アルギン酸ナトリウムを用いた繊維状水酸アパタイトの合成

Abstract

In this paper, fibrous hydroxyapatite (HAp), which is expected to be used as an implant material to periodontal bone defects, was prepared by using sodium alginate (Na-Alg.).The starting materials were prepared by dissolving Na4P2O7 into 5% Na-Alg. solution; Na-Alg./Na4P2O7 (weight ratio)=2.4, 2.6, 2.8, 3.0, 3.2, while the mixed solution of 0.15mol Ca(CH3COO)2 and 0.1mol CaCl2 was used as the spinning solution; pH=6.0, 6.5, 7.0, 7.5.The starting materials were spun through a nozzel of 0.1φmm into the spinning solution in a vessel of 16ml capacity. Gelatinous fibers obtained were aged, dried and calcined at 900°C for 1 hour. The thermal transformation of the calcined fibers and their compositions were examined by using X-ray diffraction, DTA, and chemical analysis. From these results, the optimum condition for preparing fibrous HAp was found to be as follows; Na-Alg./Na4P2O7=3.0, pH=6.5.In order to remove pores appearing during the heating process, the dried fibers formed under the optimum condition were heat-treated under reduced pressure (at 133Pa and 900°C for 3 hours). The resulting HAp fibers were about 30-40μm in diameter. It was also confirmed that the HAp phase in the fibers was maintained even after heat-treated at 1300°C for 1 hour in air.