SYNTHESIS OF NANOSPHERICAL AND ULTRALONG FIBROUS HYDROXYAPATITE AND REINFORCEMENT OF BIODEGRADABLE CHITOSAN/HYDROXYAPATITE COMPOSITE

摘要

Morphologies of hydroxyapatite (HAp) powders have influence on the mechanical properties of HAp/polymer composites. In this paper we reported a synthetic route for nanospherical and ultralong fibrous HAp powders and compared the infiuence of HAp morphologies on composite mechanical properties. HAp flbers with the length of ～250 μm along c-axis direction and nanospheres with the diameter of ～80 nm were produced, respectively, in the acidic solution containing glutamic acid and in the al- kaline solution containing polyacrylic acid. The ultralong HAp flbers synthesized were used to reinforce biodegradable chitosan biomaterials with the signifcant improvement of bending strength because of the pull-out efiect of long flbers.