Polyethylene Building Blocks by Catalyzed Chain Growth and Efficient End Functionalization Strategies, Including Click Chemistry

Abstract

A means to an end: Polyethylene chains obtained by catalyzed chain growth on magnesium and exhibiting molar masses up to 5000 g mol−1 have been end‐functionalized in high yield with iodide, azide, and amine reactive end groups (see scheme). The functionalized polyethylenes can be used to generate a range of reactive polyolefins; for example, the azide‐functionalized chain can undergo “click” reactions to afford macromonomers.

Catalytic activity of phenyl substituted cyclopentadienyl neodymium complexes in the ethylene oligomerization process

“…However, this problem has been successfully solved for oligo-and polyethylene with a terminal functional group being a good reactive site for versatile applications. One of possible solutions to the mentioned problem can be achieved by applying neodymium cyclopentadienyl complexes as pre-catalysts along with Alkyl 2 Mg on a stage of catalytic ethylene polymerization followed by replacing the Mg atom at the end of polyethylene chain with a functional group [4][5][6].…”

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).…”

Hairy Core–Shell Nanoparticles via RAFT: Where are the Opportunities and Where are the Problems and Challenges?

“…The RAFT process can easily be adapted by covalently attaching the RAFT agent to endfunctional polymers such as poly(ethyleneoxide), [24,[28][29][30][31][32][33][34][35][36] kraton, [37] polyethylene [38][39][40] and poly(dimethylsiloxane). [41] In these cases, the RAFT agent was reacted with the already existing polymer.…”