（Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China）
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DOI:
10.7502/j.issn.1674-3962.2012.09.01
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Abstract:
The influence of additives on the rheological properties of injectable calcium phosphate cement (ICPC) was investigated with an advanced expansion system rheometer. During the measurement of steady rheological properties, the viscosity, shear stress, and thixotropy were detected. During dynamic oscillation testing, the viscoelastic response of the ICPC under forced oscillation and the internal structure were unvailled. The results indicated that the ICPC showed both plastic and thixotropic behavior with little effect by additives. The introduction of these water soluble polymers improved the viscosity and thixotropy of the ICPC, which are conducive to the stability of the whole system. These additives improve the recoverability and stability of the ICPC network after being sheared, in which xanthan gum and chitosan were the most obvious. On this basis, the time to form a gel was assessed to be in the range of 2 563~2 600 s for xanthan gumICPC system. In addition, with the increasing of xanthan gum contents, the thixotropic loop area of ICPC enlarged, but the formation of network structure was not stable under high shear condition.