5 years ago

Understanding Organometallic-Mediated Radical Polymerization with an Iron(II) Amine–Bis(phenolate)

Understanding Organometallic-Mediated Radical Polymerization with an Iron(II) Amine–Bis(phenolate)
Daniel L. Coward, Michael P. Shaver, Benjamin R. M. Lake
The organometallic-mediated radical polymerization (OMRP) of methyl methacrylate (MMA), styrene, and vinyl acetate, mediated by a novel tert-butyl-substituted amine–bis(phenolate) iron(II) complex in the absence of a halide source, accesses an organometallic-only route to controlled radical polymerization. Detailed kinetic and end-group studies were used to further understand the mechanism of control and the relative rates of propagation and termination reactions by using V-70, a low-temperature radical initiator. For the polymerization of MMA, propagation is favored at low conversions, with good control and reasonable dispersities achieved. Mechanistic studies suggest propagation proceeds through a RT-OMRP mechanism, while termination reactions become dominant at higher conversions. The polymerization temperature greatly affects the nature of termination, tuning whether bimolecular termination or catalytic chain transfer (CCT) dominates. With careful control of reaction conditions, the polymerization of styrene also shows good control, with dispersities as low as 1.27, and while not comparable to ATRP conditions, this research represents the most effective iron-mediated OMRP of styrene to date.

Publisher URL: http://dx.doi.org/10.1021/acs.organomet.7b00473

DOI: 10.1021/acs.organomet.7b00473

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.