Logo JG-Universität MainzProf. Dr. Axel Müller


299. Xu, Y.; Bolisetty, S.; Drechsler, M.; Fang, B.; Yuan, J.; Ballauff, M.; Müller, A.H.E.: pH and Salt Responsive Poly(N,N-dimethylaminoethyl methacrylate) Cylindrical Brushes and their Quaternized Derivatives, Polymer 49, 3957–3964 (2008) -- DOI: 10.1016/j.polymer.2008.06.051 -- PDF
Stichworte: PDMAEMA, PMETAI, ATRP, polyelectrolytes, cylindrical polymer brushes, pH responsive, cryo-TEM, AFM, DLS

We present the synthesis and characterization of poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) cylindrical brushes, their pH responsiveness, and the corresponding quaternized analog, poly{[2-(methacryloyloxy)ethyl] trimethylammonium iodide} (PMETAI) brushes. PDMAEMA brushes were prepared by Atom Transfer Radical Polymerization (ATRP) using the grafting-from strategy. Initiating efficiencies of the ATRP processes were determined by cleaving the side-chains and gel permeation chromatography (GPC) analysis. Due to the slow initiation and steric hindrance, the initiating efficiency is only around 50%. The PDMAEMA brushes show worm-like structures and pH responsiveness, as proven by dynamic light scattering (DLS), atomic force microscopy (AFM), and cryogenic transmission electron microscopy (cryo-TEM) measurements. Strong cationic polyelectrolyte PMETAI brushes were produced by quaternization of the PDMAEMA brushes. AFM and cryo-TEM images showed similar worm-like morphologies for the PMETAI brushes. The PMETAI brushes collapsed in solution with high concentration of monovalent salt, as proven by DLS and AFM results.

Zu dieser Publikation gibt es weitere Dateien zum Download


Siehe auch:
  • Projekt: SFB 481 TP A12: Überstrukturbildung und Phasengleichgewichte in konzentrierten Lösungen von geladenen Sternpolymeren

powered by php + PostgreSQL - Letzte Änderung 24.08.2008- Impressum