纳米材料英文介绍.pptx
Definition of NanocompositesCharacteristics of NanocompositesDifferences between Traditional composites and NanocompositesAdvantages of nanocompositesApplications of nanocompositesOutline第1页/共10页Definition of NanocompositesComposites with nanometer-scale reinforcementsPolymer nanocomposites(PNC)are polymers(thermoplastic,thermosetting or elastic)that have been reinforced with small quantities(less than 5%by weight)of nano-sized particles having high aspect ratios(L/h300)Nanocomposites are not necessarily superior to conventional composites第2页/共10页Characteristics of NanocompositesMechanical Properties -Improvements in stiffness for all polymers -Reductions in strength and fracture toughness(except some elastomeric polymers)Dimensional Stability -Lower CTE,higher Tg&heat distortion temperatureFlame Retardant Properties -Lower heat release rate&lower mass loss rateGas/Moisture Barrier Characteristics -Lower permeability and diffusivity第3页/共10页Traditional composites:Micro-scaled fillers Interface of fillers close to the bulk polymer Nanocomposites:Nano-scaled fillers Ultra-large interfacial area per volume Distances between the polymer and filler components are extremely short -Comparable dimensions of polymer coils(40nm in diameter)and nanoparticles molecular interaction between the polymer and the nanoparticles unusual material properties of nanocomposites.Differences between Traditional composites and Nanocomposites第4页/共10页Advantages&benefits of Nanocomposites Mechanical-related properties High specific stiffness and strength Enhanced toughness Enhanced fatigue an creep resistance Better damage tolerance Physical-related properties Controlled thermal expansion and conductivity Directional electrical and magnetic properties Better elevated temperature behaviour Chemical-related properties Enhanced corrosion and degradation resistance第5页/共10页Applications of nanocomposites Automobiles:-Air intake cover,fuel tank and other under the hood components due to the improved mechanical and thermal stability第6页/共10页 Enhancement of elastomeric properties:人造橡胶图片-for oil resistant HNBR（氢化丁腈橡胶）by the inclusion of Zinc（锌）di-methacrylate第7页/共10页 Thermal insulating coatings:-a layer of nanoporous(纳米多孔)silica（硅）on PI（聚酰亚胺）thin film coated by a 70nm thick Al films Flammability reduction:-layered silicates in PP and PS第8页/共10页With the rapid development of society and economy,nanocomposites will be regarded as an important and valuable direction for material research,we believe it will has a clear future.Thank you for your watchingSummary第9页/共10页感谢您的观看！第10页/共10页
