添加剂对磷酸钙骨水泥流变性能的影响Ⅰ.聚乙烯吡咯烷酮

Influence of Additives on Rheological Properties of Calcium Phosphate CementⅠ.Polyvinylpyrrolidone

采用高级流变扩展系统对磷酸钙骨水泥(CPC)浆体在聚乙烯吡咯烷酮(PVP)加入后的流变特性进行了考察。在固化液中添加不同K值的PVP可改善CPC的流变特性。采用稳态流动实验得出粘度曲线,用滞后环面积评价法考察CPC浆体的触变性。结果表明:CPC是一种剪切变稀的浓悬浮体,PVP添加后体系粘度增大、触变性增强;随着PVP含量的增加(wK30=0.01～0.20,wK90=0.002～0.04),体系粘度增大,滞后环面积也增加,体系的触变性增强。综合评价后得出结论:当wK30=0.20或wK90=0.04时体系的各项流变性能均较好。

The influence of polyvinylpyrrolidone (PVP) on the rheological characteristics of calcium phosphate cement (CPC) was investigated with an advanced rheometric expansion system rheometer. By the addition of PVP of different K values into the setting liquid, the rheological properties of CPC slurry could be improved. The viscosity curves were obtained by steady transient test to evaluate the characters of flowage and the thixotropic properties were measured by the thixotropic loop test. The results show that the CPC slurry is a typical shear-thinning fluid and the addition of PVP does not change this property of CPC slurry. But due to the existence of PVP, the viscosity of CPC slurry and the area of thixotropic loop both increase and the restorability is also improved. So the stability of CPC slurry is improved. With the increasing of PVP concentration (w_(K30)=0.01~0.20,w_(K90)=0.002~0.04), the viscosity and thixotropy of CPC slurry both increase and the restorability decreases. In conclusion, when w_(K90)=0.04 or w_(K30)=(0.20,) the PEG solution are more suitable for the CPC as an injectable material. The rheological properties of CPC slurry are all improved.