最新[理学]《聚合反应原理专论》 chapter 7 中科大研究生教学课件ppt课件.ppt

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1、[理学]《聚合反应原理专论》chapter7中科大研究生教学课件6-1introduction1.ConceptofnonlinearpolymerandblockcopolymersNecessaryofstudyingblockcopolymerandnonlinearpolymersIntensecommercialandacademicinterestsinblockcopolymers.Commercialinterests:thermoplasticelastomers,toughplastics,compatibilizingage

2、ntsforpolymerblends,polymermicelles,etc.b.Academicinterests:theeffectsofthermodynamicincompatibilityofthetwo(ormore)componentsonpropertiesinbulkandsolution.2.Thesynthesisandpropertiesofnonlinearblockcopolymerswithemphasisonsyntheticaspects.AnotherexampleisIonicstarblockcopoly

3、mershavingthreearmsandshortionicouterblocksweresynthesized.4-armedstarblockcopolymersThesterichindranceofabulkypolystyryllithiumreactiveendsstronglyfavortheformationofcoupleproductsratherthanstarsunderthereactionconditions.sterichindrance(2)Cationicpolymerizationa.Divinylethe

4、rmethod.ThismethodissimilartoDVBmethodinanionicpolymerizationHydrolysisoftheproductproducesahydrophiliccore.(b)Multi-functionalinitiatorTri-functionalcationicpolymerizationinitiator,derivedfromtricumylchlorideisusedtoprepare3-armstarblockcopolymerswithpolyisobutyleneinnerbloc

5、ksandPSouterblock.Titaniumchlorideasco-initiator,andpyridineasanelectrondonor.Duetochaintransferreactions,theadditiontimeofthesecondmonomer(St)intothereactionmixtureisofcrucialimportance.3-armamphiphilicstarblockcopolymerHydrolysisoftheestergroupsgavethe3-armstaramphiphilicbl

6、ockcopolymerwithnarrowMWDandexactarmnumberwiththenumberofinitiationsites.Threearmstarblockcopolymersc.CouplingmethodTheproductoflinkingreactionhadnarrowMWDand4arms.偶联剂：(3)MacromonomertechnologyTheblockcopolymerspreparedbythismethodexhibitlargevariationsinmolecularweightandnum

7、berofarms,butthearmnumbercannotbecontrolled.6-2-2Graftcopolymers1.Basicconceptofgraftcopolymersa.Thegraftcopolymersarecomposedofamainpolymerchaintowhichoneormoresidechainsareconnectedthroughcovalentbonds.b.Thebranchesarerandomlydistributedalongthebackbone.2.Threegeneralmethod

8、sforthepreparationofgraftcopolymersGraftingontoGraftingfromGraftingt