纳米复合材料概述ppt课件.ppt

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1、TheResearchandApplicationofPolymer／Organophilic-MMTnanocompositesInsituteofNanoandBio-PolymericMaterialsTongJiUniversityProf.RenJie1.IntroductionThedefinitionandhistotyofnanocompositesMillionsofyearsago,thenaturalnanocomposites,suchasbornandshell.Recently10years,scientistsb

2、egantoknowhowtopreparenanocompositesandhowtousethemineverydaylife.Nanocompositesarethefourthgenerationofmaterialsaftersingle-phasematerials,compositesandgradientmaterials1984,RoyandKomarneni,Nanocompositesshouldbecompoundedinnanometricsize(1-100nm)inmorethanoneorientation2.

3、ThemainmethodsofthepreparationofPolymer-Organophilicnanocomposites1.sol-gel2.blend3.in-situpolymerization4.intercalation5.self-assemblyandassemblyofmolecules6.synthesisofirradiation2.ThemainmethodsofthepreparationofPolymer-Organophilicnanocomposites1．sol-gelDirectinsertiono

4、fsoluablepolymerintoinorganicnetworktheprecursordissolvedinthepolymersolutionishydrolyzedandformsthehalf-interpenetratingnetwork2.ThemainmethodsofthepreparationofPolymer-Organophilicnanocompositesinorganicphaseisintroducedinthesideofthepolymerorintheendofthebackbone。1．sol-g

5、elb)Covalentbondingbetweenpolymerandnano-phase2.ThemainmethodsofthepreparationofPolymer-Organophilicnanocomposites1.sol-gelTheaddedmonomersarepolymerizedwhentheprecursorishydrolyzed–condensed,thentheorganic-inorganicinterpenetratingnetworkcanbeobtainedc)Organic-inorganicint

6、erpenetratingnetwork2.ThemainmethodsofthepreparationofPolymer-Organophilicnanocomposites1．sol-gelFeatures:thesol-gelprocessisoneundermildconditions,andtheproductsareobtainedwithgoodsize-distribution.。shortages：theshrinkingstressresultedfromtheevaporationofsolvent,sothatmono

7、merandwatercaninfluencethemechanicalpropertycosolventisoftenused,sol-gelprocessissubjecttothesolubilityofpolymer3.preparationoftheprecursorisverycomplex,whichisoftenexpensiveandtoxic.2.ThemainmethodsofthepreparationofPolymer-Organophilicnanocomposites首先制备纳米粒子，然后与聚合物共混a)溶液共混

8、b)乳液共混c)熔融共混缺点：纳米粒子易团聚，均匀分散困难2．blend二、纳米复合材料的主要制备方法单体溶液↘超声波分散中分散——〉或（并）——〉单体聚合纳米粒子