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High Mechanical Performance of Layered Graphene Oxide/Poly( vinyl alcohol) Nanocomposite Films  
High Mechanical Performance of Layered Graphene Oxide/Poly( vinyl alcohol) Nanocomposite Films
资料类型: PDF文件
关键词: Graphene  oxide  Nanocomposites  Hydrogen-bonding  Strength  Toughnes  
资料大小: 73K
所属学科: 通用高分子材料
来源: 来源网络
简介:
Thedesignandfabricationofstrong,lightweight,anddamage-resistantcompositematerialsaremajortopicsofstudiesoncomposite.Biomimetics,adevelopingmultidisciplinaryfield,isnowleadingthefabricationofnovelmaterialswithremarkablemechanicalproperties.Grapheneoxide(GO),agraphenederivate,possessesgoodmechanicalproperty,highaspectratio,andgoodsolubilityinaqueoussolution,indicatinggreatpotentialinnanocompositefields.Inthiswork,bio-inspiredlayeredGO/pol(vinylalcohol)(PVA)nanocompositefilmswithremarkablemechanicalperformancewerepreparedbyanenvironmentalfriendly,bottom-upassemblymethodology.ThestructuralanalysisshowsthealternatepileofinorganicGOplateletsandorganicPVAbinder.Tensiletestsindicatethattheborate-treatedGO/PVAnanocompositefilmsdisplay360MPaofstrength,whichistwofoldtothreefoldhigherthanthatofbiologicalmaterials(e.g.,nacre).ToughnessofGO/PVAnanocompositesisalsoenhancedtofourfoldcomparedwithnacre.Torevealthetougheningfunctionoftheintercalatedpolymerinthenanocomposites,theinfluenceofpolymerwithvariedmolecularweights(Mw‘s)onthefracturemodeofthenanocompositeswassystematicallyinvestigatedthroughquasi-statictensileandcreeptests.ThePVAmoleculeswithhighMwcanconnectmoreneighboringGOplateletsthroughinter-andintra-linkagesthanthosewithlowerMw,whichresultinginefficientstresstransferalongtheGOplanedirection.Thus,tensilestrengthandtoughnessimproved.Thisworkillustratesthefunctionsofbondingtypesbetweeninorganic-organicphasesandintercalatedpolymerwithdifferentMw,sonthemechanicalpropertiesofthelayerednanocomposites,includingstiffness,strength,andtoughness.
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