Polymerization of Propylene by Silylene- and Germylene-Bridged Group 4 Metallocenes

In order to compare with silylene-bridged group 4 metallocenes, C2 symmetric dimethylgermylene-bridged zirconocene and hafnocene dichlorides were prepared and employed as the catalyst for polymerization of propylene in combination with methylaluminoxane (MAO). Germylene-bridged metallocenes always p...

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Published inKOBUNSHI RONBUNSHU Vol. 59; no. 4; pp. 243 - 249
Main Authors YAMAZAKI, Hiroshi, KOYAMA, Mina, HATTORI, Yoshiko, NAKANO, Masato, USHIODA, Tsutomu, YAMAGUCHI, Yoshitaka, SUZUM, Noriyuki, MISE, Takaya, WAICATSUKI, Yasuo
Format Journal Article
LanguageJapanese
Published Tokyo The Society of Polymer Science, Japan 25.04.2002
Tsukiji daisan nagaoka
Subjects
Germylene Bridge
Group 4 Metallocene
Hafnocene
Isotactic Polymerization
Polymer
Propylene
Silylene Bridge
X-ray Structure
Zirconocene
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Summary:In order to compare with silylene-bridged group 4 metallocenes, C2 symmetric dimethylgermylene-bridged zirconocene and hafnocene dichlorides were prepared and employed as the catalyst for polymerization of propylene in combination with methylaluminoxane (MAO). Germylene-bridged metallocenes always produced isotactic polypropylene of higher molecular weight than that produced by silylenebridged analogues. The molecular structures of four metallocenes prepared from dimethylsilylene and germylenebis (2, 3, 5-trimethylcyclopentadienyl) were detemined by X-ray diffraction and showed no substantial differences of geometry between silylene- and germylene-bridged ones.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.59.243