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聚磷酸钙晶型与聚合度的调控

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Abstract:

聚磷酸钙(calciumpolyphosphate,CPP)是具有生物活性、可控生物降解性和适当力学性能的新型骨修复材料。以磷酸二氢钙粉末试剂为起始原料,通过热处理制备了不同晶型及聚合度的CPP,并探讨了热处理制度与晶型转变和聚合度的关系。用X射线衍射分析、热重–差示扫描量热分析、扫描电子显微镜、核磁共振分析等测试手段对制备的粉体的组成、性能及微观结构进行了研究。结果表明在室温~1000℃之间,CPP以3种晶型出现,分别为γ-CPP、β-CPP、α-CPP。聚合度的大小主要取决于在400℃附近保温时间的长短,CPP从150℃至1000℃,聚合反应一直在进行,直至形成无定型态,并熔化为玻璃。最佳的热处理工艺是400℃保温6h,然后800℃保温2h。

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