Doxorubicin(DOX)-loaded poly(lactic acid)-poly(ethylene glycol)-poly(lactic acid)(PLA-PEG-PLA) microcapsules have been prepared by a double emulsion technique and characterized by dynamic laser light scattering,scanning electron microscopy(SEM) and confocal laser scanning microscopy(CLSM).

A series of poly(ethylene glycol)-poly(dl-lactide) (PEG-PLA) block copolymers with varying molecular weights were synthesized.

Influence of lactic acid configuration on synthesis of polylactic acid-polyethylene glycol via direct melt copolymerization;

In order to acquire biodegradable materials with good comprehensive performance, a series of polylactic acid-polyethylene glycol (PLEG) was synthesized with stannous oxide as catalyst via direct melt copolymerization of D,L -racemic lactic acid (D,L-LA) ais monomer with polyethylene glycol (PEG) having different number average relative molecular weight (Mn) at feed weight ratio of m(LA)/m(PEG)=9.

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.

The modified montmorillonite hybrids were obtained by intercalating Na+montmorillonite(Nmmt) and organ-montmorillonite(Ommt) with polyethylene glycol(PEG) and poly(L-lactic acid)-polyethylene glycol copolymer(PLA-PEG).