Synthesis of Segmented Telechelomers by Ring Opening Polymerization and Polymer Modification.

摘要

Anionic polymerization and polymer modification coupled with step growth polymerization is being used to prepare segmented copolymers containing polyether and polyester segments having narrow molecular weight distributions for each segment. In this method on alkoxide initiator having a mask alcohol group initiates ethylene oxide polymerization. The resulting polyether alkoxide is modified with succinic anhydride to give a carboxylate anion which polymerizes pivalolactone. When the resulting microion is hydrolyzed selectively a telechelomer, poly(oxyethylene)-co-poly-(pivalolactone) containing hydroxy and carboxylic functionalities at its two ends, is formed. Synthesis of the telechelomer and the reaction intermediates will be discussed. NMR spectra and gel permeation chromatograms will also be presented to show that the products are pure have narrow molecular weight distributions. Keywords: Chelate compounds; Reprints. (AW)