茂金屬催化苯乙烯間規(guī)聚合過程研究

1、浙江大學(xué)碩士學(xué)位論文茂金屬催化苯乙烯間規(guī)聚合過程研究姓名：栗偉申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：化學(xué)工藝指導(dǎo)教師：李伯耿曹堃2002.3.1浙江大學(xué)碩士學(xué)位論文AbstractSyndiotacticpolystyrene(sPS)isanewtypeofthermoplasticsRecentlyitbecomesfocusofresearchforitsexcellentpropertiesInthethesis，ahomogenousmet

2、allocenecatalystsystemCpTiX3／MAO／TIBAwasusedtopreparethesyndiotacficpolymerThekineticsofthesolutionpolymerizationprocess，theparticlemorphologyoftheproducedsPS，andtherheologyofthesPSsuspensionwerestudiedAseededsemi—contin

3、uouspolymerizationprocesswasinvestigatedalsoThestyrenesyndiotacticsolutionpolymerizationwerecarriedoutrespectiveinthepresenceofchlorobenzene，tolune，heptane，isooctane，naphthaneandmixedsolventTheresultsdemonstratethateleva

4、tingthepolymerizationtemperatureandagitationspeed，reducingpolarityofsolventorusingnonsolventforamorphouspolystyrenearebeneficialtopolymerizationandraisemonomerconversionAndthemolecularweightofproducedpolymerisincreasedwi

5、thdecreaseintemperatureandsolventpolarityandwithanincreaseinagitationrateTheinvestigationoncrystallizationkineticsofnascentsPSshowsthatthecrystalofnascentsPSfromsolutionpolymerizationisin6typeanddoesnotchangewithvarietyo

6、fsolventThedataofparticlesizeandparticlesizedistributionsoftheproducedpolymerduringthepolymerizationindicatesthatelevatingpolymerizationtemperatureandagitationspeed，andusingisooctaneornaphthanetobesolventwillimprovethemo

7、rphologyofnascentparticlesByinvestigatingtherheologyofsPSsuspension，wefoundthatthesPSchlorobenzenesuspensionhasNewtonianfluidpropertieswhenthepolymercontentislowerthan10％ButsuspensionwillbeshearthinnedandturnintotheNon—N

8、ewtonianfluidwithanincreaseinthesPScontentWhenthesolidcontentiSrelativehigh，temperaturerisingwilldecreaseshearstressandapparentviscosityHoweverwhenthesuspensionispreparedbyanonsolventforamorphouspolystyrene，suchasheptane