SYNTHESIS AND CHARACTERIZATION OF NARROW MOLECULAR WEIGHT DISTRIBUTION POLY(SULFOPROPYLBETAINE) BLOCK COPOLYMERS

摘要

Poly(sulfopropylbetaine) block copolymers with narrow molecular weight distributions have been synthesized for the first time. Group transfer polymerization (GTP) of 2-(dimethylamino)ethyl metiiacrylate with various alkyl niethacrylates (PDMAEMA-Woci-PAlkylMA) yields well-defined, near-mooodisperse precursor block copolymers. Subsequent betainization. with 1,3-propanesultone under mild conditions leads to hydrophilic-hydrophobic, sulfopropylbetaine block copolymers. The behavior of these betaine block copolyraers has been studied with respect to their adsorption/aggregation behavior in both aqueous and salt solution using surface tensiometry, dynamic light scattering (DLS) and aqueous gel permeation chromatography (AGPC).