mbt shoes sale Single-titanocene catalysts for syn

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Single-titanocene catalysts for syndiotactic polymerization of styrene and ethylene polymerization compared

iharaN. KuntrnoloTM. U0M. Maeromoletad ~. 1988.21:356 ~ 360R boat ∞ L, Bo S. Commerce ALMacv0rnoIectd ~,[link widoczny dla zalogowanych], L990 ,[link widoczny dla zalogowanych],23:4489 - 4492ZhuF unload the L (ZHU Fangming), Fangyutang (Fang Yutang), Lins} lang ugly n (Shangan) AztaScientiarumN and tur & IjnUniver ~ itatisSunyats ~ mi (Sun Yat-sen University (Natural Science Du) .) 1998,5:43 ~ 48ChienJCW. gedeoekS. SizhongDongM ugly clen Shu. 1992.25:3199 ~ 3205l2345671 of Fangyu Tang et al: Single-titanocene catalysts for syndiotactic polymerization of styrene and ethylene polymer platform comparison STUDIES0NSYND10SPECIFlCPoLYMERIZAT10N0lFSTYRENEANDP0LYM 【ERIZAT10N0lFETH Ⅵ ENEW List N0VELTITANoCENECATALYSTFANGYutang, ZHUFangming, WANGQunfang,[link widoczny dla zalogowanych], LINShanganfInstituteA coffee port SHence, z when dUnit ~ sity, Guangzhou510275 ) AbstractSyndiotaeticpolystyrene (sPS) andpolyethylenewerecomparativelysynthesizedwithhomogeneouscatalyticsystemscomposingr/5-pentamethyeyclopantadienyltrihenzyloxytitanium [cpTl (OBz) 3] andvariousmodifiedmethylaluminoxanes (mMAO). ThecontentofTMAinmMAOc ugly nhecontrolledbyregulatingO/TMAmolarratioduringthepreparationofmMAObypartialhydrolysisofTMAwithAl2 (sO4) 3't8H2O. TheeffectofA1/Timolarratioonpolymerizationofstyreneaswellasethylenehavebeenstudiedindetail. Theoxidationstates0ftitaniuminCpTi (0Bz) / MAOcatalyticsystemsweredeterminedbyredoxtitrationmethod. Itseemsthatactivecentre0fTi (Ⅲ) isfavorableforstyrenesyndlospacificpolymerizationwithhighercatalyticactivity, whileTi (1g) centeris [avorahleforethylenepolymerization. Thestyrenesyndiospecificpolymerizationmayalsoheinfluencedbytheexternaladditionoftri-isohutyl-aluminum (TIBA) intothesamecatalyticsistemgivinghigheryieldhutslightlylowermolecularweightofsPS. KeywordsTitanocenecatalyst,[link widoczny dla zalogowanych], Methylaluminoxane, Styrenesyndiospeeificpolymerization, Ethlyenepolymerization
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