尿素共沉淀法制备纤维状羟基磷灰石/壳聚糖复合粉料

尿素共沉淀法制备纤维状羟基磷灰石/壳聚糖复合粉料;壳聚糖; 羟基磷酸钙; 尿素共沉淀

Preparation of a Fibrous Hydroxyapatite(HAP)/Chitosan Composite Powder by Urea Coprecipitation

The composite powder of fibrous hydroxyapatite(HAP)/amorphous chitosan(CS) was prepared by the homogeneous coprecipitation with urea as the precipitant and characterised by XRD, SEM, IR and chemical composition ( n (Ca)/ n (P)). The n (Ca)/ n (P) and phase structure of the powder were found to be affected by the pH value of the system during coprecipitation with urea. The inorganic phase of the composite powder predominately consisted of hydroxyapatite when its n (Ca)/ n (P) was 1 64, the urea concentration was 1 0 mol/L and the pH value of system was 7 2. The inorganic phase of the composite powder in part is consisted of calcium phosphate dibasic(DCPA) when its n (Ca)/ n (P) was 1 42, the urea concenration was 0 5 mol/L and the pH value of system was 6 1. Compared with mechanically mixed HAP/CS powders, the composite powders had new wave peaks at 1 654 cm -1 and 1 560 cm -1 in the IR spectrum.