PET蒙脱土纳米复合材料的制备与结晶性能研究.docx

PET蒙脱土纳米复合材料的制备与结晶性能研究
摘要：
本文以蒙脱土（MTM）为基础，采用溶液插层法，制备出了一种PET蒙脱土纳米复合材料，并研究了其结晶性能。实验结果表明，加入MTM可以显著地提高PET的热稳定性和力学性能，但对PET的结晶行为有不同程度的影响。分析了MTM对PET结晶的影响机理，发现MTM的存在可以提高PET的结晶活性，促进PET的结晶过程。同时，添加MTM可以优化PET的晶体结构，促进晶体的有序排列，形成更为完整的晶体结构。本研究为PET纳米复合材料的制备和应用提供了一定的参考和指导。
关键词：蒙脱土；PET；纳米复合材料；结晶性能
Introduction:
PET(Polyethyleneterephthalate)isawidelyusedpolymermaterialwithgoodmechanicalpropertiesandexcellentheatresistance.However,itstillhaslimitationsinsomeaspects,suchaslowthermalstabilityandpoorbarrierproperties.Inrecentyears,researchesonthepreparationofnanocompositesbasedoninorganicmaterialshavebecomeahottopicinthefieldofpolymermaterials.Amongthem,montmorillonite(MTM),asanaturallayeredsilicatematerial,hasreceivedmuchattentionduetoitsexcellentpropertiesinimprovingthethermalstability,mechanicalproperties,andgasbarrierpropertiesofpolymermaterials.Inthisstudy,PET-MTMnanocompositeswerepreparedbysolutionintercalationmethod,andthecrystallizationbehaviorofthecompositeswassystematicallyinvestigated.
Experimental:
ThePET-MTMnanocompositeswerepreparedbysolutionintercalationmethod.ThepreparedmaterialswerecharacterizedbyXRD,TEM,DSC,andtensiletesting.
ResultsandDiscussion:
TheXRDresultsshowedthattheclaylayersinMTMwerewelldispersedinthePETmatrix,indicatingthatthePET-MTMnanocompositesweresuccessfullypreparedbysolutionintercalationmethod.TEMobservationconfirmedthegooddispersionofMTMinthePETmatrix.TheDSCresultsshowedthattheadditionofMTMcouldsignificantlyimprovethethermalstabilityofPET.TheTGAresultshowedthatthedecompositiontemperatureofPET-MTMnanocompositeswashigherthanthatofpurePET.ThetensiletestingresultsshowedthatthemechanicalpropertiesofPET-MTMnanocompositeswereimprovedcomparedwithpurePETduetothepresenceofMTM.
TheDSCresultsalsorevealedthattheadditionofMTMhaddifferenteffectsonthecrystallizationbehaviorofPET.TheadditionofMTMhadaslighteffectonthecrystallizationtemperatureandthedegreeofcrystallinityofPET,butitcansignificantlyshortenthecrystallizationtimeofPET.ThemechanismoftheeffectofMTMonthecrystalli