingAgentsonCrystallizationModificationofPETAbstractThepaperstudiedtheeffectofdifferentkindsofnucleatingagentssuchastalc,ionomerSurlynandsodiumbenzoateonthecrystallizationbehaviors,crystallizationkinetics,crystalstructureandmechanicalpropertyofpolyethyleneterephthalate(PET).Thenon-c

3、rystallizationkineticsandcrystallizationkineticsofPETwerestudiedbyOzawaequationandAvramiequation,Hoffmantheory,respectively.ThemorphologyandstructureofpurePETandPET/nucleatingagentblendswasinvestigatedbyPolarizingOpticalMicroscope(POM)andXRayDiffraction(XRD).Theeffectofthethreekindsofnucleatingag

4、entsonmechanicalpropertyofPETwascompared.AccordingtoDSCandanalysisofthecrystallizationkinetics,forPET,thetemperatureofcoolingcrystallizationTccdecreasedandthetemperatureofheatingcrystallizationTmcincreasedafterthethreekindsofnucleatingagentsaddedin,whilethecrystallizationrateKdistinctlyincreased.

5、ThefoldsurfacefreeenergyóecalculatedbyHoffman-Lauritzentheory.TheresultsindicatedthatthethreekindsofnucleatingagentsincreasedthecrystallizationrateconstantthroughpromotingtheirIII上海交通大学硕士论文摘要nucleatingeffectforPETcrystallization,amongwhichSodiumbenzoatewasthebestone,whileSurlynwasslightlybetterth

6、antalc.ThethreekindsofnucleatingagentsdidnotchangethecrystallizationstructureofPET.Troughthetestingandanalysisofmechanicalproperty,talcandSurlynalsoimprovedthetensilestrengthandflexuralstrength,whileaddedinsaltsodium,thetensilestrengthandflexuralstrengthdistinctlydecreased.Combinedthecrystallizat

7、ionpropertyandmechanicalproperty,wethoughtionomerSurlyninthethreekindsofnucleatingagentsasthebestnucleatingagentofPET.Furthermore,westudiedtheeffectofthecontentofSurlynonthecrystallizationpropertyandmechanicalpropertyo