Effects of self-assembly on diffusion mechanisms of triblock copolymers in aqueous solution.
Molecular dynamics of self-assembling triblock copolymers in a mixture with water was explored using nuclear magnetic resonance (NMR) diffusometry with high-intensity field gradient pulses. With varying concentration, the diffusivities are found to cover 4 orders of magnitude. The dramatic changes in both the rates and patterns of polymer propagation can be attributed to their ordering in supermolecular formations and prove to be a sensitive means for probing structural and dynamic features of self-aggregation which only now, owing to recent progress in NMR diffusometry, have become accessible to direct observation.
Ulrich
Konstantin
K
Universität Leipzig, Institut für Experimentelle Physik I, Linnéstr. 5, 04103 Leipzig, Germany.
Galvosas
Petrik
P
Kärger
Jörg
J
Grinberg
Farida
F
D004058:Diffusion; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008823:Micelles; D008956:Models, Chemical; D011092:Polyethylene Glycols / Q000737:chemistry*; D011409:Propylene Glycols / Q000737:chemistry*; D012996:Solutions; D014867:Water / Q000737:chemistry*
D008823:Micelles; C116176:PEO-PPO-PEO; D011409:Propylene Glycols; D012996:Solutions; D014867:Water; D011092:Polyethylene Glycols