Comparison of activities of homogeneous Ti-based catalysts in the presence of methylaluminoxane (MAO) for synthesis of syndiotactic polystyrene by UV/visible spectroscopic study

Addition of Lewis bases and acids. Effect on α-olefins polymerization with soluble metallocenes, 1 Ethylene

“…At the higher Al/Zr molar ratio Al/Zr = 8 400 (ethylene polymerization) a lower intensity is observed and a higher bathochromic shift of k max to 473 nm is observed. Kim and coworkers [18] found similar trends analyzing titanocene/MAO catalysts in toluene. At higher Al/Ti molar ratios the intensity of the titanocene band decreases.…”

“…TMA. Kim and coworkers [18] used this technique to study changes in the catalyst Titanocenes/MAO. They used the styrene polymerization as a reaction test.…”

Methylalumoxane – History, Production, Properties, and Applications

“…The catalyst‐to‐MAO ratio and their interactions can also influence the characteristics of the resulting polymer. For styrene polymerization, increasing the Al/Ti ratio led to a change in PDI, an increase in activity, and a decrease in the average M w 137. Also in propylene polymerization, raising the Al/Zr ratio results in a decrease in M w 138.…”

Reactivity of Metallocene Catalysts for Olefin Polymerization: Influence of Activator Nature and Structure

“…For instance, a change in MMD, along with an increase in activity, as well as a decrease in molar mass are observed with the system Ti(OC 4 H 9 ) 4 /MAO in the syndiotactic polymerization of styrene when the Al/Ti ratio is increased from 100 to 500. [88] In propylene homopolymerization as well as in propylene/1-hexene copolymerization with metallocene, an increase in the Al/Zr ratio from 200 to 5000 increases both activity and molar mass. However, the activity increase in copolymerization is higher than that for propylene homopolymerization.…”