亞濃-濃溶液中纏繞著的線型高分子鏈透過多孔膜的擴散.pdf

1、霉i≯一卡瓣i||聾嗜參棗一『|羲擎umve。燃。YO撼FSC!il!黲擎AN麟n，E曛曛No。纛GY2塑基襄H‘H^博士學位論文論文題目堊盜』盜渣遮主堡壘董魚垡型盞坌至焦堡過多孔膜的擴散作者姓名學科專業(yè)導師姓名完成時間二oO七年四月中國科學技術大學博士學位論文AbstractThediffusionoflinearpolymerchainsthroughaporousmembraneisimportantforgelpermeatio

2、nchromatography，ultrafiltration，controlledreleasingandtmnslocationofbiologicalmacromoleculesWehavesynthesizedsmallsphericalcoreshellparticleswithacoremadeoflinearnoncrosslinkedpolystyrene(PS)chainsandaCrosslinkedpolystyr

3、eneshellbytheseededemulsionpolymerizationTheseparticlescarlberedispersedandswolleninanathemalsolventandusedasnovelsystemtostudythediffusionofpolymerchainsthroughaporousmembraneUsingacombinationofstaticanddynamiclaserligh

4、tscatteringtomonitorthechangeoftheaveragemolarmassoftheseparticlesviathescatteringintensitywehaveexaminedthediffusionOUtoflinearPSchainsfromthegorethroughtheporousshellOurmainfindingsare∞followsUsingacombinationofdiffere

5、ntemulsionpolymerizationmethods“nloreemulsionpolymerization，suffaetantfreeemulsionpolymerizationandnormalemulsionpolymerization)，wehavesynthesizeddifferentnarrowlydistributedPSparticleswithadiameterintherange00510pmTheir

6、sizedistributionsinwaterandindrystatehavebeencharacterizedbylaserlightscattering(LLS)andtransmissionelectronmicroscopy(TEM)ThedistributionsofthesePSparticlesaresonarrowthattheycallbeusedasparticlestandardsUsingthesenarro

7、wlydistributedPSparticlesastheseeds(core)，WeWereabletoencapsulatelonglinearPSchains(core)insideathinlayerofcrosslinkedPSchains(shell)bytheseededemulsionpolymerizationinwaterunderstarvedconditionSuchcore—shellparticlesCan

8、bedriedandredispersed／swolleninallathermalsolvent(toluene)UsingthesesmallCOreshellparticlestostudythediffusion。wegaintwoadvantages：namely，1)theyhaveahugesurfaceareaSOthatthediffusioncaIlreachitsequilibriumwithinareasonab

9、letime，and2)wecalluseLLStofoilowthediffusionoutoflinearPSchainsinsidethecorethroughtheporousshellwithoutanyinterferenceWehavesynthesizedsmallsphericalcoreshellparticleswithdifferentshellthicknesses，butthesamecore，tostudy