石墨烯/聚吡咯的添加对磷酸钙骨水泥结构与性能的影响

Effects of Adding Reduced-graphene Oxide/Polypyrrole Composites on the Structure and Properties of Calcium Phosphate Cement

自然骨具有压电效应,结合电刺激可以促进骨组织生长与修复,因此制备具有导电性人工骨材料尤为重要.本文通过在骨水泥(CPC)固相中添加不同含量的高导电率的还原氧化石墨烯(RGO)/聚吡咯(PPy)复合材料,研究不同含量RGO/PPy的添加对CPC结构与性能的影响.结果表明,添加RGO/PPy复合材料的CPC,其初凝时间和终凝时间都有所减小,但凝固时间均能满足临床使用要求.RGO/PPy的添加对CPC的物相组成没有影响,但对其抗压力学性能、微观形貌、导电性能的影响较大.其中,CPC的抗压力学性能随着RGO/PPy添加量的增加而减小,导电性随着RGO/PPy的添加量的增加而增大.

With the piezoelectricity of natural bone, electrical stimulation has been widely used in clinic for promoting bone growth and reconstruction. It has special meaning to prepare a conductive biomaterial for bone repair. In this paper, reduced-graphene oxide （RGO）/polypyrrole（PPy） composites with high conducity were added in the solid phase of calcium phosphate cement （ CPC ） and the effect of this addition on the structure and properties was investigated. The composites had great impact on physicochemical properties of CPC. The results showed that the setting time of CPC significantly decreases with RGO/PPy adding. It has great influence of adding RGO/PPy on the mechanical properties and conductivity of CPC, but no obvious effect on the phase composition of CPC. The conductivity of CPC gradually increases with the increase of RGO/PPy adding amount, and the compressive properties show opposite results with RGO/PPy addition. It has a dependent relationship between the adding amount of RGO/PPy and the conductivity and compressive mechanical properties.