This article reviews the methods of modifying polyaniline with alkyl and aryl and preparing block and graft polyaniline copolymers, and briefly summarizes application potential of polyaniline.

The polymers had good applied prospects in synthesizing block copolymers, coating, slow releasing agent for medicine, etc.

Syntheses and properties of PLA-PEG block copolymers were introduced, and their applications for micelles, microspheres and nanoparticles in drug delivery system were also reviewed.