Post‐Metallocenes in the Industrial Production of Polyolefins

Abstract

Research on “post‐metallocene” polymerization catalysis ranges methodologically from fundamental mechanistic studies of polymerization reactions over catalyst design to material properties of the polyolefins prepared. A common goal of these studies is the creation of practically useful new polyolefin materials or polymerization processes. This Review gives a comprehensive overview of post‐metallocene polymerization catalysts that have been put into practice. The decisive properties for this success of a given catalyst structure are delineated.

Thermoplastic polyester elastomers based on long-chain crystallizable aliphatic hard segments

“…However, TPEs can also be generated by chain growth polymerization in a single step as illustrated by multiblock copolymers obtained via chain-shuttling ethylene/1-olefin insertion polymerizations. 5,6 TPEs are also accessible via classical step-growth polymerization of difunctional monomers. For example, thermoplastic polyester elastomers consisting of amorphous poly(tetramethylene glycol) soft phases and crystalline poly(butylene terephthalate) hard segments are applied widely.…”

Controlled Radical Polymerization of Ethylene Using Organotellurium Compounds

“…[1][2][3][4] Potentially,t he macromolecular engineering of PE through the control of its primary structure (that is,c haracteristics such as average molar mass,m olarmass distribution (MMD), [5][6][7][8] branching density,a nd the introduction of functional groups [9][10][11][12][13] )isexpected to fabricate new polyolefin-based high value-added materials.T he development of new catalysts for coordination polymerizations led to significant advances for high-density PE synthesis,enabling living polymerizations,end-group functionalities,and copolymerization with polar monomers.I nc ontrast, similar advances for low-density PE remain aformidable challenge,despite the continuous developments in the field of controlled radical polymerizations (CRPs,o rr eversible-deactivation radical polymerizations,RDRPs).…”

UHMWPE/HDPE in-reactor blends, prepared by in situ polymerization: Synthetic aspects and characterization

“…Thus, two sets of polyethylene blends, containing ~10 and 5 wt% of SBA-15 were synthesized. Due to the living nature of the FI catalyst [24][25][26][27], when changing the polymerization time, the effect of the different molar masses in the properties of the materials can also be evaluated. The results obtained for the UHMWPE/HDPE blends together with the ones for the neat polymers and the nanocomposites, prepared with each one of the two individual catalysts, are summarized in Table 1.…”