A Facile Route for Cyclic Polyelectrolyte Synthesis without Any Protection or Deprotection Process

摘要

Conventionally, protection and deprotection are required in the preparation of alkyne-terminated polymers. Herein, by tuning the feed molar ratio of catalyst to initiator or using proper solvent, well-defined alkyne-terminated poly(acrylic ester)s have been directly synthesized via atom transfer radical polymerization (ATRP), and the protection and deprotection are even avoided in this controlled polymerization process. After that, the terminal bromine is translated into azide group completely, and the obtained linear poly(acrylic ester) as PtBA is converted into cyclic PtBA by click reaction. Finally, cyclic poly(acrylic acid) (PAA) is prepared after hydrolysis of the cyclic PtBA, and it can be found that the desired cyclic polyelectrolyte actually exhibits quite different properties on conductivity and DSC compared with the linear one.