【摘要】 采用高级流变扩展系统对引入聚乙二醇(PEG)后的磷酸钙骨水泥(CPC)浆体的流变性能进行了考察,在固化液中引入不同相对分子质量的聚乙二醇可改善CPC的流变特性。采用稳态流变实验得到粘度曲线;采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,添加PEG后体系粘度增大、触变性增强、结构可恢复性变好。随着PEG浓度的增加(0.005≤w≤0.30),体系粘度增大,体系的触变性增强。综合评价后得出0.01≤wPEG≤0.10范围内对磷酸钙骨水泥混合体系的流变性能有较好的作用。更多还原

【Abstract】 The influence of polyethylene glycol(PEG) on the rheological characteristics of calcium phosphate bone cement(CPC) was investigated in this work with an advanced rheometric expansion system(ARES) rheometer. By adding the PEG of different molecular weights into the setting liquid, the rheological properties of CPC slurry could be improved obviously. The viscosity curves were obtained through 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 PEG do not change this property of CPC slurry. But due to the existence of PEG, the viscosity of CPC slurry and the area of thixotropic loop increase and the restorability is also improved. So the stability of CPC slurry is improved. With the increasing of PEG concentration(w=0.005~0.30), the viscosity and thixotropy of CPC slurry both increase and the restorability decreases. In this range, the rheological properties of CPC slurry are all improved.更多还原