雙核鈦茂金屬催化甲基丙烯酸甲酯本體聚合研究.pdf

1、浙江大學(xué)碩士學(xué)位論文雙核鈦茂金屬催化甲基丙烯酸甲酯本體聚合研究姓名：郎五可申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：工業(yè)催化指導(dǎo)教師：孫俊全20060201浙江大學(xué)碩士學(xué)位論文AbstractMetallocenecatalystisahi曲qualityolefincatalystdevelopedfromconventionalZiegler—NattacatalystComparedwiththeconventionalZieglerNattaca

2、talyst，homogeneouspolymerization，higheractivityandnarrowermolecularwet曲tdistributionmakeitmuchmoreoutstandingHoweverthenarrowmolecularweighdistributioninducesfollowingindustrialprocessdifficultInordertobroardenthemolecul

3、arweiightdistributionofmetalloenepolymer，dinuclearmetallocenehasbeendevelopedfromtheideathattwometalcentersandtheirinteractionmayproducetwoormorecatalyticcentersManydinuclearmetalloceneshavebeensynthesizedandusedforolefi

4、npolymeriazationandobtainedbroadorbimodalmolecularweightdistributionpolymersInthispaperfournoveldinucleartitanocenesA，B，C，Dweresynthesizedandusedforthebulkpolymerizationofmethylmethacrylate(MMA)incombinationwithcocatalys

5、tAl(iBu)3Thesefourcatalystscanbedividedintotwogroupsbasedontheirstructure：A／AI(iBu)3andB／AI(iBu)aformthesymmetrydinucleartitanocenegroup，C／AI(iBu)3andD／AI(iBu)3formtheasymmetrydinucleartitanocenegroupEachgroupwasstudiedi

6、ndetailsandobtainedthefollowingresultsTothesymmetrydinucleartitanocenegroup：Underthepolymerizationcondition(MMA／Cat=2000，Al／Cat=20，60。C，15h)ofALAI(iBu)3catalyticsystem，theconversionofMMAreached5480％，MnofPMMAwas340000arou

7、nd，molecularwetgllfdistributionofPMMAwas168，syndiotacticcontentofPMMAwasabout68％Underthepolymerizationcondition(MMA／Cat=1500，Al／Cat=10，60“C，15h)ofB／AI(iBu)3catalyticsystem，theconversionofMMAreached8721％，M。ofPMMAwasabout6

8、0000，molecularweightdistributionofPMMAwas784，syndiotacticcontentofPMMAwasabout76％Comparedtheresultsoftheabovetwocatalyticsystems，itisclearthatA／AI(iBu)3catalyticsystemhadloweractivityandobtainedPMMAwithhighermolecularweJ