Solvent effect on cis-1,4-specific polymerization of 1,3-butadiene with CoCl2(PRPh2)2–EASC catalytic systems

Highly active and stereospecific polymerization of 1,3-butadiene catalyzed by bis{[2-(4,5-diphenylimidazolyl)phenylimino]phenolate}cobalt(II) complexes

“…For example, upon activation with methylaluminoxane (MAO), CoCl 2 [12e14] and cobalt 2-ethylhexanoate [15] are stereoselective to produce cis-1,4-PBDs; however, the addition of alkylphosphines or pyridyl adducts will lead to the obvious increase of 1, [26,27] or various tridentate ligands [28e37]. Except for the above achievements, we also explored the welldefined cobalt complexes for the stereospecific polymerization of 1,3-butadiene, including dinuclear cobalt(II) complexes with [NOO e ] ligands [38], cobalt dichloride complexes with tridentate [NNO] ligands [39,40] and P-containing ligands [41,42]. In order to investigate the influence of ligand structures and different type of coordinated atoms on the catalytic activity and properties of PBDs, a new type of [NNO] ligands, {[2-(4,5-diphenyl-imidazolyl)phenylimino]methyl}phenols, has been designed and synthesized.…”

Capability of PN3-type Cobalt Complexes toward Selective (Co-)Polymerization of Myrcene, Butadiene, and Isoprene: Access to Biosourced Polymers

“…In (co)­polymerization of conjugated dienes, a cobalt-based system has unambiguously shown distinguished performances and received the earliest recognition in the academic and commercial production of cis -1,4 and 1,2-polybutadiene due to facile availability, high air and thermal stability of compound. Particularly, the versatility as well as tunable regio and stereoselectivity in polymerization of some substituted butadienes; − for example, the unique 1,2 stereospecificity toward butadiene ,,,,, as well as 3-methyl-1,3-pentadiene, affording semicrystalline to crystalline materials whose properties can be tuned by the catalyst formula as well as polymerization procedures . Nevertheless, cobalt has been less known for catalytic polymerization of isoprene and myrcene, ,, and the reason why subtle monomer difference causes large differences in reactivity and selectivity has not yet been explored.…”

Solvent Effect on the Morphology of Lamellar Nanocomposites Based on HIPS

“…It is also known that toluene is a better solvent than chloroform for butadiene. Since polymer-solvent interaction is important to obtain materials from solution casting method, it is reasonable to assume that a mixture of solvents should improve the solubility of this kind of polymer 5,6 . Based on these arguments, we were curious to look at the behavior of a 1:1 mixture of toluene and chloroform for the HIPS systems compared to chloroform alone.…”