Minimizing Star-Star Coupling in Cu(0)-Mediated Controlled Radical Polymerizations

Bas G.P. Van Ravensteijn, Raghida Bou Zerdan, Matthew E. Helgeson, Craig J. Hawker*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Conditions for the synthesis of star-shaped polymers via controlled radical polymerization (CRP) with minimized star-star coupling are presented. By systematically grafting a variety of polyacrylates (methyl acrylate, tert-butyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate) from cores carrying 4-8 initiating sites, it was found that traditional factors increasing star-star coupling, (i) the number of arms, (ii) the length of the arms, and (iii) the steric bulk of the monomer side-chain, could be controlled. This allows high monomer conversion (>95%) and low-dispersity polymers (D < 1.08) to be obtained for molecular weights up to ∼300 000 g mol-1. In addition to the suppression of coupling events, these improved reaction conditions maximize chain-end fidelity and permit the synthesis of well-defined (multi)block copolymer stars through in situ chain extension reactions. These advantages significantly broaden the synthetic scope and structural integrity for CRP-derived star polymers.

Original languageEnglish
Pages (from-to)601-609
Number of pages9
JournalMacromolecules
Volume52
Issue number2
DOIs
Publication statusPublished - 22 Jan 2019

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