Rigid-to-Flexible Transition in a Molecular Brush in a Good Solvent at a Semidilute Concentration.
Langmuir
; 38(17): 5226-5236, 2022 05 03.
Article
em En
| MEDLINE
| ID: mdl-35166545
ABSTRACT
The structures of a molecular brush in a good solvent are investigated using synchrotron small-angle X-ray scattering in a wide range of concentrations. The brush under study, PiPOx239-g-PnPrOx14, features a relatively long poly(2-isopropenyl-2-oxazoline) (PiPOx) backbone and short poly(2-n-propyl-2-oxazoline) (PnPrOx) side chains. As a solvent, ethanol is used. By model fitting, the overall size and the persistence length as well as the interaction length and interaction strength are determined. At this, the interplay between form and structure factor is taken into account. The conformation of the molecular brush is traced upon increasing the solution concentration, and a rigid-to-flexible transition is found near the overlap concentration. Finally, the results of computer simulations of the molecular brush solutions confirm the experimental results.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Solventes
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Langmuir
Ano de publicação:
2022
Tipo de documento:
Article