摘要
Thecompositiondistribution（CD）andmicroisotacticitydistribution（ID）ofpropene/1-hexenecopolymersynthesizedbyMgCl2/DIBP/TiCl4（DIBP:diisobutylphthalate）weredeterminedbyfractionatingthecopolymersaccordingtocrystallinityandcharacterizingthefractionsby13CNMR.Theeffectsoftwoalkoxysilanedonors,triethoxyphenylsilane（PTES）anddimethoxydi-tert-butylsilane（TBMS）,onCDandIDofthecopolymrswerecompared.ThreemainpartsintheCDdiagramofeachcopolymerweredistinguished,whichwerecorrelatedtoactivecenterdistribution（ACD）basedonthreegroupeofdif-ferentactivecenters.Bystudyingthechangesin1-hexenecontent,microisotacticityandreactivityratioproductofthreetypicalfractions,theeffectsofexternaldonoronACDwerebetterelucidated.ItwasfoundthatTBMSshowsmuchstrongereffectsonACDthanPTES.Intheformersystem,mostfractionswereproducedonactivecenterswithrelativelylowerr1r2,higherreactivityto1-hexene,andhigherstereospecificityascomparedtothesystemwithoutexternaldonor.ItisconcludedthattheobservedveryextensivechangesinACDaremainlyresultedbytheformationofnewtypesofactivecenters,possiblybycoordinationofexternaldonortocertainpositionsonthecatalyst.
出版日期
1997年03月13日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
