3 years ago

Synthesis of Polyisobutylene Bottlebrush Polymers via Ring-Opening Metathesis Polymerization

Synthesis of Polyisobutylene Bottlebrush Polymers via Ring-Opening Metathesis Polymerization
Robson F. Storey, Brooks A. Abel, Bin Yang, Charles L. McCormick
Polyisobutylene (PIB)-based bottlebrush polymers were synthesized via ring-opening metathesis polymerization (ROMP) of norbornene- and oxanorbornene-terminated PIB macromonomers (MM) initiated by Grubbs third-generation catalyst ((H2IMes2)(pyr)2(Cl)2Ru═CHPh) (G3). While both MMs reached greater than 97% conversion as measured by 1H NMR, the rate of propagation of PIB norbornene was measured to be 2.9 times greater than that of PIB oxanorbornene MMs of similar molecular weight (MW). The slower rate of propagation of the oxanorbornene MM was attributed to interaction between the electron-rich oxygen bridge and the metal center of G3, which slowed but did not inhibit polymerization. Both types of MMs demonstrated controlled/“living” polymerization behavior, and brush polymers with MWs up to ∼700 kg/mol with narrow dispersity (Đ ≤ 1.04) were achieved.

Publisher URL: http://dx.doi.org/10.1021/acs.macromol.7b01655

DOI: 10.1021/acs.macromol.7b01655

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • 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.