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Characterization of polybutadiene produced with CoBr2(PPh3)2-based catalysts

✍ Scribed by Masaki Takeuchi; Takeshi Shiono; Kazuo Soga

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
214 KB
Volume
16
Category
Article
ISSN
1022-1336

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✦ Synopsis

Polymerization of 1,3-butadiene was conducted with the CoBr,(PPh,),(Ph: phenyl) - methylaluminoxane (MAO) and MgC1,-supported CoBr,(PPh,),-Al(CH,), catalyst systems. The microstructure of polybutadiene was analyzed in detail by 13C NMR spectroscopy after hydrogenation, which indicated that the distribution of the 1,2 and 1,4 units in polybutadiene is more random when the homogeneous CoBr,(PPh,), -MA0 catalyst was used. The microstructure of these polymers was compared with that obtained using BuLi as catalyst.

πŸ“œ SIMILAR VOLUMES

Structure of chain-ends in polybutadiene
Structure of chain-ends in polybutadiene produced with the CoBr2(PPh3)2/MgCl2/SiPh2(OCH3)2-Al(CH3)3 catalyst system
✍ Masaki Takeuchi; Takeshi Shiono; Kazuo Soga πŸ“‚ Article πŸ“… 1995 πŸ› John Wiley and Sons 🌐 English βš– 266 KB

## Abstract Polymerization of 1,3‐butadiene with the CoBr~2~(PPh~3~)~2~/MgCl~2~/SiPh~2~(OCH~3~)~2~‐Al(CH~3~)~3~ catalyst system was conducted in the presence of ethylene. It was found that addition of ethylene causes a marked decrease in the molecular weight of polybutadiene although ethylene is no