Abstract: Poly (ethylene terephthalate)（PET）has good physical and chemical properties and has better application prospects as the medical polymer material. But the poor absorbency and biocompatibility of PET restrict the application in biomedical areas. So it is important to improve the biocompatibility of PET by surface modification. Firstly, this paper expounds the necessity of surface modification especially PET surface modification; then it states the development of acrylic acid used for modification of PET; furthermore, it discusses the surface modification of polyester by collagen based on biocompatibility. Finally, it points out the development prospects of the modified polyester.

Key words: collagen, acrylic acid, PET, modification treatment, biocompatibility