摘要
以聚氨酯泡沫为多孔模板，α-磷酸钙骨水泥为浆料体系，将浸渍法和骨水泥自固化特性相结合，制备大孔尺寸为200～400μm、贯穿式微孔尺寸约为1μm的多孔磷酸钙复相陶瓷支架。研究了分散剂聚丙烯酸钠对羟基磷灰石成核、生长的影响，以及烧成温度与相组成的相关性。结果表明：浆料中分散剂聚丙烯酸钠对羟基磷灰石的成核有明显抑制作用；骨水泥水化反应过程中生成的针状、片状羟基磷灰石通过交联形成微孔结构，可避免干燥时裂纹的产生；经1200℃烧结的多孔陶瓷支架由羟基磷灰石、β-磷酸三钙和少量未水化完全的α-磷酸三钙组成。
Porous hydroxyapatite/β-calcium phosphate ceramic scaffolds with macropore sizes of 200-400 μm and micropore sizes of about 1 μm were prepared by coating porous polyurethane template with α- calcium phosphate bone cement （CPC） slurry, and its subsequent hydrolysis to calcium deficient hydroxyapatite （HA） during the self-setting processes is presented. The effects of sodium polyacrylate （NaPA） on the nucleation and growth of the HA crystals, and the relationship between the sintering temperature and phase constitution were studied. The results show that micropores formed by the flake-like or whiskerlike crystals of deficient HA in the CPC could prevent the formation of cracks during drying. The addition of NaPA could decrease the nucleation of HA crystals because of the steric effect. By firing the porous CPC samples at 1 200 ℃, the polyurethane foams burnt off and the CPC samples prepared at room temperature were converted into a sintered porous ceramic scaffold that was constituted of HA, β-tricalcium phosphate （β-TCP） and a small quantity of unhydrolyzed β-TCP.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2006年第3期324-328,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(30170954)资助项目。
关键词
磷酸钙骨水泥
自固化
多孔陶瓷支架
α-ricalcium phosphate bone cement
self-setting
porous ceramics scaffold
