Molecular Design of Novel Metallocene Catalysts and Styrene Syndiospecific Polymerization

Abstract

Abstract: CpTiCl₃, Cp^*TiCl₃, Cp^*Ti(OMe)₃ and Cp^*Ti(OCH₂CHCH₂)₃ were compared as styrene syndiospecific polymerization catalysts activated with methylaluminoxane(MAO) in toluene solution. G⁵-pentamethylcyclopentadienyltriallyloxy titanium Cp^*Ti(OCH₂CHCH₂)₃ /MAOis a highly active catalyst for styrene syndiospecific polymerization at 333～363 K. The influence factors of polymerization temperature and time, catalyst and styrene concentration on styrene polymerization have been studied. When the total polymerization product was extracted with boling butanone for 8 h, the insoluble fraction is over 98.7%. The syndiotactic polystyrene(sPS) obtained by extraction has high molecular weight(M_v=4.15×10⁵～2.46×10⁵) and high melting temperature(542.5～543 K) determined by DSC.

Key words: Metallocene, G⁵-Pentamethyclopentadienyltriallyloxy titanium catalyst, Methylaluminoxane, Syndiotactic polystyrene

CLC Number:

O630.1

TrendMD:

ZHU Fang-Ming, LIN Shang-An, ZHOU Wen-Le, TU Jian-Jun, CHEN De-Quan . Molecular Design of Novel Metallocene Catalysts and Styrene Syndiospecific Polymerization[J]. Chem. J. Chinese Universities, 1998, 19(11): 1844.

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Molecular Design of Novel Metallocene Catalysts and Styrene Syndiospecific Polymerization

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