Metallocene Catalysts for Syndiospecific Polymerization of Styrene

Abstract

Abstract: Syndiotactic polystyrene was synthesised with metallocene catalysts activated bymethylaluminoxane(MAO) and trimethylaluminum (TMA).The catalytic efficlency (C.E.)for syndiospecific styrene polymerization was compared with different η⁵-cyclopentadi-enyltrialkoxy titanium [CpTi (OR)₃].η⁵-Cyclopentadienyltripropoxy titanium [CpTi (O-n-Pr)₃]/MAO/TMAcatalyst has a exceedingly high value of C.E.=4 × 10⁴ g PS.(g Ti)^-1.The catalytic efficiency of the catalyst and the molecular weight and syndiospecificity ofpolystyrene were affected by catalyst composition and concentration, monomer concentra-tion, polymerization temperature and time.The optlum conditions of polymerization ofstyrene for [CpTi(O-n-Pr)₃]/MAO/TMAcatalyst are Al/Ti (molar ratio)=1000, tempera-ture about 60 C, high styrene concentration (>2.4 mol/L) and c(Ti)=0.14 mmol/Lformaximum activity or c(Ti)=O.18 mmol/Lfor maximum yield- The sPSwas separated frompolymerization product by extraction with boiling butanone for 8 h, the yield of sPSover95 %.

Key words: Syndiotactic polystyrene, Methylaluminoxane, Syndiospecific polymerization ofstyrene, Metallocene catalyst

CLC Number:

O630.1

TrendMD:

ZHU Fang-Ming, LIN Shang-An. Metallocene Catalysts for Syndiospecific Polymerization of Styrene[J]. Chem. J. Chinese Universities, 1997, 18(12): 2065.

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Metallocene Catalysts for Syndiospecific Polymerization of Styrene

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