正硅酸四乙酯[Si(OC2H5)4,TEOS]、磷酸三乙酯[PO(OC2H5)3,TEP]和四水硝酸钙[Ca(NO3)2·4H2O]为前驱体,用溶胶-凝胶法分别制备了含有P2O5和不含P2O5的两种CaO-P2O5-SiO2系统生物活性玻璃.对凝胶采用TG—DTA技术研究了从凝胶到玻璃转变过程的热行为,探讨了其热反应机理,并通过玻璃的体外实验(in vitro)研究其生物活性.结果显示CaO-SiO2组成中加入P2O5热行为发生变化:300-420℃之间TEP的酯类基团氧化分解,570℃左右磷离子脱去残余的羟基.P2O5的引入导致玻璃表面形成的羟基磷灰石的晶体颗粒增大,结晶程度提高,改善了玻璃的生物活性.
Two bioactive glasses in the system CaO-P2O5-SiO2 were prepared by sol-gel process, from tetraethylorthosilicate
(TEOS), triethylphosphate (TEP) and hydrated calcium nitrate (one with P2O5 and the other P2O5 free). Thermal behavior and reaction mechanism of
xerogels were analyzed by TG-DTA methods. The in~ vitro bioactivity of both glasses was assessed by soaking them in simulated body fluid. The results
reveal that the presence of P2O5 in the glass composition gives rise to the change of thermal behavior: the organic groups of triethyl phosphate are
decomposed in the temperature range 300--420℃ and the residual OH groups are removed at 570℃ or so. The crystal of hydroxyl carbonate
apatite formed on the surface of the glass containing P2O5 is larger and, relatively, the bioactivity is improved.
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