Syndiotactic polystyrene catalysts and polymerization

Novel cycloaurated gold(III) complexes and their effects on styrene polymerization

“…When gold complexes added to the reaction media s-PS was formed ( Fig. 2; Table 1; run nos., [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] After these results were evaluated, series of experiments were conducted at room temperature with different solvents and results. Bulk polymerization was carried out at different catalyst concentrations but conversion did not pass 25% yield.…”

“…In automotive systems, s-PS can be applied in power distribution centers under the hood, in electrical lighting, and electronics, s-PS can be used successfully for connectors, plugs and sockets, glass-fiber-reinforced and color-stabilized s-PS grades are materials for iron skirts and at least very promising markets of s-PS are food and water contact applications [17]. Especially half-metallocene transition metal complexes are very effective catalysts to synthesize s-PS [18,19]. Although, gold complexes used for a wide array of transformations, there are few reports on the usage of gold complexes for polymerization reactions.…”

Syndiotactic polystyrene: Process and applications

“…The most effective catalysts are half-sandwich metallocenes based on titanium as the transition metal and substituted cyclopentadienyl and analogous ligands. 4 If necessary, further aluminum alkyls can be added to the premix to increase the polymerization rate or to control the molecular weight of the polymers.…”

“…1,2 Since that time, such polymers as well as the polymerization reactions catalyzed by these transition metal complexes have been investigated in great detail. 3,4 Because of the broad availability of styrene as a monomer, syndiotactic polystyrene has gained much interest and shows a lot of advantageous properties as a new engineering thermoplastic. Such properties are:…”

Catalytic 1,3‐Cyclohexadiene Homopolymerization and Regioselective Copolymerization with Ethylene

“…[1] As a function of defined coordination complex structure of metallocene and post-metallocene catalysts it is possible to tailor new polymer architectures based upon ethylene, propylene, styrene and norbornene. [2][3][4] Ethylene/cycloolefin copolymers are prepared either by single-site catalysts or by means of catalytic hydrogenation of homo-and copolymers, prepared by ring opening metathesis polymerization (ROMP). [4,5] In addition to norbornene and other multicyclic olefin monomers [4,6] also cyclopentene [7] was applied successfully to prepare cycloolefin copolymers (COC).…”