聚磷酸钙纤维增强增韧磷酸钙骨水泥的力学效应

目的:制备α-磷酸三钙/聚磷酸钙纤维复合材料,探讨聚磷酸钙纤维增强磷酸钙骨水泥的可行性.方法:首先利用沉淀法合成出α-磷酸三钙粉末,然后将其与不同质量比、不同长度聚磷酸钙纤维混合,最后用固化液调和制得骨水泥.对样品进行凝固时间、力学性能测试,利用扫描电镜观察固化体微观结构.结果:当聚磷酸钙纤维的含量为10%、长度为2 mm时,复合材料抗压强度达到62.5 MPa,抗折强度达到12.4 MPa.扫描电镜显示适量的聚磷酸钙纤维在骨水泥基体中分布均匀,与基体结合性好.在Ringer溶液中浸泡2个月后,纤维未发生明显的降解作用,仍具有一定的增强增韧效果.结论:聚磷酸钙纤维在一定程度上可对骨水泥起到增强作用.α-磷酸三钙/聚磷酸钙纤维复合材料具有良好的力学特性.

Mechanical effect of calcium polyphosphate fiber on reinforcing calcium phosphate bone cement composites

AIM: To prepare α-tricalcium phosphate (α-TCP)/calcium polyphosphate (CPP) fiber and to study the feasibility of CPP fiber to reinforce calcium phosphate bone cement composites. METHODS: Firstly,α-TCP powder was synthesized using chemical sediment method. Secondly, the α-TCP was mixed with CPP fiber according to different contents and lengths. Finally, bone cement was tempered with firming agent. Solidification time and mechanical property of the samples were measured. Microstructure of hardened sample was observed with scanning electron microscope. RESULTS: When the amount of CPP fibers was 10% and the length was 2 mm, the compressive strength reached 62.5 MPa and the rupture strength reached 12.4 MPa. Scanning electron microscope suggested that CPP fibers with great associativity were well distributed in bone cement. After immersing in Ringer fluid for two months, the CPP fibers did not biodegrade obviously and still had certain function to increase strength and toughness. CONCLUSION: To a certain extent, the CPP fiber can increase strength and toughness of bone cement. Furthermore, α-TCP/CPP composites have good mechanical properties and biocompatibility.