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The synthesis of high molecular weight polybutene‐1 catalyzed by Cp ★ Ti(OBz) 3 /MAO
Author(s) -
Huang Qigu,
Zhu Fangming,
Wu Qing,
Lin Shangan
Publication year - 2001
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/1097-0126(200101)50:1<45::aid-pi531>3.0.co;2-s
Subject(s) - polybutene , methylaluminoxane , catalysis , molar mass distribution , polymerization , cyclopentadienyl complex , materials science , polymer chemistry , metallocene , organic chemistry , chemistry , polymer , composite material
A new stereoregular polybutene‐1 was synthesized with a novel catalyst precursor η 5 ‐pentamethyl cyclopentadienyl titanium tribenzyloxide (Cp ★ Ti(OBz) 3 ) and methylaluminoxane (MAO). The effects of polymerization conditions on the catalytic activity, molecular weight and stereoregularity of the products were investigated in detail. It was found the catalyst exhibited highest activity of 91.2 kgPB mol Ti −1 h −1 at T = 30 °C, Al/Ti = 200. The catalytic activity and molecular weight were sensitive to the Al/Ti (mole/mole), polymerization temperature; they also depended on the Ti concentration. The molecular weight of the products increased with decreasing temperature. The structure and properties of the polybutene‐1 were characterized by 13 C NMR, GPC, DSC and WAXD. The result showed the microstructure of polybutene‐1 extracted by boiling heptane was stereoregular, whereas the ether‐soluble fraction was atactic. The molecular weight of polybutene‐1 was over one million g mol −1 and its molecular weight distribution ( M w / M n ) was from 1.1 to 1.2. © 2001 Society of Chemical Industry