Syntheses of Multi-stereoblock Polybutene-1 with Novel Mono-cyclopentadienyltitanium/Modified Methylaluminoxane Catalyst

Abstract

Abstract: 1-Butene was polymerized using novel mono-(η⁵-pentamethylcyclopentadienyl) tribenzyloxy titanium Cp^*Ti(OBz)₃/modified methylaluminoxane(mMAO)as catalyst. The resulting multi stereoblock polybutene-1 was characterized by ¹³CNMR and DSC analysis. The influences of various oxidation state of titanium active species on₁butene polymerization were investigated. It was indicated that Ti(Ⅳ) active species is in favour of producing polybutene-1.¹³CNMR analyses of polymers obtained show that propagation of 1-butene involves primarily head to tail 1,2-insertions, with involving some head to head or tial to tail 2,1-misinsertions. There is a remarkable decrease in 2,1-misinsertions with decreasing temperature of polymerization. Regiopentad distribution indicates stereoblock polybutene-1 with melting temperature(T_m) comprising isotactic, syndiotactic and atactic multi sequences polybutene-1.

Key words: Metallocene, Methylaluminoxane, Polybutylene-1

CLC Number:

O631.1

TrendMD:

ZHU Fang-Ming, HUANG Qi-Gu, HUANG Dong-Dong, WU Qing, LIN Shang-An . Syntheses of Multi-stereoblock Polybutene-1 with Novel Mono-cyclopentadienyltitanium/Modified Methylaluminoxane Catalyst[J]. Chem. J. Chinese Universities, 1999, 20(7): 1156.

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Syntheses of Multi-stereoblock Polybutene-1 with Novel Mono-cyclopentadienyltitanium/Modified Methylaluminoxane Catalyst

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