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1、SfSynthesisofPolymerNanocompositesMECH548DepartmentofMechanicalEngineeringHongKongUniversityofScience&Technology1Outline•CompatibilitybetweenFillerandPolymers:KeyConsiderationsforPolymerMatrixSeSeectolection•MajorPolymerMatrixSystems•SynthesisofNanocomposites•Functionalizati
2、onofNano-fillers•SypynthesisExamplesofNanocompposites:–Clay-based–CarbonNanotube-based–GraphiteNanoplatelet-based•Summary21CompatibilitybetweenFillerandPolymers3KeyConsiderationsforPolymerMatrixSelectioninNanocompositesTargetingtouniformlydisperseanddistributethenanothenano-
3、sizedreinforcementssizedreinforcementswithinthewithinthepolymermatrix,weneedtounderstand/determine:1.Interfacialinteractionand/orcompatibilitybetweentheidentifiednanoparticlesandpolymermatrix.2.Requiredprocessingtechniquetouniformlydisperseanddistributethenanoparticleswithin
4、thepolymer.42DesiredMulti-functionalPropertiesofNanocomposites(1/2)•Thermal–Improvedthermalresistancehigherglassthermalresistance,higherglasstransitiontemperature,reducedcoefficientofthermalexpansion,improvedthermalconductivity,etc.•Mechanical–Increasedmodulus,strength,tough
5、ness,elong,gation,etc.•Chemical–Improvedsolventresistance,improvedmoistureresistance,etc.5DesiredMulti-functionalPropertiesofNanocomposites(2/2)•Electrical–Controlledresistivity(dependingonresistivity(dependingonreinforcementalignment/directionality).•Barrier–Air/oxygen,mois
6、ture,othergasessuchashydrogen,nitrogen,solvents.•Optical–Clear/transparency.•Others–Wearresistance,reducedshrinkage.63MajorPolymerMatrixSystems7PolymerMatrices•Threebasicfamilies:thermoplastics,thermosetsandelastomers.Comparisonsofthermoplasticandthermosetresincharacteristic
7、s84ThermoplasticExamplesofthermoplasticbeingadoptedasnanocompositematrix•Extensivelyusediiinvariousapplicationssuchasinteriorpartsofautomotive,carbonatedbeveragebottles,plasticwrap.9Thermoset•UndergoesanExamplesofthermsetsbeingadoptedirreversiblechemicalasnanocompositematrix
8、reaction(i.e.polymerization/cure)toahihhighmolecularweightproduct.•Possesse
