Details

Autor(en) / Beteiligte

• Jones, Brad H
• Bachand, George D
• Shin, Sun Hae Ra
• Firestone, Millicent A
• Paxton, Walter F

Titel

Dynamic Control over Aqueous Poly(butadiene‑b‑ethylene oxide) Self-Assembly through Olefin Metathesis

Ist Teil von

• Macromolecules, 2018-09, Vol.51 (17), p.6543-6551

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We show that olefin metathesis can be used in an extremely simple process to rapidly alter the morphology of self-assembled poly­(butadiene-b-ethylene oxide) (PB–PEO) dispersions in situ. The addition of a water-insoluble Hoveyda–Grubbs catalyst to aqueous assemblies of PB–PEO leads to degradation of the hydrophobic PB block by well-established metathesis pathways and a concomitant change in the composition of the block copolymer. This phenomenon drives morphological transitions characterized by rapidly decreasing sizes of the self-assembled aggregates, the ultimate extent of which is readily controlled by catalyst concentration. Exemplary cases are presented in which transitions from worm-like micelles to spherical micelles or from vesicles to worm-like micelles can be accomplished within minutes.