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cis ‐Specific Living Polymerization of 1,3‐Butadiene with CoCl 2 and Methylaluminoxane
Author(s) -
Nath Dilip Chandra Deb,
Shiono Takeshi,
Ikeda Tomiki
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20020301)203:4<756::aid-macp756>3.0.co;2-k
Subject(s) - methylaluminoxane , polymerization , polymer , polymer chemistry , molar mass distribution , chain transfer , materials science , coordination polymerization , chemistry , solution polymerization , metallocene , radical polymerization , composite material
The polymerization of 1,3‐butadiene was conducted by CoCl 2 combined with methylaluminoxane (MAO) as a cocatalyst at 0 and 18°C. The uni‐modal molecular weight distribution curves of the resulting polymers shifted toward higher molecular weight regions and became narrower when increasing the polymerization time. The number‐average molecular weight increased linearly with polymerization time, while the polymer yield increased exponentially in the initial stage. As a consequence, the number of polymer chains, calculated from the polymer yield and M̄ n , increased gradually with polymerization time to reach a plateau value. These phenomena was interpreted based on a slow initiation system without any termination and chain transfer reaction. The microstructure of the polymer was determined by 1 H NMR and 13 C NMR spectroscopy to be a cis ‐1,4 structure in a 98–99% purity.