Formation of Hydroxyapatite onto the Electron Beam Grafted PET Fabrics.

In a previous paper it was reported that poly(ethylene terephthalate) (PET) fabrics could be easily grafted with vinyl monomers by means of the proposed “film sealed method”. This film sealed method was applied to undergo an effective hydroxyaptite (HAp) formation on PET fabrics; first, carboxyl or phosphoric groups were introduced onto the original PET fabrics by the film sealed electron beam graft polymerization method, and then HAp layers were easily formed on such modified PET fabrics by dipping them in an aqueous solution of CaCl2 and then in an aqueous solution of Na2HPO4, alternately. The thickness of HAp increased by repeating the dipping process. On the other hand, the formation of HAp on the untreated PET fabrics and the diol groups introduced PET fabrics was hardly undertaken. From the X-ray diffraction it was found that the formed HAp possessed the crystalline structure, in which molecules are oriented mainly to the c-axis.